COBGC Cheat Sheet 2026

The 30 highest-yield COBGC facts, distilled from real exam questions. Print it, save it as a PDF, or study it here — free, no sign-up.

1. When a second surgical procedure is performed during the same operative session, which modifier is typically appended to the secondary procedure? → Modifier 51
2. When coding a laparoscopic-assisted procedure that was converted to an open procedure due to intraoperative complications, which coding guideline applies? → Code the open procedure only; the laparoscopic attempt is not separately billable
3. How are laparoscopic gynecologic procedures coded? → Using specific laparoscopic CPT codes distinct from open procedure codes
4. The term 'metrorrhagia' refers to: → Uterine bleeding between periods
5. Which CPT code describes sperm isolation using a complex preparation method such as Percoll gradient? → 89261
6. A patient has gestational diabetes mellitus during pregnancy that requires insulin for control. Which ICD-10-CM code applies? → O24.414 – Gestational diabetes mellitus in pregnancy, insulin controlled
7. Which modifier is appended to a CPT code to indicate that a procedure was performed bilaterally? → Modifier 50
8. Under the 2021 MDM guidelines, which of the following falls under the 'Amount and/or Complexity of Data' element? → Reviewing external records and ordering or reviewing diagnostic tests
9. A patient at 28 weeks has gestational diabetes mellitus controlled by diet only. Which ICD-10-CM code is most specific? → O24.410
10. Documentation of medical necessity for a GYN procedure is primarily supported by which part of the medical record? → The ICD-10-CM diagnosis codes linked to the procedure and the clinical notes
11. A patient at 30 weeks is diagnosed with gestational hypertension WITHOUT significant proteinuria. Which ICD-10-CM code category applies? → O13
12. A patient develops endometritis 10 days after vaginal delivery. How should this be coded under ICD-10-CM? → O86.12
13. According to ICD-10-CM guidelines, codes from Chapter 15 (Pregnancy, Childbirth, and the Puerperium) are used only on: → The maternal medical record
14. Under CPT coding conventions, a semicolon (;) in a code descriptor indicates: → That the portion before the semicolon is shared by the indented codes that follow
15. A normal term pregnancy spans which gestational age range? → 37–42 weeks
16. The term 'dyspareunia' is best defined as: → Painful intercourse
17. The term 'cervical ectropion' (ectopy) describes: → Eversion of columnar epithelium from the endocervix onto the ectocervix
18. Which document serves as the primary compliance roadmap outlining an OB/GYN practice's commitment to ethical billing and coding standards? → The compliance plan
19. Which CPT code represents the global obstetric care package for a planned cesarean delivery, including antepartum and postpartum care? → 59510
20. According to ICD-10-CM guidelines, when a delivery occurs and no complication is documented, which code is used? → O80 – Encounter for full-term uncomplicated delivery
21. Which statement is true regarding ICD-10-CM coding of trimesters in obstetric cases? → The second trimester begins at 13 weeks 0 days and ends at less than 28 weeks
22. The term 'colporrhaphy' describes a surgical procedure involving the: → Repair of the vaginal wall
23. In the term 'primigravida,' what does 'primi-' indicate? → First pregnancy
24. Under the 2021 E&M guidelines, 'total time' for office/outpatient visits includes: → All physician time spent on the date of service, including pre- and post-visit activities
25. Which federal law establishes criminal penalties for knowingly submitting false claims to Medicare or Medicaid? → The False Claims Act
26. A patient undergoes excision of a vaginal cyst. Which CPT code range covers this procedure? → 57135
27. A surgeon performs a laparoscopic bilateral salpingo-oophorectomy. Which CPT code is most appropriate? → 58661
28. Which anatomical term describes the os at the top of the cervical canal where it meets the uterine cavity? → Internal os
29. Which CPT code is used when thawing cryopreserved embryos prior to a frozen embryo transfer (FET)? → 89354
30. Which federal law mandates that group health plans cover maternity and newborn care for a minimum of 48 hours following a vaginal delivery? → The Newborns' and Mothers' Health Protection Act (NMHPA)