100+ Free COBGC Practice Questions
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Key Facts: COBGC Exam
150
Total Items
AAPC
5h 40m
Exam Time
AAPC
$299
AAPC Member Fee
AAPC
Z3A
Required with O-codes
Weeks of gestation
The AAPC COBGC consists of 150 MCQ items over 5h40m with 70% passing. Fee $299 AAPC member. Master global OB packages (59400 vaginal, 59510 cesarean), gynecologic surgery codes, ICD-10-CM Chapter 15 (O-codes with required Z3A weeks of gestation), and multiple gestation coding rules.
Sample COBGC Practice Questions
Try these sample questions to test your COBGC exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.
1Which structure is the primary site of fertilization in the female reproductive system?
2Endometriosis is best described as the presence of:
3The transformation zone of the cervix is clinically important because it is the most common origin site of:
4Which ovarian ligament contains the ovarian artery and vein?
5Adenomyosis is characterized pathologically by:
6Which placental abnormality is defined as the placenta covering the internal cervical os?
7PCOS (polycystic ovary syndrome) classically presents with all EXCEPT:
8Which type of ovarian cyst is associated with elevated beta-hCG and theca cell luteinization?
9The most common location for ectopic pregnancy is:
10Cervical intraepithelial neoplasia grade 3 (CIN 3) histologically describes:
About the COBGC Exam
AAPC specialty credential for OB-GYN coders. Validates expertise in global OB package coding (59400 vaginal global, 59510 cesarean global, antepartum/postpartum-only codes), gynecologic surgery (hysterectomy abd/vag/lap, D&C, hysteroscopy, endometrial ablation), in-office gyn procedures (IUD, Nexplanon, colposcopy, LEEP), ICD-10-CM Chapter 15 (pregnancy O-codes with required Z3A weeks of gestation), and OB-specific multiple gestation modifier rules.
Questions
150 scored questions
Time Limit
5 hours 40 minutes
Passing Score
70%
Exam Fee
$299 AAPC member (AAPC)
COBGC Exam Content Outline
OB-GYN Anatomy and Pathology
Female reproductive anatomy, common conditions, pregnancy physiology
CPT OB Care (Antepartum, Delivery, Postpartum, Global)
59400 vaginal global, 59510 cesarean global, 59425/59426 antepartum, 59430 postpartum
CPT Gyn Surgery
Hysterectomy abd 58150-58200, vag 58260-58294, lap 58550-58573; D&C, hysteroscopy, endometrial ablation
CPT Gyn Diagnostic and In-Office
IUD 58300, Nexplanon 11981/11982, colposcopy 57452-57456, LEEP/cone 57460-57461
ICD-10-CM Pregnancy/Childbirth (Ch 15) and GU (Ch 14)
O00-O9A pregnancy codes, Z3A weeks of gestation REQUIRED, N-codes for gynecology
Modifiers, E/M and Compliance
22 increased complexity, 51 multiple, 57/58/78/79 global rules, multiple gestation add-ons
How to Pass the COBGC Exam
What You Need to Know
- Passing score: 70%
- Exam length: 150 questions
- Time limit: 5 hours 40 minutes
- Exam fee: $299 AAPC member
Keys to Passing
- Complete 500+ practice questions
- Score 80%+ consistently before scheduling
- Focus on highest-weighted sections
- Use our AI tutor for tough concepts
COBGC Study Tips from Top Performers
Frequently Asked Questions
What's the difference between 59400 and 59409?
59400 = global OB package (antepartum + vaginal delivery + postpartum) — used when same provider/group manages all three phases. 59409 = vaginal delivery ONLY — used when a different provider managed antepartum (e.g., transferred care from one practice to another). 59410 = vaginal delivery + postpartum (no antepartum). 59425/59426 = antepartum care only (4-6 visits / 7+ visits). 59430 = postpartum care only.
Do I need Z3A codes with O-codes?
YES. Per ICD-10-CM Official Guidelines, Z3A.xx (weeks of gestation) is REQUIRED with most pregnancy/childbirth/puerperium codes (Chapter 15, O00-O9A). Examples: Z3A.39 = 39 weeks gestation. Trimesters: 1st <14 wks, 2nd 14-27 wks 6 days, 3rd 28+ wks. Z3A is paired with the principal pregnancy diagnosis on each encounter.
How do I code multiple gestation deliveries?
Code each delivery method individually. Vaginal delivery of twins: 59400 (or 59409) for first; for second twin same vaginal route, add CPT 59409 with modifier 51 (multiple procedures). If second twin requires cesarean: 59514 cesarean with modifier 51. Cesarean of both twins: 59510 once for the case (one cesarean = one operation regardless of fetus count). ICD-10-CM uses O30.xx for multiple gestation.