2027 Maternity CPT Code Updates: How to Protect Revenue When Pregnancies Cross Into the New Year

A patient starts prenatal care in November 2026 and is due in February 2027. Her chart is full of visits billed under the old rules, and her delivery will fall under new ones. The global code your system uses today, 59400, does not exist in the 2027 code set. Without a plan, visits get counted wrong, claims reject, and revenue stalls.

The 2027 maternity CPT code updates are the largest restructuring of obstetric billing in decades. This guide covers what the AMA actually changed, how to bill pregnancies that cross January 1, and what to do before the transition. Code details are summarized, so rely on the licensed CPT 2027 manual.

What Changes in the 2027 Maternity CPT Code Set?

Per the AMA, CPT 2027 deletes 17 maternity codes, adds 12, and revises six. Care is reported in four phases: antepartum, labor management, delivery, and postpartum.

Full lists are in the AMA code and guideline PDF. Antepartum and postpartum E/M rules follow standard E/M guidelines. Medicare adopted the AMA codes in its final 2027 fee schedule, and CMS’s proposed alternative G-codes were not finalized, per ACOG. Medicaid and commercial plans may differ, so check each payer. This is a CPT update. ICD-10-CM, payer policy, and payment changes are separate.

What Happens When a Pregnancy Crosses From 2026 Into 2027?

The pregnancy start date does not decide the code set. Each service follows the rules in effect for its date of service. The AMA’s transition FAQ says:

•      Antepartum visits in 2026: 4–6 visits are reported with 59425, 7 or more with 59426, and 3 or fewer with individual E/M codes. Visits in 2027 are reported with E/M codes. A patient seen in both years can have both.

•      Delivery in 2026: report the 2026 global code, even if postpartum care happens in 2027. Postpartum services on or after January 1, 2027 are reported with E/M codes, and AMA transition guidance also cites the HCPCS modifier TH.

•      Delivery in 2027: use the new delivery and labor management codes. Labor that starts December 31 and continues January 1 depends on whether it was a continuous visit.

•      Timing: 2026 antepartum claims need not wait for delivery. The AMA suggests submitting once the 2026 visit count is certain.

Payers may add their own transition rules, so confirm before billing. Sirius does not give a universal answer where payer policy applies.

2026 vs. 2027 Maternity Billing: What to Review

Global Maternity Billing: Where Revenue Can Be Lost

Until January 1, the global package covers antepartum care, delivery, and postpartum care, and transfers of care are common. In 2027, separate phases make team-based care easier to bill but demand better records. Example, with a payer-specific caveat: a patient moves to your practice at 34 weeks. Your practice may bill only the services it furnished. Antepartum E/M visits require documentation that stands alone, rather than relying on a prior practice’s records. Incomplete prenatal care, multiple providers, and mismatched records are the usual sources of leakage.

Five Common Maternity Billing Mistakes During the Transition

How to Protect OB/GYN Revenue During the 2027 CPT Transition

These are internal workflow suggestions. The only fixed date is the January 1, 2027 effective date of the code set. Train staff on E/M documentation, since MDM or time now supports each prenatal and postpartum visit.

Is Your OB/GYN Practice Ready for the 2027 CPT Transition?

☐ Updated 2027 CPT references

☐ Reviewed maternity billing policies

☐ Identified pregnancies crossing January 1

☐ Audited open global maternity claims

☐ Verified antepartum documentation

☐ Reviewed delivery coding procedures

☐ Checked postpartum billing requirements

☐ Updated billing software

☐ Reviewed payer-specific policies

☐ Trained billing staff                     

Completed: ____ of 10 (multiply by 10 for your percentage). Completion does not guarantee correct billing or full reimbursement.

Test Your Understanding: A Pregnancy That Crosses Into 2027

A patient begins prenatal care in November 2026 and delivers in February 2027.

Revenue Leakage Warning Cards

How Sirius Solutions Global Helps OB/GYN Practices Protect Maternity Revenue

Sirius Solutions Global offers medical billing, medical coding, eligibility verification, claims and denial management, A/R follow-up, credentialing and re-credentialing, prior authorization, billing audits, and revenue leakage assessments. We help healthcare practices strengthen their billing workflows through technology-assisted processes and experienced human oversight, which matters when a transition creates unusual cases. We do not claim OB/GYN-specific results or guarantee reimbursement or the elimination of denials.

How Prepared Is Your Practice for the 2027 Maternity Billing Transition?

Educational only, not a compliance audit or guarantee. Request a Medical Billing and RCM Review.

Frequently Asked Questions

▸ What are the 2027 maternity CPT code updates?

CPT 2027 deletes 17 maternity codes, adds 12, and revises six, replacing global packages with separate reporting of four phases.

▸ Do maternity CPT codes change every year?

Many CPT codes change annually, but 2027 is an unusually large restructuring for maternity.

▸ What if prenatal care starts in 2026 and delivery is in 2027?

Antepartum visits follow the 2026 rules in 2026 and E/M rules in 2027. Delivery follows the 2027 codes.

▸ Which code set applies to a pregnancy crossing January 1?

Each service uses the code set for its date of service, not the pregnancy start date.

▸ Does the global package still include antepartum, delivery, and postpartum care?

For 2026 services, yes. In 2027 the global codes are deleted.

▸ When are antepartum-only codes used?

59425 and 59426 apply to 2026 visits when there were four or more. In 2027 antepartum visits use E/M codes.

▸ What is the difference between 59400 and 59510?

Global vaginal versus global cesarean packages. Both are deleted for 2027.

▸ How does transfer of care affect billing?

In 2027, each practice can report the phases it furnished. Payers may add rules, so confirm.

▸ Why are maternity claims denied?

Outdated codes, wrong date-of-service logic, unsupported E/M documentation, and payer-specific edits.

▸ How can practices prevent leakage during the transition?

Update code libraries, reconcile open episodes, train staff, and monitor denials and payments.

▸ Can a billing company help review global maternity claims?

Yes. A review can check code mapping, open episodes, and payment variances.

▸ How can Sirius Solutions Global support OB/GYN billing workflows?

Through coding support, claims and denial management, audits, and A/R follow-up. We do not claim OB/GYN-specific results.

Editorial note: Coding rules and payer policies are still being clarified before January 1. Verify everything against the licensed CPT 2027 manual, AMA guidance, and each payer’s policy. Technical content like this benefits from review by a certified coder.

Disclaimer: This article is educational, published by Sirius Solutions Global, and is not a substitute for the CPT manual, official guidance, payer policies, or qualified coding advice. CPT® is a registered trademark of the AMA, and code descriptions here are summarized. Sirius Solutions Global is not affiliated with the AMA, ACOG, or CMS. Nothing here guarantees coverage, reimbursement, or audit outcomes.