Global maternity billing is among the most complex in all of medicine. These five mistakes are costing OB/GYN practices thousands every month — and most have no idea they're happening.
Global maternity billing is one of the most misunderstood areas in all of medical billing. Unlike most specialties where each visit is billed independently, OB/GYN practices must manage global maternity packages that bundle dozens of services into a single code — and the rules governing when to use those codes, how to track them, and what to do when circumstances change mid-pregnancy are complex enough to confuse even experienced billers.
The result? Practices lose thousands every month to billing errors they don't even know they're making.
Mistake 1: Wrong Global Period Start Date
The global maternity period begins at the first antepartum visit — not at the time of delivery, not at 20 weeks, not at the date of the delivery CPT code. This seems obvious, but it's one of the most common documentation errors we find during coding audits.
When the start date is wrong, the practice either:
- ›Overbills: Antepartum visits before the documented start date get billed separately, creating duplicate billing exposure
- ›Underbills: Antepartum visits after an incorrectly late start date get bundled when they should have been billed component-by-component
The fix: Train your front desk to document the exact date of the first OB visit in the EHR's designated global period field. Audit this field quarterly.
Mistake 2: Missing Antepartum Components
CPT codes 59400 (vaginal delivery with antepartum and postpartum care) and 59510 (cesarean with antepartum and postpartum care) are global packages that include:
- ›A minimum of 4 antepartum visits for code 59426
- ›A minimum of 7 antepartum visits for code 59425
If your practice delivers a patient who had fewer than 4 antepartum visits with you — because she transferred from another provider, changed insurance mid-pregnancy, or started care late — you cannot bill the global code. You must bill component codes instead.
Billing the global code when the antepartum visit threshold hasn't been met is both a revenue mistake and a compliance risk. We see this constantly in audits.
Mistake 3: VBAC Coding Errors
Vaginal Birth After Cesarean (VBAC) is billed with CPT 59610 or 59618, not 59400. The distinction matters because:
- ›59610 includes antepartum and postpartum care
- ›59618 covers only the delivery
- ›The payer reimbursement rates differ significantly
Many practices default to 59400 for all vaginal deliveries without checking the delivery history, leaving VBAC-specific codes unused. This creates both underbilling and incorrect documentation.
VBAC documentation should be clearly noted in the delivery record. Your billing team must review this before code selection.
Mistake 4: Mid-Pregnancy Insurance Changes
A patient switches from Plan A to Plan B at 28 weeks. Plan A covers weeks 1–27 of antepartum care; Plan B covers delivery and postpartum. This scenario is far more common than most practices realize.
The billing error: The practice bills the global package (59400) to Plan B, which never covers more than a handful of antepartum visits. Plan B denies the global code because it wasn't responsible for the antepartum period.
The correct approach: Split the billing. Bill Plan A for antepartum care up to the coverage end date using component codes (59425 or 59426). Bill Plan B for delivery and postpartum using the appropriate delivery-only code (59409, 59515, or 59618).
Missing this split can result in $1,200–$2,800 in uncollected revenue per patient.
Mistake 5: Postpartum Visit Underbilling
CPT 59430 covers postpartum care only — the visit(s) after delivery when not part of the global package. This code is legitimately billable when:
- ›The delivering provider did not provide antepartum care (the global package wasn't used)
- ›The patient changes providers for postpartum follow-up
- ›A mid-pregnancy insurance change means postpartum is being billed separately
Yet many practices never bill 59430, either because staff don't know it exists as a standalone code, or because the EHR defaulted to including it in a global bundle incorrectly.
Practices that audit their postpartum billing consistently find 59430 is their most-underbilled code, sometimes representing $8,000–$15,000 in annual missed revenue for a solo OB/GYN.
The Bottom Line
Global maternity billing errors are systematic — if your process has a flaw, you're making the same mistake on every applicable patient. A single coding audit can identify and quantify these errors, and most corrections can be implemented within one billing cycle.
If your practice delivers 100+ babies per year, there's a statistically strong probability that at least one of these five mistakes is costing you money right now.