Gynecology & Obstetrics Billing Services
OB/GYN billing is split into two fundamentally different billing models under one roof. Gynecology follows standard E/M and surgical coding rules — office visits, laparoscopic procedures, hysterectomies. But obstetrics operates on a global package model where a single CPT code (59400, 59510, 59610) bundles all antepartum visits, delivery, and postpartum care into one payment. Managing the intersection of these two billing models, knowing when care falls inside versus outside the OB global, and capturing separately billable complications is where most OB/GYN practices lose significant revenue.
The OB global package is particularly treacherous. A routine pregnancy billed under 59400 (vaginal delivery with antepartum and postpartum care) includes approximately 13 antepartum visits, the delivery, and postpartum care. But if the patient develops gestational diabetes, preeclampsia, or other complications requiring visits beyond the routine package, those additional visits are separately billable with the right diagnosis coding and modifier 25. Most practices simply absorb these visits into the global, leaving thousands of dollars per complicated pregnancy unbilled.
Gynecology & Obstetrics billing at a glance
Common gynecology & obstetrics procedures we bill daily.
Obstetric Global Packages
Gynecologic Surgery
In-Office Procedures
Gynecology & Obstetrics billing challenges we solve every day.
Gynecology & Obstetrics is one of the most complex specialties to bill. High-value procedures, strict documentation requirements, and frequent payer policy changes mean even experienced in-house billers miss revenue. For coding standards, see the American College of Obstetricians and Gynecologists.
Global OB Package vs. Separately Billable Complications
The OB global package assumes a routine, uncomplicated pregnancy. When complications arise — gestational diabetes (O24.4xx), preeclampsia (O14.xx), hyperemesis (O21.0), preterm labor (O60.xx) — the additional visits, monitoring, and management required beyond the routine schedule are separately billable. But they require a complication-specific diagnosis code that differs from the routine pregnancy ICD-10. Evolution tracks each pregnant patient’s complication status and ensures every visit beyond the global routine is identified, coded with the appropriate complication diagnosis, and billed separately with modifier 25.
Hysterectomy Route and Code Selection
Hysterectomy coding depends on the surgical approach (abdominal, vaginal, laparoscopic, robotic-assisted), the extent of the procedure (total vs. supracervical, with or without oophorectomy), and the weight of the uterus (>250 grams changes the code). Choosing 58571 (laparoscopic total hysterectomy) versus 58573 (same, with oophorectomy) versus 58150 (abdominal total hysterectomy) changes reimbursement by hundreds of dollars. The operative report must document the approach, structures removed, and uterine weight. Evolution matches every hysterectomy to the most specific and accurate CPT code.
Ultrasound Billing and Professional Component
OB/GYN practices often perform ultrasounds in-office but misconfigure the billing. If the practice owns the ultrasound equipment and employs the technician, both the technical (TC) and professional (26) components are billable. If the ultrasound is performed at a hospital or imaging center, only the interpretation (modifier 26) applies. Additionally, limited OB ultrasounds (76815) versus complete OB ultrasounds (76801) have different documentation requirements, and billing a complete when only a limited was performed (or vice versa) causes denials. Evolution configures ultrasound billing correctly based on facility ownership and documentation.
Preventive Visit Overlap and Modifier 25
Many OB/GYN patients present for their annual well-woman exam (preventive E/M) but also have complaints requiring a problem-oriented E/M. Billing both requires modifier 25 on the problem visit and distinct documentation separating the preventive service from the problem-oriented service. Similarly, Pap smear collection (Q0091) is separately billable from the office visit but often gets bundled. Evolution ensures both services are captured and properly modified when performed together.
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