Certified Dental Coder (CDC) Exam — Questions and Answers

Question 1: Why are CPT codes important in dental practice?

They help with patient scheduling
They help dentists identify symptoms and diagnosis
They classify medical conditions and diagnoses
They help with billing for procedures and medical services (Correct answer)

Correct answer: They help with billing for procedures and medical services

CPT codes are important in dental practice for billing procedures and medical services that may be covered by medical insurance. This applies to services that cross over into the medical realm, such as certain oral surgeries or treatments for medical conditions with oral manifestations. They ensure accurate reporting and appropriate reimbursement for these specific services.

Question 2: A dental consultant suspects that a dentist is submitting inflated procedure codes to maximize reimbursement. This practice is best defined as:

Downcoding
Unbundling
Upcoding (Correct answer)
Bundling

Correct answer: Upcoding

Upcoding is the fraudulent practice of billing for a more expensive procedure than was actually performed.

Question 3: A dental practice wants to verify that its sterilizer is functioning properly after a mechanical failure was repaired. Which test should be performed BEFORE returning the sterilizer to routine use?

One Bowie-Dick test cycle only
A mechanical parameter printout review only
One chemical indicator test cycle
Three consecutive biological indicator test cycles with negative results (Correct answer)

Correct answer: Three consecutive biological indicator test cycles with negative results

After sterilizer malfunction or repair, CDC recommends running three consecutive biological indicator cycles without any processed load before returning the sterilizer to service.

Question 4: Which of the following best describes 'unbundling' in dental coding compliance?

Submitting claims to two insurers simultaneously for the same service
Billing separately for procedures that should be reported with one comprehensive code (Correct answer)
Using a higher-level code than the service actually performed
Combining multiple procedure codes into a single comprehensive code

Correct answer: Billing separately for procedures that should be reported with one comprehensive code

Unbundling means reporting individual component procedures with separate codes when a single comprehensive CDT code exists that covers all components, inflating reimbursement.

Question 5: Which CDT code is reported for periodontal maintenance following the completion of active periodontal therapy?

D4341
D1110
D4910 (Correct answer)
D4355

Correct answer: D4910

D4910 (periodontal maintenance) is used after a patient has completed active periodontal therapy to maintain periodontal health, and is distinct from routine prophylaxis.

Question 6: What is the maximum safe daily dose of acetaminophen for a healthy adult patient to avoid hepatotoxicity?

3,000 mg
2,000 mg
4,000 mg (Correct answer)
6,000 mg

Correct answer: 4,000 mg

The FDA recommends a maximum daily dose of 4,000 mg acetaminophen for healthy adults, though 3,000 mg is preferred for elderly or at-risk patients.

Question 7: What is a 'primary insurance' in dental billing?

The first insurance to pay for dental services (Correct answer)
The insurance that covers all dental services
The insurance that covers emergency dental care
The insurance that only pays for preventative services

Correct answer: The first insurance to pay for dental services

In situations where a patient has more than one dental insurance plan, the primary insurance is the one that pays first. Coordination of benefits rules determine which plan is primary and which is secondary, ensuring that the patient receives the maximum benefit without overpayment. Identifying the primary insurance correctly is essential for accurate billing and claim submission.

Question 8: When a dental plan uses a 'least expensive alternative treatment' (LEAT) policy, ethical application requires that the consultant:

Apply LEAT retroactively without informing the patient beforehand
Automatically deny more expensive treatments without explanation
Clearly communicate the policy to enrollees before treatment so they can make informed choices (Correct answer)
Allow only the least expensive treatment option to be performed

Correct answer: Clearly communicate the policy to enrollees before treatment so they can make informed choices

Ethical LEAT application requires proactive disclosure so patients can make informed financial and clinical decisions before treatment begins.

Question 9: Bitewing radiographic images — two images — should be reported using which CDT code?

D0272 (Correct answer)
D0274
D0270
D0277

Correct answer: D0272

D0272 is the CDT code for bitewing radiographic images consisting of two images.

Question 10: What is the reversal agent for benzodiazepine-induced respiratory depression in dental sedation emergencies?

Atropine
Naloxone
Epinephrine
Flumazenil (Correct answer)

Correct answer: Flumazenil

Flumazenil is a competitive benzodiazepine receptor antagonist that rapidly reverses sedation and respiratory depression caused by benzodiazepines.

Question 11: When a patient has Medicaid as their secondary insurance and a private plan as primary, the dental coder should:

Submit to the private plan first; submit the EOB with the Medicaid claim as secondary (Correct answer)
Submit only to Medicaid since it is a government payer
Collect the full balance from the patient before billing either plan
Bill Medicaid for the full amount and ignore the private plan

Correct answer: Submit to the private plan first; submit the EOB with the Medicaid claim as secondary

Medicaid is almost always payer of last resort; the claim must go to the primary private insurer first, and the resulting EOB is submitted with the Medicaid claim.

Question 12: According to the CDC, which category of patients is most likely to require special dental infection control considerations related to prion diseases (e.g., Creutzfeldt-Jakob disease)?

Patients who have undergone organ transplantation
Patients who received dura mater or pituitary-derived growth hormone grafts before 1987 (Correct answer)
Patients with active hepatitis C infection
Patients with known HIV infection

Correct answer: Patients who received dura mater or pituitary-derived growth hormone grafts before 1987

Recipients of dura mater grafts or cadaveric pituitary-derived hormones before 1987 are considered at elevated risk for iatrogenic CJD and warrant special instrument handling protocols.

Question 13: What is informed consent in CDC professional practice?

Verbal agreement only
Having clients sign without explanation
Third-party consent
Providing complete information about services, risks, and alternatives for voluntary decisions (Correct answer)

Correct answer: Providing complete information about services, risks, and alternatives for voluntary decisions

Informed consent requires clear, complete information about proposed services, risks, outcomes, and alternatives so clients can make knowledgeable decisions.

Question 14: A treatment plan includes multiple restorations on the same tooth: an existing MOD composite and a proposed DO amalgam on tooth #30. Which review issue does this most likely present?

Overlapping surface restorations may indicate tooth preparation consolidation that should be reviewed for a single crown (Correct answer)
The proposed amalgam should be denied because the composite is newer
The plan should automatically approve both restorations
Tooth #30 has too many surfaces to be restored

Correct answer: Overlapping surface restorations may indicate tooth preparation consolidation that should be reviewed for a single crown

Multiple restorations covering most of a posterior tooth's surfaces may indicate that a single crown is clinically more appropriate than separate restorations.

Question 15: Which of the following is the most appropriate action when a dental consultant is unsure whether a procedure meets medical necessity criteria?

Request additional clinical documentation or seek peer consultation (Correct answer)
Automatically approve the claim to avoid provider complaints
Automatically deny the claim to minimize payout risk
Make a decision based on the dentist's fee history

Correct answer: Request additional clinical documentation or seek peer consultation

When uncertain, requesting additional documentation or peer consultation ensures an evidence-based, ethical determination.

Question 16: Which anatomical landmark is the junction between the enamel and cementum on a tooth?

Periodontal junction
Dentinoenamel junction (DEJ)
Cementoenamel junction (CEJ) (Correct answer)
Amelodentinal junction

Correct answer: Cementoenamel junction (CEJ)

The cementoenamel junction (CEJ) is where enamel of the crown meets cementum of the root.

Question 17: What is scope creep in CDC project management?

Uncontrolled scope expansion without adjusting time, cost, or resources (Correct answer)
Reducing deliverables
Incremental feature addition technique
Natural planned growth

Correct answer: Uncontrolled scope expansion without adjusting time, cost, or resources

Scope creep adds requirements without formal evaluation, causing schedule delays and budget overruns.

Question 18: What is 'gemination' in dental terminology?

The fusion of two separate tooth buds into one tooth
The presence of an extra root on a tooth
An attempt by a single tooth bud to divide, resulting in a tooth with two crowns and one root (Correct answer)
Abnormal calcification within the crown

Correct answer: An attempt by a single tooth bud to divide, resulting in a tooth with two crowns and one root

Gemination is when a single tooth bud attempts to split, producing a tooth with two crowns (or a large bifid crown) sharing a single root and pulp.

Question 19: When using chemical liquid sterilants (cold sterilization) for heat-sensitive dental instruments, which condition is CRITICAL for achieving sterilization?

Rinsing instruments with tap water immediately after immersion
Room temperature of at least 68°F
Submersion for the full contact time specified on the label (Correct answer)
Use of a diluted solution to protect instrument integrity

Correct answer: Submersion for the full contact time specified on the label

Full immersion for the complete contact time specified by the EPA-registered product label is essential to achieve sterilization with liquid chemical sterilants.

Question 20: A dental plan uses a 'missing tooth clause.' A member requests a bridge to replace tooth #19, which was extracted before the member's enrollment. How should the consultant handle this?

Deny the bridge benefit due to the missing tooth clause (Correct answer)
Approve the bridge since the member has current coverage
Approve partial benefit based on years of coverage
Request records from the previous insurer before deciding

Correct answer: Deny the bridge benefit due to the missing tooth clause

The missing tooth clause excludes benefits for replacement of teeth lost prior to effective coverage date.

Question 21: Which EPA registration category indicates a chemical disinfectant is effective against Mycobacterium tuberculosis and can be used as an intermediate-level disinfectant in dentistry?

Fungicidal
Sporicidal
Sanitizer
Tuberculocidal (Correct answer)

Correct answer: Tuberculocidal

Tuberculocidal disinfectants are classified as intermediate-level agents and are appropriate for semi-critical dental surfaces.

Question 22: What is 'Stensen's duct' in dental anatomy?

The duct of the parotid salivary gland opening near the maxillary second molar (Correct answer)
The duct of the sublingual gland
The duct of the submandibular salivary gland
A minor salivary gland duct in the palate

Correct answer: The duct of the parotid salivary gland opening near the maxillary second molar

Stensen's duct (parotid duct) carries saliva from the parotid gland, emptying into the oral cavity opposite the maxillary second molar.

Question 23: What is the primary function of the root canal in a tooth?

To house nerves and blood vessels, nourishing the tooth (Correct answer)
To protect the tooth from decay
To form the enamel on the tooth
To anchor the tooth in the jawbone

Correct answer: To house nerves and blood vessels, nourishing the tooth

The root canal is the innermost part of the tooth's root, containing the dental pulp. This pulp is a vital tissue composed of nerves, blood vessels, and connective tissue. Its primary function is to nourish the tooth and provide sensory perception, keeping the tooth alive and responsive to stimuli.

Question 24: What differentiates active from inactive records in CDC?

Inactive have no value
Active are regularly referenced; inactive are retained but rarely accessed (Correct answer)
Active are digital; inactive are paper
Active are public; inactive are private

Correct answer: Active are regularly referenced; inactive are retained but rarely accessed

Active records are frequently referenced; inactive ones are retained for legal or historical purposes but rarely needed.

Question 25: A patient's plan pays 80% after the deductible for basic services. The allowed fee for a restoration is $200 and the annual deductible of $50 has not been met. How much does insurance pay?

$80
$160
$120 (Correct answer)
$150

Correct answer: $120

After applying the $50 deductible, the remaining $150 is subject to 80% coverage: $150 × 0.80 = $120.

Question 26: What information is required in Box 35 of the ADA Dental Claim Form?

Patient's date of birth
Treating dentist's NPI number
Remarks or special conditions (Correct answer)
Place of treatment code

Correct answer: Remarks or special conditions

Box 35 of the ADA Dental Claim Form is reserved for remarks, special notes, or conditions relevant to the claim.

Question 27: A patient with renal impairment requires antibiotic therapy for a dental abscess. Which antibiotic requires the MOST significant dose adjustment in kidney disease?

Clindamycin
Metronidazole
Azithromycin
Amoxicillin-clavulanate (Correct answer)

Correct answer: Amoxicillin-clavulanate

Amoxicillin-clavulanate is primarily renally excreted, and dose intervals must be extended significantly in patients with reduced GFR to prevent accumulation.

Question 28: A patient with a documented penicillin allergy is prescribed amoxicillin by a locum dentist. What risk management failure does this represent?

Non-compliance with OSHA standards
Improper informed consent documentation
Inadequate sterilization protocol
Failure to review the patient's medical history and allergy alerts (Correct answer)

Correct answer: Failure to review the patient's medical history and allergy alerts

Prescribing a penicillin-class antibiotic to an allergic patient indicates the prescriber failed to review the patient's documented allergy history.

Question 29: Vestibuloplasty — ridge extension, secondary epithelialization — is reported with which CDT code?

D7320
D7340
D7310
D7350 (Correct answer)

Correct answer: D7350

D7350 is the CDT code for vestibuloplasty, a procedure to increase the depth of the oral vestibule for prosthetic purposes.

Question 30: When performing an extraoral assessment, which lymph node chain is palpated first to systematically screen for head and neck pathology?

Submental nodes
Preauricular nodes
Submandibular nodes (Correct answer)
Posterior cervical nodes

Correct answer: Submandibular nodes

A systematic extraoral exam typically begins with the preauricular nodes or follows a consistent pattern; submandibular nodes drain much of the oral cavity and are a key early checkpoint.

Question 31: How should dental coders handle situations where a patient’s insurance is not covered?

Inform the patient and suggest alternative options (Correct answer)
Charge the patient more to cover the costs
Ignore the issue and continue the treatment
Provide treatment without billing insurance

Correct answer: Inform the patient and suggest alternative options

When a patient's insurance does not cover a service, the dental coder has an ethical and professional responsibility to inform the patient promptly and clearly. This allows the patient to understand their financial obligations before treatment proceeds. The coder should also be prepared to discuss alternative payment options, such as payment plans or self-pay discounts, to help the patient access necessary care.

Question 32: Why is regular review important in CDC risk management?

Only needed after incidents
Assessments stay valid forever
Prohibited more than annually
Conditions change and new risks emerge requiring updates (Correct answer)

Correct answer: Conditions change and new risks emerge requiring updates

Regular reviews ensure assessments remain current as conditions change and lessons from incidents are incorporated.

Question 33: A claim is rejected as a 'duplicate.' The coder should first:

Immediately resubmit the claim with a new date of service
Change the procedure code and resubmit
Verify whether the original claim was already paid, pending, or denied before taking further action (Correct answer)
Write off the balance as a billing error

Correct answer: Verify whether the original claim was already paid, pending, or denied before taking further action

Before resubmitting a 'duplicate' claim, the coder must check the status of the original claim to avoid overpayment or creating a genuine duplicate.

Question 34: Why is accurate documentation important in CDC?

No impact on quality
Only for bureaucratic purposes
Only for medical/legal fields
It supports decision-making, compliance, and legal defensibility (Correct answer)

Correct answer: It supports decision-making, compliance, and legal defensibility

Accurate documentation supports quality assurance, compliance, legal defensibility, and knowledge continuity.

Question 35: Which CDT code is used to report a complete series of periapical and bitewing radiographic images (full mouth series)?

D0220
D0210 (Correct answer)
D0340
D0330

Correct answer: D0210

D0210 is the CDT code for a full mouth series of radiographic images, including periapical and bitewing images.

Question 36: The dental consultant is reviewing a clinic's sterilization records. How often should biological indicator (spore) testing be performed at minimum for routine steam sterilizers?

Monthly
Quarterly
Daily
Weekly (Correct answer)

Correct answer: Weekly

CDC recommends using biological indicators at least weekly for each sterilizer in routine use, along with every load containing implantable devices.

Question 37: The maxillary sinus is most closely associated with which teeth?

Maxillary incisors and canines
Mandibular premolars
Maxillary premolars and molars (Correct answer)
Mandibular molars

Correct answer: Maxillary premolars and molars

The maxillary sinus (antrum of Highmore) is in proximity to the roots of maxillary premolars and molars, relevant in extractions and implant planning.

Question 38: Which of the following would be considered a breach of patient confidentiality in a dental practice?

Disclosing PHI to a public health authority as required by law
Providing records in response to a valid court order
Sharing records with a treating specialist with patient authorization
Discussing a patient's treatment in a public waiting room (Correct answer)

Correct answer: Discussing a patient's treatment in a public waiting room

Discussing identifiable patient information in a public area where others can overhear is a HIPAA violation regardless of intent.

Question 39: Under HIPAA, which of the following is an example of a permissible disclosure of protected health information (PHI) without patient authorization?

Disclosing PHI to a dental insurer for claims processing (Correct answer)
Sharing PHI with a marketing firm for advertising purposes
Selling PHI to a research company for profit
Releasing PHI to an employer for workplace monitoring

Correct answer: Disclosing PHI to a dental insurer for claims processing

HIPAA permits disclosure of PHI for treatment, payment, and healthcare operations, including insurance claims processing.

Question 40: What is a work breakdown structure in CDC practice?

Employee schedule report
Hierarchical decomposition of deliverables into manageable work packages (Correct answer)
Team member roster
Organizational reporting diagram

Correct answer: Hierarchical decomposition of deliverables into manageable work packages

A WBS breaks total scope into progressively smaller components for easier estimation, scheduling, and tracking.

Question 41: What is the critical path in CDC project scheduling?

The longest sequence of dependent tasks determining minimum duration (Correct answer)
The most expensive phase
Tasks that can be skipped
The shortest route to complete cheaply

Correct answer: The longest sequence of dependent tasks determining minimum duration

The critical path identifies the longest chain of dependent tasks; delays on these directly delay project completion.

Question 42: Which radiographic finding on a periapical film is most consistent with a periapical abscess?

Condensing osteitis
Internal root resorption
Hypercementosis of the root
Widened periodontal ligament space at the apex (Correct answer)

Correct answer: Widened periodontal ligament space at the apex

A periapical abscess typically shows a radiolucent area at the root apex with loss of lamina dura and widened PDL space.

Question 43: Which of the following best describes 'dual coverage' coordination of benefits?

A patient who visits two different dental offices in the same year
A single plan that covers both dental and medical expenses
A patient covered by two dental plans where benefits are coordinated to avoid overpayment (Correct answer)
Two deductibles applied simultaneously to one claim

Correct answer: A patient covered by two dental plans where benefits are coordinated to avoid overpayment

Dual coverage COB occurs when a patient has two dental insurance plans; the two insurers coordinate so that total reimbursement does not exceed 100% of the actual charges.

Question 44: Under the ethical principle of 'veracity,' a dentist is obligated to:

Avoid actions that could harm the patient
Treat all patients regardless of ability to pay
Respect the patient's right to make their own decisions
Provide truthful information to patients about their diagnosis and treatment options (Correct answer)

Correct answer: Provide truthful information to patients about their diagnosis and treatment options

Veracity requires dental professionals to be truthful and honest in all communications with patients, including disclosing diagnoses and treatment options accurately.

Question 45: Which tooth surface faces the cheek?

Buccal (Correct answer)
Lingual
Palatal
Mesial

Correct answer: Buccal

The buccal surface of posterior teeth faces the cheek (bucca means cheek in Latin).

Question 46: Which of the following best describes an amendment to a dental record?

Deleting electronic entries without a trace in the audit log
Adding a signed and dated addendum to correct or clarify a prior entry (Correct answer)
Shredding the original record and creating a new one
Erasing and replacing incorrect entries with correction fluid

Correct answer: Adding a signed and dated addendum to correct or clarify a prior entry

Proper amendments involve a signed, dated addendum rather than altering original entries, preserving the integrity of the record.

Question 47: What is the CDT code for periodontal scaling and root planing involving four or more teeth per quadrant?

D4342
D4341 (Correct answer)
D4355
D4910

Correct answer: D4341

D4341 covers periodontal scaling and root planing when four or more teeth per quadrant are treated, distinguishing it from D4342 which covers one to three teeth.

Question 48: What is 'balance billing' and why is it ethically significant in dental consulting?

A legitimate method for maximizing dentist revenue
Balancing claims between medical and dental insurers
Billing a patient for the difference between the dentist's fee and the plan's allowed amount when the dentist is in-network (Correct answer)
Billing multiple insurers for the same procedure

Correct answer: Billing a patient for the difference between the dentist's fee and the plan's allowed amount when the dentist is in-network

Balance billing in-network patients violates their plan agreement and represents an ethical breach because in-network providers have accepted negotiated fees as payment in full.

Question 49: What is the correct CDT code for a panoramic radiographic image used for orthodontic diagnosis?

D0322
D0210
D0330 (Correct answer)
D0340

Correct answer: D0330

D0330 covers panoramic radiographic images regardless of purpose, including orthodontic assessment.

Question 50: Which action best reduces cross-contamination between patients in a dental operatory?

Wearing the same gloves for multiple patients
Rinsing instruments with water between patients
Leaving instrument cassettes open on the counter
Using surface disinfectants rated for intermediate-level disinfection on clinical contact surfaces (Correct answer)

Correct answer: Using surface disinfectants rated for intermediate-level disinfection on clinical contact surfaces

EPA-registered intermediate-level surface disinfectants are required for clinical contact surfaces that may be contaminated with blood or saliva.

Question 51: When a dental consultant identifies a pattern of a provider submitting treatment plans for crowns on teeth with minimal restorations across multiple patients, the most appropriate initial action is to:

Initiate a focused clinical review or audit of the provider's records (Correct answer)
Approve all claims to avoid provider complaints
Report directly to law enforcement
Immediately terminate the provider from the network

Correct answer: Initiate a focused clinical review or audit of the provider's records

A utilization pattern suggesting over-treatment warrants a focused clinical audit before any adverse action against the provider.

Question 52: What does the term 'benefit period' refer to in dental insurance?

The period when a patient's insurance premiums are waived
The time when the patient can cancel the insurance plan
The time frame during which insurance covers dental services (Correct answer)
The period when the insurance company reviews claims

Correct answer: The time frame during which insurance covers dental services

A benefit period in dental insurance refers to the specific duration, usually a calendar year, during which a patient's insurance plan will cover eligible dental services up to a certain maximum amount. Once this period ends, benefits often reset, and a new deductible or maximum may apply. Understanding the benefit period is crucial for both patients and providers to manage treatment planning and billing.

Question 53: Which type of consent is implied when a patient opens their mouth for a routine examination?

Expressed written consent
Implied consent (Correct answer)
Informed consent
Proxy consent

Correct answer: Implied consent

Implied consent occurs when a patient's actions (e.g., opening their mouth) reasonably indicate agreement to a routine examination.

Question 54: According to OSHA's Bloodborne Pathogen Standard, hepatitis B vaccination must be offered to dental employees within how many days of hire?

30 days
10 days (Correct answer)
60 days
90 days

Correct answer: 10 days

OSHA requires employers to offer hepatitis B vaccination to occupationally exposed employees within 10 working days of initial assignment.

Question 55: A dental office must retain patient records for a minimum period set by state law. If state law is silent on the issue, HIPAA requires covered entities to retain documentation of their privacy policies for:

10 years from the date the record was created
3 years from the date of creation or last effective date, whichever is later
6 years from the date of creation or last effective date, whichever is later (Correct answer)
Until the patient reaches age 21

Correct answer: 6 years from the date of creation or last effective date, whichever is later

HIPAA requires covered entities to retain required documentation, including policies and procedures, for six years from the date of creation or the last effective date, whichever is later.

Question 56: What does CDT code D0460 represent?

Cone beam CT
Bitewing series
Pulp vitality tests (Correct answer)
Panoramic image

Correct answer: Pulp vitality tests

D0460 is the CDT code for pulp vitality tests used to assess the health of the dental pulp.

Question 57: When a dental patient requests an amendment to their health record under HIPAA, the covered entity may deny the request if:

The patient has outstanding balances with the practice
The record was not created by the covered entity receiving the request (Correct answer)
The dentist believes the original record is accurate
The amendment would increase the length of the record

Correct answer: The record was not created by the covered entity receiving the request

HIPAA permits denial of an amendment request when the covered entity did not create the information and the originating entity is available to respond.

Question 58: Which federal law specifically prohibits physicians and dentists who have a financial relationship with an entity from referring Medicare/Medicaid patients to that entity for designated health services?

False Claims Act
Anti-Kickback Statute
Stark Law (Physician Self-Referral Law) (Correct answer)
HIPAA Privacy Rule

Correct answer: Stark Law (Physician Self-Referral Law)

The Stark Law prohibits self-referrals to entities in which the referring provider has a financial interest for certain designated health services billed to federal programs.

Question 59: A patient taking warfarin requires dental extractions. Which analgesic is MOST appropriate to prescribe for post-operative pain?

Naproxen 500mg
Aspirin 650mg
Acetaminophen 500mg (Correct answer)
Ibuprofen 600mg

Correct answer: Acetaminophen 500mg

Acetaminophen does not affect platelet function or INR, making it the safest analgesic choice for patients on warfarin.

Question 60: What is the most common insurance-allowed frequency for periodontal maintenance (D4910) per year?

Monthly
Once per year
Every 6 months (twice per year)
Every 3 to 4 months (three to four times per year) (Correct answer)

Correct answer: Every 3 to 4 months (three to four times per year)

Most dental insurance plans allow D4910 up to three or four times per year (every 3–4 months), reflecting the clinical recommendation for supportive periodontal therapy intervals.

Question 61: A dental consultant evaluating radiographs identifies a 'soap bubble' or multilocular radiolucency of the posterior mandible. This is most suspicious for:

Periapical granuloma
Nasopalatine duct cyst
Condensing osteitis
Ameloblastoma (Correct answer)

Correct answer: Ameloblastoma

Ameloblastoma classically presents as a multilocular 'soap bubble' or 'honeycomb' radiolucency in the posterior mandible.

Question 62: Under the ADA Code of Professional Conduct, which principle requires a dentist to act in the patient's best interest even when it may not benefit the dentist financially?

Justice
Beneficence (Correct answer)
Nonmaleficence
Autonomy

Correct answer: Beneficence

Beneficence requires dental professionals to promote the patient's welfare above their own financial interests.

Question 63: A patient's dental chart shows furcation involvement classified as Class II. What does this indicate?

No furcation involvement is present
The furcation can be probed but not entered (Correct answer)
The furcation is completely destroyed through and through
The furcation is only detectable by radiograph

Correct answer: The furcation can be probed but not entered

Class II furcation involvement means the probe can enter the furcation horizontally but does not pass through to the other side.

Question 64: A patient presents with trismus, swelling, and a fever of 102°F. The dental consultant should recognize this as:

Temporomandibular joint arthritis
A space infection requiring urgent evaluation (Correct answer)
Normal post-extraction healing
Dry socket presentation

Correct answer: A space infection requiring urgent evaluation

Trismus with swelling and fever are hallmarks of a spreading odontogenic space infection, which may require hospitalization.

Question 65: What is peer review in CDC Infection Control & Prevention?

Creating competition
Determining promotions
Reducing workloads
Quality evaluation by qualified colleagues for improvement (Correct answer)

Correct answer: Quality evaluation by qualified colleagues for improvement

Peer review provides objective assessment by qualified professionals to identify improvements and ensure accountability.

Question 66: A patient taking bisphosphonates for osteoporosis requires a tooth extraction. Which complication should the dental consultant be MOST concerned about?

Anaphylaxis
Dry socket
Medication-related osteonecrosis of the jaw (MRONJ) (Correct answer)
Prolonged bleeding

Correct answer: Medication-related osteonecrosis of the jaw (MRONJ)

Bisphosphonates impair bone remodeling and vascularity, and invasive dental procedures can precipitate MRONJ, a serious and difficult-to-treat complication.

Question 67: Which benzodiazepine is MOST commonly used for oral conscious sedation in dentistry due to its intermediate half-life?

Triazolam (Correct answer)
Midazolam
Lorazepam
Diazepam

Correct answer: Triazolam

Triazolam is widely used for oral sedation in dentistry because of its rapid onset, intermediate duration, and amnesic properties.

Question 68: Which CDT code is used for a complete series of radiographic images?

D0272
D0120
D0210 (Correct answer)
D0330

Correct answer: D0210

D0210 is the CDT code for a complete series of radiographic images, typically 14–22 periapical and bitewing images.

Question 69: A dental consultant reviews a panoramic radiograph and notes a radiopaque mass with a 'sunburst' pattern. This is most consistent with:

Periapical cemento-osseous dysplasia
Osteosarcoma (Correct answer)
Ameloblastoma
Dentigerous cyst

Correct answer: Osteosarcoma

A 'sunburst' or 'sunray' pattern of bone destruction on radiograph is a classic sign of osteosarcoma requiring urgent referral.

Question 70: How does the Affordable Care Act (ACA) affect dental coding?

The ACA eliminates the need for dental billing codes
The ACA reduces dental coding requirements
The ACA does not affect dental practices or coding
The ACA encourages dental practices to code services according to new regulations (Correct answer)

Correct answer: The ACA encourages dental practices to code services according to new regulations

The Affordable Care Act (ACA) expanded health insurance coverage, including some pediatric dental benefits, and emphasized standardized, accurate coding to ensure proper billing and data collection. This encouraged dental practices to adhere to new or updated coding regulations, such as those related to ICD-10, to comply with federal mandates and facilitate claims processing. The ACA's focus on value-based care and accountability also pushed for greater transparency and precision in coding.

Question 71: What should a CDC professional do upon discovering a colleague's unethical conduct?

Confront publicly at a meeting
Post anonymously online
Report through appropriate channels with proper documentation (Correct answer)
Ignore it to maintain harmony

Correct answer: Report through appropriate channels with proper documentation

Professionals have an obligation to report misconduct through proper channels while documenting observations to support investigation.

Question 72: Why is accurate coding important in dental insurance billing?

To speed up patient appointment scheduling
To determine the location of the dental office
To increase the price of dental services
To ensure proper reimbursement and prevent claim issues (Correct answer)

Correct answer: To ensure proper reimbursement and prevent claim issues

Accurate coding in dental insurance billing is paramount because it directly impacts the financial health of the practice and the patient's out-of-pocket costs. Correct codes ensure that claims are processed efficiently, leading to timely and appropriate reimbursement from insurance companies. This also prevents claim denials, audits, or potential legal complications, establishing trust and compliance within the healthcare system.

Question 73: Which CDT code describes removal of a completely bony-impacted tooth?

D7220
D7230
D7240 (Correct answer)
D7210

Correct answer: D7240

D7240 is the CDT code for removal of a completely bony-impacted tooth, which is the most complex type of impaction.

Question 74: A patient discloses taking warfarin before an extraction. The primary risk management concern is:

Contraindication for nitrous oxide administration
Increased bleeding risk requiring anticoagulation management before the procedure (Correct answer)
Potential for allergic reaction to latex
Drug interaction with local anesthetics causing toxicity

Correct answer: Increased bleeding risk requiring anticoagulation management before the procedure

Warfarin increases bleeding risk; the dentist must assess INR levels and coordinate with the prescribing physician before surgical procedures.

Question 75: Which of the following best describes the 'birthday rule' used in COB for dependent children?

The mother's plan is always primary for children
The parent born first in the calendar year has the primary plan for the child (Correct answer)
The parent who is older always has the primary plan
The child's own individual plan is always primary

Correct answer: The parent born first in the calendar year has the primary plan for the child

Under the birthday rule, the plan of the parent whose birthday falls first in the calendar year is considered primary for dependent children.

Question 76: What documentation is typically required by insurers when submitting a claim for periodontal scaling and root planing (D4341/D4342)?

Patient consent form and fee schedule
Physician referral and medical history
Full mouth X-rays only
Periodontal probing depths, radiographic evidence of bone loss, and a description of clinical findings (Correct answer)

Correct answer: Periodontal probing depths, radiographic evidence of bone loss, and a description of clinical findings

Claims for SRP require supporting documentation including periodontal charting with probing depths, radiographs demonstrating bone loss, and narrative clinical findings to establish medical necessity.

Question 77: Which CDT code is used for frenulectomy — also called frenectomy or frenotomy?

D7950
D7960 (Correct answer)
D7970
D7980

Correct answer: D7960

D7960 is the CDT code for frenulectomy (frenectomy or frenotomy), the surgical removal or release of a frenum.

Question 78: What is the triple constraint in CDC project management?

Three completion phases
Three required team members
Three mandatory approvals
The interdependent relationship between scope, time, and cost (Correct answer)

Correct answer: The interdependent relationship between scope, time, and cost

Scope, time, and cost are interdependent: changing one affects the others. Managers must balance all three.

Question 79: Which federal agency has authority to register disinfectants and sterilants used on environmental surfaces in dental offices?

FDA (Food and Drug Administration)
OSHA (Occupational Safety and Health Administration)
CDC (Centers for Disease Control and Prevention)
EPA (Environmental Protection Agency) (Correct answer)

Correct answer: EPA (Environmental Protection Agency)

The EPA registers chemical germicides used on environmental surfaces; the FDA regulates those used on medical devices or applied to patients.

Question 80: What are record retention policies in CDC practice?

Destroying records yearly
Rules defining how long records must be kept and when destroyed (Correct answer)
Keeping everything forever
Paper storage only

Correct answer: Rules defining how long records must be kept and when destroyed

Retention policies establish consistent guidelines based on legal requirements and business needs.

Question 81: What does residual risk mean in CDC practice?

Initial risk before assessment
Budget overrun risk
Risk remaining after all controls are implemented (Correct answer)
Risk affecting waste materials

Correct answer: Risk remaining after all controls are implemented

Residual risk is the level remaining after practical controls are applied. Some is usually accepted as eliminating all risk is rarely feasible.

Question 82: What are principles of good documentation in CDC?

Only document positives
Accuracy, completeness, timeliness, objectivity, and legibility (Correct answer)
Include personal opinions
Speed is the only factor

Correct answer: Accuracy, completeness, timeliness, objectivity, and legibility

Good documentation must be accurate, complete, timely, objective, and legible.

Question 83: Which document must accompany an oral surgery claim to support medical necessity for a hospital-based procedure?

Insurance card copy
Patient consent form only
Radiograph only
Operative report and pre-operative evaluation notes (Correct answer)

Correct answer: Operative report and pre-operative evaluation notes

An operative report and pre-operative evaluation notes are required to substantiate medical necessity for hospital-based oral surgery claims.

Question 84: Under evidence-based treatment planning protocols, what is the recommended re-evaluation interval following active periodontal therapy before initiating restorative treatment?

Six months following completion of SRP
Immediately after completion of SRP
One year after periodontal therapy
Four to eight weeks post-SRP to assess tissue response and residual pocket depths (Correct answer)

Correct answer: Four to eight weeks post-SRP to assess tissue response and residual pocket depths

A 4–8 week re-evaluation allows tissue healing and reassessment of periodontal status before committing to restorative treatment.

Question 85: Which term describes the wearing away of tooth structure caused by chemical erosion from acids?

Attrition
Abrasion
Erosion (Correct answer)
Abfraction

Correct answer: Erosion

Erosion is the loss of tooth structure due to acid dissolution from intrinsic (GERD) or extrinsic (dietary acids) sources.

Question 86: Which government agency is primarily responsible for publishing the OIG Work Plan that identifies dental billing risk areas targeted for review?

Centers for Medicare & Medicaid Services (CMS)
American Dental Association (ADA)
Department of Justice (DOJ)
Office of Inspector General (OIG) of HHS (Correct answer)

Correct answer: Office of Inspector General (OIG) of HHS

The Office of Inspector General of the U.S. Department of Health and Human Services publishes the annual OIG Work Plan identifying compliance risk areas including dental billing.

Question 87: What is the significance of the periodontal ligament?

It prevents cavities from forming
It protects the tooth from physical damage
It attaches the tooth to the bone and permits slight movement (Correct answer)
It supplies blood to the tooth

Correct answer: It attaches the tooth to the bone and permits slight movement

The periodontal ligament (PDL) is a specialized connective tissue that surrounds the root of the tooth and connects it to the alveolar bone of the jaw. Its crucial role is to firmly anchor the tooth in its socket while also acting as a shock absorber. This allows for slight physiological movement during chewing, which prevents direct impact damage to the bone and tooth.

Question 88: What does 'interproximal' mean?

Between the tooth and gingiva
Between the root and alveolar bone
Between adjacent tooth surfaces (Correct answer)
Between the enamel and dentin

Correct answer: Between adjacent tooth surfaces

Interproximal refers to the area between adjacent teeth, including the contact point and surrounding tissues.

Question 89: A single periapical radiographic image is reported with which CDT code?

D0210
D0230
D0270
D0220 (Correct answer)

Correct answer: D0220

D0220 represents a single periapical radiographic image used to evaluate a specific tooth or area.

Question 90: A dentist performs a core buildup on a tooth in preparation for a crown. Which CDT code is reported separately from the crown?

D2931
D2710
D6010
D2950 (Correct answer)

Correct answer: D2950

D2950 is the CDT code for core buildup, including any pins when required, reported separately from the crown restoration.

Question 91: When a dental claim is submitted for a tooth extraction on a patient with uncontrolled diabetes, which code set provides the diabetes diagnosis?

CDT
CPT
ICD-10-CM (Correct answer)
HCPCS Level II

Correct answer: ICD-10-CM

ICD-10-CM provides diagnosis codes such as E11.65 (uncontrolled type 2 diabetes) to support medical necessity for dental services.

Question 92: What is the CDT code for surgical removal of a residual tooth root?

D7250 (Correct answer)
D7270
D7140
D7210

Correct answer: D7250

D7250 is the CDT code for surgical removal of residual tooth roots, including cutting the mucoperiosteum.

Question 93: Which of the following describes 'fee-for-service' dental insurance?

The provider receives a monthly per-patient capitation regardless of services rendered
The patient must use only in-network providers or receive no benefits
The insurer pays the provider a set fee for each covered procedure after it is performed (Correct answer)
The provider is paid a lump sum at the start of the plan year

Correct answer: The insurer pays the provider a set fee for each covered procedure after it is performed

Fee-for-service (indemnity) plans reimburse the provider or patient a set amount per procedure code after treatment is rendered.

Question 94: What is the primary purpose of compliance in dental coding?

To reduce the cost of dental procedures
To simplify insurance claims processing
To ensure accurate coding and prevent fraud (Correct answer)
To promote overbilling of services

Correct answer: To ensure accurate coding and prevent fraud

Compliance in dental coding refers to adhering to all relevant laws, regulations, and ethical guidelines when assigning codes for diagnoses and procedures. Its primary purpose is to ensure that all submitted claims are accurate, truthful, and medically necessary. This prevents fraudulent activities like upcoding or unbundling, protecting both the practice and the patient.

Question 95: What is 'furcation' in dental anatomy?

The area where two or more roots divide on a multi-rooted tooth (Correct answer)
The widest portion of the root
The junction of root and crown
The tip of the root

Correct answer: The area where two or more roots divide on a multi-rooted tooth

The furcation is the area where roots diverge on multi-rooted teeth; furcation involvement is a key periodontal finding.

Question 96: Which of the following represents the correct way to handle an error made in a paper dental record?

Tear out and replace the page containing the error
Use correction fluid to cover the mistake completely
Leave the error and add a note on a separate piece of paper filed elsewhere
Draw a single line through the error, write the correction, and initial and date it (Correct answer)

Correct answer: Draw a single line through the error, write the correction, and initial and date it

A single line through the error, with the correction, initials, and date, preserves the original entry while clearly marking the correction.

Question 97: State dental practice acts typically specify record retention periods. If a patient is a minor, retention typically extends:

Only 3 years from the last visit regardless of age
Until the age of majority plus an additional statutory period (Correct answer)
Indefinitely for all pediatric patients
Until the patient turns 18

Correct answer: Until the age of majority plus an additional statutory period

For minors, most states require records to be retained until the patient reaches the age of majority plus an additional period, often 3–7 years.

Question 98: What role do standard operating procedures play in CDC Pharmacology & Medication Management?

Creating unnecessary paperwork
Restricting creativity
Ensuring consistency and quality through documented instructions (Correct answer)
Satisfying management only

Correct answer: Ensuring consistency and quality through documented instructions

SOPs provide standardized instructions ensuring consistent quality regardless of which qualified person performs the work.

Question 99: When a dental practice transitions from paper to electronic health records (EHR), the paper records should be:

Scanned only for records from the past 6 months
Transferred to the patient's new provider without keeping copies
Retained according to applicable state retention laws during and after the transition (Correct answer)
Immediately destroyed to eliminate duplication

Correct answer: Retained according to applicable state retention laws during and after the transition

Paper records must be retained according to state retention requirements regardless of EHR implementation, as they remain legally valid documents.

Question 100: When documenting local anesthesia in a clinical note, which information is most critical to include?

The patient's pain threshold assessment
Type of anesthetic, quantity administered, and injection site (Correct answer)
The total cost of anesthetic materials used
The brand name of the anesthetic cartridge manufacturer

Correct answer: Type of anesthetic, quantity administered, and injection site

Documenting the anesthetic type, volume, and injection site provides essential information for continuity of care and helps identify causes of any adverse reactions.

Certified Dental Coder (CDC) Exam

This certification validates proficiency in dental coding, including CPT, CDT, and ICD-10-CM codes, and understanding of dental insurance and billing practices.

100

Questions

120 min

Time Limit

70%

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