Global maternity split billing: antepartum-only, delivery-only, and postpartum-only.
"Split it based on what you actually did" is the correct answer to transfer-of-care OB billing, and it's also the point where every competitor guide we reviewed goes vague. The real question a biller needs answered is narrower: exactly which code applies at exactly which visit count, exactly which code applies when a delivering provider never saw the patient before, and exactly how two providers avoid stepping on each other's claim for the same pregnancy. This guide answers all three with the specific codes and a decision table, not a restatement of the global-package rule.
Key takeaways
- Antepartum-only billing is visit-count-driven, not calendar-driven. 1–3 visits are individual E/M codes, 4–6 visits is 59425 billed once, 7+ visits is 59426 billed once — there's no code for exactly 3.5 visits or a partial range.
- Delivery-only codes assume the delivering provider is meeting the patient cold. 59409/59514/59612/59620 carry no antepartum or postpartum work, and the H&P documentation standard is different from a global claim precisely because the delivering provider has no prior chart on this pregnancy.
- 59430 has one hard gate: it cannot sit inside your own active global period. If your practice delivered the patient under a global code, postpartum is already paid inside that fee — billing 59430 on top of it is a duplicate, not an oversight a modifier fixes.
- CO-18 duplicate denials on split OB claims are a coordination failure, not a coding failure. They happen when two practices each bill a component of the same pregnancy without confirming, in writing, which one is billing what.
The three split scenarios, side by side
Split billing exists for exactly one reason: more than one provider touched a single pregnancy, so no single global code correctly describes what any one practice actually rendered. Three scenarios cover essentially every real-world split.
| Scenario | Code(s) | What's included |
|---|---|---|
| Antepartum care only, 1–3 visits | 99202–99215 (new/established E/M as applicable) | Standard office visit coding, not a global antepartum code — below the 4-visit floor for 59425 |
| Antepartum care only, 4–6 visits | 59425 | Reported once for the entire visit range, not per visit |
| Antepartum care only, 7+ visits | 59426 | Reported once regardless of how many visits beyond 7 |
| Delivery only, vaginal, patient not previously seen | 59409 | Delivery service alone — no antepartum or postpartum care |
| Delivery only, cesarean, patient not previously seen | 59514 | Delivery service alone — no antepartum or postpartum care |
| Delivery only, successful VBAC, patient not previously seen | 59612 | Delivery service alone — no antepartum or postpartum care |
| Delivery only, cesarean after failed VBAC attempt, patient not previously seen | 59620 | Delivery service alone — no antepartum or postpartum care |
| Postpartum care only | 59430 | Only reportable when the billing practice did not perform the delivery, or its own care was split from the start |
Antepartum-only: 59425, 59426, and the sub-4-visit E/M rule
The visit-count threshold is the entire decision. One to three antepartum visits before transfer or delivery elsewhere are billed as ordinary E/M codes — 99202–99205 for a new patient, 99212–99215 for an established one — selected on the same time-or-MDM basis as any other office visit, not tied to pregnancy-specific rules. At four to six visits, switch to 59425 and report it once for the whole block; individually coding each of the six visits as a separate E/M line after crossing the threshold is a common overbilling error that inflates the claim count without changing what's actually owed. At seven or more visits, 59426 replaces 59425 and is likewise reported once, regardless of whether the patient was seen 7 times or 14.
Every antepartum encounter, whether billed as E/M or bundled into 59425/59426, still needs a Z3A weeks-of-gestation code (Z3A.01–Z3A.42, plus Z3A.00 for unspecified) alongside the pregnancy-supervision diagnosis, confirmed as a valid HIPAA-billable category in the current ICD-10-CM code set. Payers use it to sanity-check that the visit count and gestational timing line up — six antepartum visits billed against a chart showing only 10 weeks of documented gestation is exactly the kind of mismatch that draws a records request before payment.
The visit-count rule applies per practice, not per pregnancy: if the patient was seen 5 times at practice A before transferring, and 4 times at practice B before delivering elsewhere again, practice A bills 59425 for its own 5 visits and practice B separately bills 59425 for its own 4 — each practice counts only its own encounters, never a combined total across practices.
Delivery-only: 59409, 59514, 59612, 59620
These four codes exist for exactly one clinical picture: a provider who delivers a patient they are meeting for the first time, or nearly so, because another practice managed the pregnancy. 59409 reports a vaginal delivery only, 59514 a cesarean delivery only, 59612 a successful vaginal delivery after a previous cesarean (VBAC), and 59620 a cesarean performed after a failed VBAC attempt. None of the four includes antepartum or postpartum work — that's the entire point of the code, and it's why they exist separately from 59410/59515/59614/59622, which are the same delivery routes bundled with routine postpartum care for a provider who will be managing the six-week visit too.
Documentation standards shift here in a way billers often miss: because the delivering provider has no prior antepartum chart on this pregnancy, the admission history and physical has to independently establish gestational age, risk factors, and delivery plan from whatever records accompany the transfer, rather than referencing the practice's own prior visit notes the way a global claim's H&P would. A thin transfer record plus a thin delivery-only H&P is a documentation gap that shows up on audit even when the delivery itself was billed correctly.
| Delivery route | Code |
|---|---|
| Vaginal delivery | 59409 |
| Cesarean delivery | 59514 |
| Vaginal birth after cesarean (successful VBAC) | 59612 |
| Cesarean following a failed VBAC attempt | 59620 |
Postpartum-only: 59430 and the global-period gate
59430 reports postpartum care alone — the six-week visit and related follow-up — and it has exactly one hard restriction that resolves most of the confusion around it: it cannot be billed by the same practice inside its own active 90-day global period from a delivery it performed under a global code. If your practice delivered the patient using 59400, 59510, 59610, or 59618, postpartum care is already priced into that global fee, and a separate 59430 claim on top of it is a duplicate service, not an additional one. 59430 only applies in two situations: a different practice performed the delivery, or your own practice's care was split into non-global components (antepartum-only, delivery-only) from the outset rather than billed globally.
The practical test before submitting 59430: check whether your own practice has an active global claim for this pregnancy on file. If it does, 59430 doesn't belong on a separate claim. If a different practice delivered, or your practice billed delivery-only, 59430 is correct and should reference the delivery date and delivering provider in the claim notes to preempt a payer's coordination-of-benefits query.
Decision table: who bills what when care transfers
The scenario that generates the most avoidable denials is mid-pregnancy transfer between two practices. This table maps the referring (transferring-out) provider's billing against the delivering (receiving) provider's billing for the same pregnancy.
| Referring provider rendered | Referring provider bills | Delivering provider rendered | Delivering provider bills |
|---|---|---|---|
| 1–3 antepartum visits | E/M codes (99202–99215) | Remaining antepartum + delivery + postpartum | Global code (59400/59510/59610/59618) if the delivering practice manages the rest of antepartum, delivery, and postpartum itself |
| 4–6 antepartum visits | 59425 | Delivery only, no prior visits with this patient | 59409/59514/59612/59620 |
| 7+ antepartum visits | 59426 | Delivery + postpartum | Delivery-only code, then 59430 separately for postpartum if the delivering practice also does the 6-week visit |
| All antepartum + delivery (patient transfers immediately postpartum) | Delivery-only code for the route delivered, no 59430 | Postpartum visit only | 59430 |
The pattern across every row: each provider bills only for the phase(s) it actually rendered, and the global code is reserved exclusively for the practice that handled the full antepartum-through-postpartum arc itself. A delivering provider should never default to a global code just because it feels like "the whole delivery episode" from that provider's vantage point — if antepartum care happened elsewhere, the global code overstates what that practice did and typically gets recouped once the payer's system flags the other practice's antepartum claim for the same patient and pregnancy.
Avoiding the CO-18 duplicate denial
CO-18 fires when a payer's system sees two claims that appear to cover the same service for the same patient and date range, which is exactly what happens when two practices each bill a component of one pregnancy without coordinating. The two most common triggers: both practices bill something that reads as global-equivalent (e.g., the referring practice bills 59426 for 8 antepartum visits while the delivering practice separately bills a global code that also claims the antepartum work), or the delivering practice bills both a global code and a separate 59430 for the same delivery.
- Confirm with the other practice, in writing, exactly which phase each of you is billing before either claim goes out.
- Document the transfer-of-care date and reason in the chart, and reference it in claim notes on both sides.
- Check for your own practice's active global claim on this pregnancy before submitting a separate 59430.
- Count antepartum visits per practice, not across the whole pregnancy, when choosing between 59425 and 59426.
- Don't bill a global code when your practice didn't render the full antepartum-through-postpartum arc itself.
- Don't bill 59430 on top of your own global delivery code for the same pregnancy.
- Don't assume the other practice's billing intentions — confirm them before submission, not after a CO-18 denial arrives.
- Don't bill individual E/M codes past 3 antepartum visits, or 59425 for fewer than 4.
When a CO-18 denial does land, the fix is almost never an appeal in the traditional sense — it's a determination of which of the two claims is correct and a withdrawal of the other. That conversation goes faster when the coordination happened before submission rather than after a denial forces it. More CARC-specific appeal language, including for denials outside the split-billing scenario, is in our OB/GYN denials and appeals guide: the codes, the causes, and the fix, and if duplicate and coordination-of-benefits denials are a recurring drag on your OB claims specifically, our denials management service can work that root cause directly. NCCI bundling inside the gynecologic surgical codes that sit alongside this maternity-billing logic is covered separately in our OB/GYN NCCI edits and bundling guide: colposcopy, hysteroscopy, and ablation.
Losing revenue to split-care OB denials?
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Frequently asked questions
How many antepartum visits does it take before we bill 59425 instead of E/M codes?
Four. One to three antepartum visits are billed as standard E/M codes (99202-99215), not as a global antepartum code. At four to six visits, bill 59425 once for the entire range rather than coding each visit separately. At seven or more visits, bill 59426 once, regardless of exactly how many visits beyond seven were rendered. Billing individual E/M codes past the three-visit threshold, or billing 59425 for fewer than four visits, are both common triggers for a payer to recode the claim to whichever bucket it actually falls into, which delays payment even when the total dollar difference is small.
Can a delivering provider bill a global code if they never saw the patient for prenatal care?
No. The global codes (59400, 59510, 59610, 59618) require that practice to have rendered the routine antepartum schedule, the delivery, and postpartum care itself. A provider who only performs the delivery for a patient transferred in from another practice bills a delivery-only code instead: 59409 for vaginal, 59514 for cesarean, 59612 for a successful VBAC, or 59620 for a cesarean following a failed VBAC attempt. Billing a global code without having rendered the antepartum component is a common cause of a payer recouping the claim after the fact once the other practice's antepartum claim surfaces in the payer's system.
Why do we keep getting CO-18 duplicate denials on split OB claims?
CO-18 fires when two providers each submit a claim for the same pregnancy and their components overlap or aren't clearly differentiated on the claim, most often when both bill a global-sounding code, or one bills global while the other separately bills postpartum. The fix is coordination before submission: confirm which practice is billing antepartum-only, delivery-only, and postpartum-only, put the transfer-of-care date in the chart, and never let the delivering practice bill 59430 on top of its own global code for the same pregnancy, since postpartum care is already bundled into that global fee.
Verify before billing. CPT is a registered trademark of the American Medical Association; codes here are paraphrased, not reproduced from the CPT Professional edition. CPT, HCPCS and ICD-10 codes, coverage policy, and bundling edits change, including annual code-set updates. This page reflects standard industry practice and is provided for general education — it is not a substitute for your own compliance review, your current payer contracts, or the current-year code sets. Confirm requirements against your specific payer mix before submitting claims.