OB/GYN billing manages two completely different billing models under one roof — and mixing them up is one of the most common and expensive errors in the specialty.
Obstetric care is billed as a global package. The global OB package covers all antepartum visits, the delivery, and the postpartum visit — bundled into a single payment. Individual antepartum visits should not be billed separately to insurance while a global package is in progress, unless the patient delivers before completing the full antepartum course, in which case the individual visits completed before delivery are billed separately.
Gynecological care, by contrast, is billed visit by visit — E/M codes, procedure codes, preventive care codes. A biller who doesn’t clearly separate the OB and GYN workflows will either over-bill the OB global (triggering audits and recoupments) or under-bill the GYN visits (leaving revenue uncaptured).
The Three Billing Problems That Hit OB/GYN Practices Hardest
1. Global OB Package Mismanagement
The global obstetric package is billed once — at or after delivery — for the full course of care. The challenge is tracking: which antepartum visits have been rendered, whether the patient is still active or transferred care, whether the delivery happened at a different facility, and whether the postpartum visit was completed. When any of these pieces is missing or miscounted, the global package claim is wrong.
The most common version of this error: the practice bills the global package at delivery without accounting for visits the patient had early in pregnancy before establishing care — visits that belong to a previous provider’s billing. Or the opposite: they forget to bill the global and instead leave a string of unbilled antepartum visits sitting in the system.
2. Gynecological E/M Under-Coding Post-2021
GYN practices face the same E/M under-coding problem as primary care — and it hits the same way. The 2021 AMA changes moved level selection to Medical Decision Making and total time. Many OB/GYN practices are still coding established GYN visits as 99213 when the complexity of the encounter — contraceptive management, abnormal Pap follow-up, pelvic pain workup — supports 99214 or 99215.
3. Preventive vs. Problem Visit Billing on the Same Day
A patient comes in for her annual well-woman exam. During the visit, the physician also addresses abnormal bleeding — a separately significant problem. Both services are billable. But only when Modifier 25 is attached to the problem-focused E/M and the documentation clearly distinguishes the two services. Without it, the payer bundles the E/M into the preventive rate and the practice loses the additional reimbursement.
An OB/GYN practice with two physicians came to us after a billing review identified inconsistent collections on their obstetric patients. Some global packages were being billed correctly. Others were being billed with antepartum visit counts that didn’t match what the chart showed — either over-counting visits that hadn’t all been rendered at their practice, or under-counting because not all visits had been linked to the global package record.
We audited six months of obstetric billing in their eClinicalWorks system. The global package workflow was being managed manually — there was no systematic tracking of antepartum visits per patient against the expected count. Packages were being billed based on what the front desk remembered, not what the chart showed.
We built a global OB tracking workflow: every active OB patient on a single list, their expected delivery date, their antepartum visit count, and a flag for any patient who transferred care, delivered early, or was approaching delivery without a complete antepartum record. Before any global package claim was submitted, it was reconciled against the tracking list.
On the GYN side, we found the E/M under-coding pattern — the majority of established GYN visits coded at 99213 regardless of MDM. We corrected prospectively and applied the Modifier 25 workflow for same-day preventive plus problem visits. Monthly GYN collections increased by $6,000 within the first full quarter.
Common OB/GYN Billing Denial Codes
| Denial Code | Reason | Fix |
|---|---|---|
| CO-97 | Antepartum visit bundled into global package | Do not bill individual antepartum visits while global package is active |
| CO-4 | Modifier 25 missing on same-day E/M + preventive | Apply Modifier 25 and document separately significant problem |
| CO-50 | Non-covered service | Verify GYN procedure coverage per plan — contraceptive management varies significantly |
| CO-11 | Diagnosis not consistent with procedure | ICD-10 specificity — trimester, presentation, complication codes required for OB |
| CO-B7 | Provider not credentialed | Verify both physicians credentialed with all active maternity plans quarterly |
Frequently Asked Questions
How do you manage global OB package billing across multiple physicians?
We maintain an active OB tracking list — every patient, expected delivery date, antepartum visit count, and delivering provider. Before any global package is billed, it’s reconciled against the tracking list. Transfers of care, early deliveries, and shared-care arrangements are flagged for manual review. The free RCM manager audits the list weekly.
How do you handle the GYN vs. OB billing split?
OB and GYN billing run on separate workflows in our system. Active OB patients are tracked against the global package. GYN patients are billed visit by visit with E/M level review, Modifier 25 checks on same-day preventive visits, and procedure coding verified per payer. The two workflows don’t touch each other.
What EHR systems do your OB/GYN billers support?
eClinicalWorks, Epic, athenahealth, Greenway Health, and NextGen. Our billers know the global OB package workflows, GYN procedure coding, and antepartum visit tracking in each platform.
OB/GYN billing errors are almost always about tracking — the global package that wasn’t reconciled, the visit that wasn’t counted, the modifier that wasn’t added. A dedicated biller with a systematic workflow eliminates all three.
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