100+ Free COBGC Practice Questions

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A diagnostic hysteroscopy with biopsy and D&C is reported with which CPT code?

58559

58555

58558

58563

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2026 Statistics

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?

A.Uterine fundus

B.Ampulla of the fallopian tube

C.Endocervical canal

D.Ovarian cortex

Explanation: Fertilization typically occurs in the ampulla, the widest portion of the fallopian tube, where the sperm meets the oocyte after ovulation.

2Endometriosis is best described as the presence of:

A.Benign smooth-muscle tumors of the myometrium

B.Endometrial-like tissue outside the uterine cavity

C.Hyperplastic endometrial glands within the uterus

D.Squamous metaplasia of the cervical transformation zone

Explanation: Endometriosis is defined by the presence of endometrial-like glands and stroma outside the uterine cavity, commonly on the ovaries, peritoneum, and uterosacral ligaments.

3The transformation zone of the cervix is clinically important because it is the most common origin site of:

A.Endometrial adenocarcinoma

B.Cervical squamous cell carcinoma

C.Vulvar melanoma

D.Ovarian serous carcinoma

Explanation: The transformation zone (squamocolumnar junction) is where most cervical dysplasia and squamous cell carcinoma arise, which is why colposcopy and Pap sampling target this area.

4Which ovarian ligament contains the ovarian artery and vein?

A.Round ligament

B.Broad ligament

C.Infundibulopelvic (suspensory) ligament

D.Utero-ovarian ligament

Explanation: The infundibulopelvic (suspensory) ligament of the ovary carries the ovarian artery, vein, and lymphatics from the pelvic sidewall to the ovary; it is ligated during oophorectomy.

5Adenomyosis is characterized pathologically by:

A.Endometrial glands and stroma within the myometrium

B.Endometrial polyps protruding into the uterine cavity

C.Cystic enlargement of the ovaries with theca-lutein cells

D.Trophoblastic tissue without a fetus

Explanation: Adenomyosis is defined by the presence of endometrial glands and stroma deep within the myometrium, causing a globular, enlarged uterus with dysmenorrhea and menorrhagia.

6Which placental abnormality is defined as the placenta covering the internal cervical os?

A.Placenta accreta

B.Placenta previa

C.Placental abruption

D.Vasa previa

Explanation: Placenta previa occurs when the placenta implants over or near the internal cervical os, causing painless third-trimester bleeding and often necessitating cesarean delivery.

7PCOS (polycystic ovary syndrome) classically presents with all EXCEPT:

A.Oligo-ovulation or anovulation

B.Hyperandrogenism

C.Polycystic ovarian morphology

D.Elevated serum CA-125

Explanation: PCOS is diagnosed using the Rotterdam criteria (two of three): oligo-ovulation, hyperandrogenism, polycystic ovarian morphology. CA-125 is a tumor marker used in ovarian cancer evaluation, not PCOS.

8Which type of ovarian cyst is associated with elevated beta-hCG and theca cell luteinization?

A.Corpus luteum cyst

B.Theca-lutein cyst

C.Endometrioma

D.Dermoid cyst

Explanation: Theca-lutein cysts arise from ovarian hyperstimulation by high beta-hCG levels, classically with hydatidiform mole, multiple gestation, or fertility therapy.

9The most common location for ectopic pregnancy is:

A.Ovary

B.Cervix

C.Fallopian tube ampulla

D.Abdominal cavity

Explanation: More than 95% of ectopic pregnancies implant in the fallopian tube, with the ampulla being the most common segment involved.

10Cervical intraepithelial neoplasia grade 3 (CIN 3) histologically describes:

A.Dysplasia confined to the lower one-third of the epithelium

B.Dysplasia involving the lower two-thirds of the epithelium

C.Full-thickness dysplasia (carcinoma in situ)

D.Stromal invasion beyond the basement membrane

Explanation: CIN 3 represents severe dysplasia or carcinoma in situ — full-thickness epithelial dysplasia without basement-membrane invasion. Once invasion occurs, the lesion is classified as invasive carcinoma.

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

10%

OB-GYN Anatomy and Pathology

Female reproductive anatomy, common conditions, pregnancy physiology

25%

CPT OB Care (Antepartum, Delivery, Postpartum, Global)

59400 vaginal global, 59510 cesarean global, 59425/59426 antepartum, 59430 postpartum

25%

CPT Gyn Surgery

Hysterectomy abd 58150-58200, vag 58260-58294, lap 58550-58573; D&C, hysteroscopy, endometrial ablation

10%

CPT Gyn Diagnostic and In-Office

IUD 58300, Nexplanon 11981/11982, colposcopy 57452-57456, LEEP/cone 57460-57461

15%

ICD-10-CM Pregnancy/Childbirth (Ch 15) and GU (Ch 14)

O00-O9A pregnancy codes, Z3A weeks of gestation REQUIRED, N-codes for gynecology

15%

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

1Master global OB packages: 59400 vaginal global, 59510 cesarean global, 59618 VBAC global; component codes (59409 vaginal only, 59514 cesarean only, 59425/59426 antepartum, 59430 postpartum) for split-care

2Memorize Z3A requirement: weeks of gestation REQUIRED on pregnancy codes; trimester definitions matter for code-set logic

3Know hysterectomy code differentiation: route (abd 58150 vs vag 58260 vs lap 58550 vs total lap 58570) AND with vs without removal of tubes/ovaries AND uterine weight (>250g uses higher code level for some lap)

4Understand multiple gestation: vaginal twin = primary delivery + 59409 with modifier 51; cesarean of twins = single cesarean code (one surgery)

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.