OB/GYN Billing 2026 Global OB Packages, Antepartum Coding & Ultrasound Reimbursement

Obstetrics and gynecology practices face some of the most complex billing challenges in all of healthcare. The global obstetric package, antepartum visit coding, high-risk pregnancy management, and obstetric ultrasound reimbursement each carry unique rules that differ from standard E/M billing. A single missed modifier or an incorrectly split global package can cost a practice thousands of dollars per patient over a 9-month maternity cycle.

In 2026, the stakes are even higher. CMS is preparing for the 2027 CPT restructuring of obstetric codes (new codes 59XX1 through 59X12), and ACOG recommends that health plans begin transitioning to individual E/M codes for antepartum visits no later than September 1, 2026. Practices that do not prepare for this transition risk billing disruptions in January 2027.

This guide covers everything your OB/GYN practice needs to know about billing in 2026: the current global OB package structure, antepartum coding rules, ultrasound reimbursement, high-risk pregnancy coding, and the critical steps to prepare for the 2027 overhaul.

Understanding the Global Obstetric Package

The global obstetric (OB) package bundles routine antepartum care, labor and delivery management, and postpartum care into a single reimbursement. This bundled approach simplifies billing for uncomplicated pregnancies but creates significant challenges when complications arise or when care is split between providers.

What the Global Package Includes

Antepartum Care: Approximately 13 routine prenatal visits (initial plus 12 subsequent), including history, physical examination, recording of weight, blood pressure, fetal heart tones, routine urinalysis, and monthly and then weekly visits in the final month.

Delivery: Admission to the hospital, labor management, vaginal delivery (59400) or cesarean delivery (59510), including admission history and physical.

Postpartum Care: Hospital visits following delivery plus the office visit at approximately 6 weeks post-delivery.

Key Global OB CPT Codes

CPT Code	Description	Includes
59400	Routine obstetric care, vaginal delivery	Antepartum + delivery + postpartum
59510	Routine obstetric care, cesarean delivery	Antepartum + delivery + postpartum
59610	Routine OB care after prior cesarean, vaginal delivery (VBAC)	Antepartum + VBAC + postpartum
59618	Routine OB care after prior cesarean, cesarean delivery	Antepartum + repeat C-section + postpartum
59409	Vaginal delivery only	No antepartum or postpartum
59514	Cesarean delivery only	No antepartum or postpartum
59425	Antepartum care only, 4-6 visits	Split care when patient transfers
59426	Antepartum care only, 7 or more visits	Split care with majority of prenatal visits

When to Split the Global Package

The global package must be split when a patient transfers care between providers mid-pregnancy or when fewer than 13 antepartum visits are provided by a single physician. The provider who delivers the baby bills the delivery-only code plus any antepartum visits they provided, while the referring provider bills antepartum-only codes.

Billing Tip: When splitting the package, use 59425 for 4-6 visits and 59426 for 7 or more visits. If fewer than 4 antepartum visits are provided, bill individual E/M codes (99202-99215) instead of the antepartum-only codes.

Antepartum Coding: Current Rules and the 2027 Transition

Current Antepartum Billing (2026)

Under the current system, routine antepartum visits are bundled into the global package and are not billed separately. However, services that go beyond routine care can be billed in addition to the global package using the appropriate E/M code with modifier -25 (significant, separately identifiable evaluation and management service).

When to Bill Separately with Modifier -25

Gestational Diabetes Management: If a patient develops gestational diabetes (O24.410-O24.419) and requires additional counseling, dietary planning, or insulin management beyond routine prenatal care, the additional E/M service can be billed separately.

Preeclampsia Monitoring: Additional visits specifically for blood pressure monitoring, lab work, or NST testing related to preeclampsia (O14.0-O14.9) are separately billable.

High-Risk Pregnancy Conditions: Conditions such as placenta previa (O44), preterm labor (O60), cervical incompetence (O34.3), or multiple gestation (O30) that require additional management beyond routine antepartum care.

ACOG's 2027 Transition Recommendation

The AMA CPT Editorial Panel has accepted new obstetric codes (59XX1 through 59X12) effective January 1, 2027, which will replace much of the current global OB package structure. ACOG recommends that health plans begin the transition from global obstetric payment by allowing E/M codes (99202-99499) without limitations or preauthorization for antepartum visits.

Critical Action Item: ACOG recommends appending the HCPCS modifier TH to differentiate maternity-related E/M visits. Practices should begin using modifier TH on antepartum E/M claims no later than September 1, 2026, to ensure payers recognize the transition.

What This Means for Your Practice: By Q4 2026, your billing team should be testing TH modifier acceptance with your top payers. Practices that wait until January 2027 risk weeks of claim rejections during the transition period.

Essential ICD-10 Codes for OB/GYN Billing

Routine Pregnancy Supervision

ICD-10 Code	Description	Use Case
Z34.01	Supervision of normal first pregnancy, 1st trimester	Nulliparous patient, weeks 1-13
Z34.02	Supervision of normal first pregnancy, 2nd trimester	Nulliparous patient, weeks 14-27
Z34.03	Supervision of normal first pregnancy, 3rd trimester	Nulliparous patient, weeks 28-40
Z34.81	Supervision of other normal pregnancy, 1st trimester	Multiparous patient, 1st trimester
Z34.82	Supervision of other normal pregnancy, 2nd trimester	Multiparous patient, 2nd trimester
Z34.83	Supervision of other normal pregnancy, 3rd trimester	Multiparous patient, 3rd trimester
O09.891	Supervision of high risk pregnancy, 1st trimester	AMA, prior complications, etc.
Z3A.xx	Weeks of gestation (Z3A.01-Z3A.42)	Always report as secondary code

High-Risk Pregnancy Conditions

ICD-10 Code	Description
O24.410	Gestational diabetes, diet controlled
O24.414	Gestational diabetes, insulin controlled
O13.1-O13.3	Gestational hypertension without proteinuria (by trimester)
O14.00-O14.03	Mild to moderate preeclampsia (by trimester)
O14.10-O14.13	Severe preeclampsia (by trimester)
O44.00-O44.13	Placenta previa (by trimester, with/without hemorrhage)
O30.001-O30.009	Twin pregnancy, dichorionic/diamniotic
O60.00-O60.03	Preterm labor without delivery (by trimester)

Coding Tip: Always report the weeks of gestation code (Z3A.xx) as a secondary diagnosis on every obstetric claim. This is required for accurate trimester-specific coding and helps payers process claims correctly.

 

 

Obstetric Ultrasound Reimbursement

Obstetric ultrasound is one of the most commonly billed procedures in OB/GYN, but reimbursement varies significantly based on which code is selected, whether the scan is performed in the office or at an imaging center, and whether the professional and technical components are billed separately.

Key Ultrasound CPT Codes

CPT Code	Description	Work RVU (TC)	Typical Use
76801	OB US, < 14 weeks, single fetus	2.41	1st trimester dating/viability scan
76802	OB US, < 14 weeks, each additional fetus	0.86	Twins/multiples add-on
76805	OB US, >= 14 weeks, single fetus	2.97	Anatomy scan (18-22 weeks)
76810	OB US, >= 14 weeks, each additional fetus	1.47	Anatomy scan add-on for multiples
76811	OB US, detailed fetal anatomic exam, single	3.50	High-risk detailed anatomy
76812	OB US, detailed fetal anatomic exam, add'l fetus	1.80	High-risk multiples add-on
76813	OB US, nuchal translucency, 1st trimester, single	1.58	NT screening (11-14 weeks)
76815	OB US, limited (e.g., fetal heartbeat, position)	0.65	Quick check, non-diagnostic
76816	OB US, follow-up/repeat	1.28	Growth check, follow-up
76817	OB US, transvaginal	1.35	Cervical length, early pregnancy
76818	Fetal biophysical profile with NST	1.70	High-risk surveillance
76819	Fetal biophysical profile without NST	1.20	Biophysical profile only

Professional vs. Technical Component Billing

Global Billing (No Modifier): When the OB/GYN practice owns the ultrasound equipment and performs both the scan and the interpretation, bill the code without any modifier. This captures both the technical component (TC) and the professional component (26).

Modifier -TC (Technical Component): Used when the practice performs the scan but an outside radiologist interprets the images. The practice bills with -TC and the interpreting physician bills with -26.

Modifier -26 (Professional Component): Used when the physician only reads and interprets the images but did not perform or supervise the scan.

Common Ultrasound Billing Errors

Error 1: Billing 76805 (complete anatomy scan) for a follow-up growth check. If the full anatomy was already completed earlier in the pregnancy, subsequent scans should use 76816 (follow-up) unless a new complete examination is medically necessary and documented.

Error 2: Failing to document medical necessity for repeat ultrasounds. Many payers limit the number of covered ultrasounds per pregnancy. Each scan must have a documented clinical indication (growth restriction suspicion, bleeding, etc.).

Error 3: Not billing the add-on code for multiple fetuses. When scanning twins, always bill 76801 + 76802 (or 76805 + 76810). Missing the add-on code leaves significant revenue on the table.

NCD Reference: NCD 220.5 -- Ultrasound Diagnostic Procedures governs Medicare coverage for diagnostic ultrasound, including obstetric applications.

Top 5 OB/GYN Denial Triggers and How to Prevent Them

1. Global Package Unbundling Denials

Payers deny claims when practices bill separately for services included in the global OB package. Ensure your team knows exactly which services are bundled (routine labs, routine visits, fetal heart tones) and which require separate billing (non-routine conditions, additional E/M with modifier -25).

2. Incorrect Trimester Coding

ICD-10 obstetric codes are trimester-specific. Billing O24.410 (gestational diabetes, 1st trimester) when the patient is at 30 weeks will result in a denial. Cross-reference the gestational age with the trimester-specific code on every claim.

3. Missing Weeks of Gestation Code

Failure to include Z3A.xx as a secondary diagnosis is a common cause of denials, especially for ultrasound and high-risk services. Automate this in your EHR to prevent human error.

4. Ultrasound Frequency Limits

Most commercial payers limit the number of covered ultrasounds per uncomplicated pregnancy (typically 2-3). Additional scans require documentation of medical necessity and may need prior authorization. Build payer-specific ultrasound limits into your charge capture workflow.

5. Split Care Documentation Gaps

When a patient transfers care mid-pregnancy, incomplete documentation of the number of antepartum visits provided leads to denials for both the transferring and receiving provider. Maintain a visit count log in the patient chart and communicate exact visit numbers during the transfer.

Preparing Your Practice for the 2027 CPT Overhaul

The 2027 restructuring of obstetric CPT codes (59XX1-59X12) represents the most significant change to OB/GYN billing in decades. Here is your quarterly action plan:

Q2 2026 (Now)

• Audit your current global OB billing volume and revenue
• Identify your top 5 payers and contact them about TH modifier acceptance
• Train billing staff on individual E/M coding for antepartum visits

Q3 2026

• Begin appending modifier TH to antepartum E/M claims per ACOG recommendation

• Test claims with top payers to verify acceptance before the September 1 deadline
• Update EHR templates to support both global and unbundled billing workflows

Q4 2026

• Map current CPT codes to the new 59XX1-59X12 code structure

• Update charge masters and fee schedules for January 1, 2027 go-live

• Conduct a mock billing cycle using the new codes to identify workflow gaps

 

Let 24/7 MBS Handle Your OB/GYN Billing

OB/GYN billing requires specialty-specific expertise that general billing teams often lack. From global package management to ultrasound reimbursement optimization, 24/7 Medical Billing Services has the certified coders and dedicated account managers to maximize your practice revenue while minimizing denials.

Our OB/GYN billing specialists understand the nuances of split care billing, trimester-specific coding, and payer-specific ultrasound limits. We are already preparing our clients for the 2027 CPT transition so their revenue cycle is uninterrupted.

Frequently Asked Questions

1. What is included in Global OB Packages in OB/GYN billing?

Global OB packages include all routine prenatal visits, delivery, and postpartum care under one bundled payment. It helps simplify billing but requires correct documentation of included and excluded services.

2. How is antepartum care coded in OB/GYN billing?

Antepartum care is coded based on the number of visits provided before delivery. CPT codes like 59425 and 59426 are commonly used depending on whether care is partial or full prenatal management.

3. Are ultrasounds included in global OB packages?

Not always. Only medically necessary ultrasounds outside routine prenatal care are separately reimbursable. Proper modifier usage and documentation are essential for approval.

4. What are common billing mistakes in OB/GYN global packages?

Common errors include incorrect visit counts, missing documentation, improper modifier usage, and billing separately for services already included in the global package.

5. How can OB/GYN practices improve reimbursement in 2026?

Practices can improve reimbursement by accurate coding, timely claim submission, proper use of modifiers, verifying payer policies, and reducing documentation errors in global OB billing.