Why CPT 59400 Global OB Claims Deny — and What Changes in 2027

The global obstetric package is the single most misunderstood construct in OB billing, and it is about to disappear. Understanding why global claims deny today is still worth doing — the same claims are being adjudicated now, and the reasoning behind the 2027 restructure is largely a response to how badly the global model fits real patterns of care.

What the global package includes

The global obstetric codes bundle routine antepartum care, the delivery itself, and routine postpartum care, provided by the same physician or group. They do not include obstetric ultrasound, laboratory work, or the management of conditions unrelated to the pregnancy. Routine fetal heart tones taken with a handheld Doppler at an antepartum visit are included.

• 59400 — Routine obstetric care including antepartum care, vaginal delivery and postpartum care.
• 59510 — Routine obstetric care including antepartum care, cesarean delivery and postpartum care.
• 59610 — Routine obstetric care including antepartum care, vaginal delivery after previous cesarean, and postpartum care.
• 59618 — Routine obstetric care including antepartum care, cesarean delivery following attempted vaginal delivery after previous cesarean, and postpartum care.

Denial driver 1: the patient transferred care mid-pregnancy

This is the dominant driver. When a patient changes practices, neither practice provided the full global service, so neither should bill the global code. The practice that provided antepartum care only reports 59425 or 59426 depending on visit count; the practice that delivered reports the delivery-only code plus whatever antepartum and postpartum care it actually provided.

The fix: a transfer flag on the chart at intake that blocks global billing, and a visit count that the biller can see without reading the whole record.

Denial driver 2: the visit count does not match the antepartum code

59425 describes 4 to 6 antepartum visits and 59426 describes 7 or more. One to three visits are not reported with either — they are billed as individual E/M services. Practices that default to 59426 without counting will see denials and, on audit, refund requests.

The fix: count the visits from the record at the point of billing, and make the count visible on the claim worksheet.

Denial driver 3: the patient changed plans mid-pregnancy

A payer will not pay a global package covering months during which the patient was not its member. The care has to be split along the coverage boundary and billed to each payer for its own period. Billing the whole global to the payer in force at delivery is a predictable denial.

Denial driver 4: a second practice already billed the global

Where a covering physician or a second group has already reported the global code for the same pregnancy, the later claim is a duplicate. This shows up most often with locum coverage and with cross-covering call groups that bill under separate tax identification numbers.

Denial driver 5: services bundled that should have been billed separately

Obstetric ultrasound is separately billable throughout the pregnancy and is not part of the global package. Practices that treat the global code as covering everything leave the entire ultrasound line uncollected.

Denial driver 6: complications billed inside the global

Care for conditions that are not routine obstetric care — management of a significant comorbidity, an unrelated illness, or a complication requiring work well beyond routine antepartum care — may be separately reportable. Rolling everything into the global under-reports the work performed.

Documentation checklist

• Transfer status recorded at intake, with the date care began or ended.
• Antepartum visit count, documented and visible to the biller.
• Insurance changes during the pregnancy, with effective dates.
• Confirmation that no other group has reported a global code for the pregnancy.
• Ultrasounds billed as discrete claims, not absorbed into the global.
• Delivery type recorded, so the correct global or delivery-only code is chosen.

What changes on 1 January 2027

The CPT 2027 code set restructures maternity care reporting effective 1/1/2027. The change is an AMA CPT Editorial Panel action, developed with ACOG — a revision of the CPT code set itself, not a CMS payment rule. In total 17 codes are deleted, 12 are added and 6 are revised. The deleted codes include all four global packages — 59400, 59510, 59610 and 59618 — and the antepartum-only codes 59425 and 59426.

From that date, obstetric care is reported as four separate phases — antepartum care, labor management, delivery and postpartum care — each reported in its own right, rather than bundled into a single end-of-pregnancy package. In practice this converts obstetric billing from one large end-of-pregnancy claim into a stream of encounter-level claims, which changes cash-flow timing as much as it changes coding.

What to do in 2026. Dates of service in 2026 still follow the current global-package rules, so nothing changes for care delivered this year. The preparation worth doing now is inventory: which payer contracts name the global codes explicitly, which EHR order sets and charge masters carry them, how antepartum encounters are currently documented, and whether your E/M documentation for antepartum visits would stand on its own. Practices whose antepartum notes were written knowing nobody would ever code them individually will have the most work to do. Confirm final code numbers against the CPT 2027 Professional Edition before updating any system, and treat Medicare payment values as unsettled until the CY2027 Physician Fee Schedule final rule publishes.

Planning the 2027 transition, or trying to stop global-package denials now? Talk to AMS Solutions — medical billing and revenue cycle management since 1992.