CPT 59400 Explained: Description, What's Included and Billing Rules

59400 is the code most obstetric practices know by heart — and the single most valuable code on many practices' fee schedules. It's also the code most often billed when it shouldn't be, and not billed when it should. This guide covers exactly what 59400 includes, when to use something else, how and when to bill it, and what happens to it on January 1, 2027.

CPT 59400 description

CPT 59400: Routine obstetric care including antepartum care, vaginal delivery (with or without episiotomy, and/or forceps) and postpartum care.

It's a global (package) code: one code, one claim, one payment covering the whole course of routine maternity care for a vaginal delivery by one physician or group.

What's included in 59400

Per the CPT maternity care guidelines, the package includes:

Antepartum care

• Initial and subsequent history and physical examinations
• Recording of weight, blood pressure and fetal heart tones
• Routine chemical urinalysis
• Routine visits — typically monthly up to 28 weeks, biweekly to 36 weeks, and weekly until delivery

Delivery

• Admission to the hospital and the admission history and physical
• Management of uncomplicated labor
• Vaginal delivery, with or without episiotomy and/or forceps
• Delivery of the placenta

Postpartum care

• Hospital visits after delivery
• Routine office visit(s) following vaginal delivery

What's NOT included in 59400

Services outside routine care are billed separately — and missing them is one of the most common sources of lost obstetric revenue:

Whether a complication visit is separately billable depends on the payer. Many follow the principle that problems beyond routine care are separately reportable when documented with diagnoses that show the complication; some Medicaid programs have their own rules.

When NOT to use 59400

59400 only fits when the same physician or group provided all three components and the baby was delivered vaginally without a previous cesarean. Use something else when:

See our detailed guides on 59409 vs 59410 and split maternity care billing.

When and how to bill 59400

• Date of service: most payers expect the delivery date. Some want a date span from the first antepartum visit to delivery or the postpartum visit. Follow the payer's manual.
• Timing: many practices bill after delivery; some wait for the postpartum visit. Waiting too long risks commercial timely-filing limits, so know each payer's deadline.
• Notification: some Medicaid programs and plans require a pregnancy notification or first-visit claim (sometimes with modifier TH) early in the pregnancy. See our guide to the TH modifier.
• Track visits throughout: keep a running count of antepartum visits and payer at each visit. If the pregnancy doesn't end with your practice delivering, you'll need that count to bill the right component code.

Diagnosis codes on a 59400 claim

• Principal diagnosis: the main circumstance or complication of the delivery. For a full-term, uncomplicated delivery of a single liveborn infant with no complications, O80 is used — alone, with no other Chapter 15 codes.
• Z3A.__ — weeks of gestation at delivery.
• Z37.__ — outcome of delivery, required on every delivery claim (for example Z37.0, single live birth).
• Relevant conditions that complicated the pregnancy or delivery — see our ICD-10 O codes guide.

Twins and 59400

For a vaginal delivery of twins, many payers expect 59400 for the first baby and 59409 with modifier 51 or 59 for the second. Others want modifier 22 on a single code. Policies differ, so check each payer.

Modifier 22 on 59400

Modifier 22 (increased procedural services) may be appropriate for deliveries requiring substantially more work than usual — but it must be supported by documentation describing the additional work. Payers frequently reduce or deny 22 without it.

Common 59400 errors

1. Billing 59400 for a VBAC — should be 59610.
2. Billing 59400 after a transfer-in — the practice didn't provide all antepartum care.
3. Billing the global to the plan active at delivery when another plan covered most of the pregnancy.
4. Separately billing routine prenatal visits that are already in the global — producing CO-97 denials. See our guide to the CO-97 denial code.
5. Missing separately billable services — ultrasounds, NSTs, complication visits.
6. Missing Z37 or using O80 with other O codes.
7. Holding the claim too long after delivery.

59400 and global period tracking

Medicare's Physician Fee Schedule lists maternity codes with the global indicator MMM, meaning the standard surgical global days don't apply; the maternity guidelines define what's included. Internally, practices should still track each pregnancy's "global window" — from the first antepartum visit through the postpartum visit — to prevent routine visits from being billed separately and to catch transfers and insurance changes.

The end of 59400: January 1, 2027

The AMA's CPT 2027 code set deletes 59400 (along with the rest of the global and component maternity codes) for dates of service on or after January 1, 2027. A routine vaginal pregnancy will instead be reported as:

• Prenatal visits → E/M codes, per encounter
• Labor → 59080–59083, per day
• Vaginal delivery → 59431 (or 59432 after a previous cesarean)
• Postpartum care → included on the delivery date; later hospital days and office visits reported with E/M codes

Patients whose pregnancies span the change will need careful handling. Read our 2027 maternity transition guide and our explainer on the 2027 delivery codes.

Get your OB claims reviewed

59400 and its related codes represent a large share of obstetric revenue. Our global maternity billing service tracks every pregnancy from the first visit and checks every delivery claim before it goes out. Send us a WhatsApp message for a free review.