Top 5 OB/GYN Billing Mistakes (And How to Avoid Them)

By Dr. Heather Signorelli, DO, board-certified pathologist and founder of NatRevMD.

Quick answer: The five OB/GYN billing mistakes we see most are billing the full global package after a mid-pregnancy transfer, billing a problem E/M at routine OB visits without modifier 25 and separate notes, missing modifiers on same-day procedures, skipping device and supply codes, and billing postpartum care that never happened.

Introduction

If you run a growing OB/GYN practice, your billing process may be holding you back more than you think. Women’s health providers face unique challenges with global obstetric billing, in-office procedures, pregnancy transfers, and modifier usage. Even small coding errors or missed steps can lead to claim denials, compliance risks, and lost revenue.

Running an OB/GYN practice? One multi-provider OB/GYN group we work with lifted monthly collections 25%, with the first 20% gain inside 60 days. See how our physician-led team handles OB/GYN billing, or get a free billing metric audit.

At NatRevMD, we specialize in OB/GYN medical billing services for practices with 3+ providers or monthly collections over $150,000. We’ve helped dozens of OB/GYN clinics increase revenue by 25% or more within months, simply by cleaning up their billing.

Here are the top five OB/GYN billing mistakes we see every day—and how to fix them.

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1. Incorrect Billing for Pregnancy Transfers

When a patient transfers into or out of care mid-pregnancy, the standard global OB package (e.g., CPT 59400 or 59510) no longer applies. Unfortunately, many practices forget to adjust their billing.

Common Issues:

• Billing full global codes when only partial care was provided
• Missing start/stop dates and prenatal visit counts
• Lack of documentation or transfer letters

Correct Approach:

• Use CPT 59425 (4–6 visits) or 59426 (7+ visits) for partial care
• Document the number of visits and transfer of care date
• Do not bill global OB codes unless your practice provided all prenatal, delivery, and postpartum care

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2. Improper E/M Billing During Routine OB Visits

Can you bill a 99213 or 99214 during a routine prenatal visit? Only if you evaluate and manage a separately identifiable problem (e.g., UTI, bleeding, depression).

Common Issues:

• Missing modifier -25
• No separate documentation for the E/M
• No medical necessity noted

How to Bill Correctly:

• Ensure documentation clearly separates OB care from problem visit
• Use modifier -25 to avoid denials
• Match ICD-10 codes accurately (e.g., Z34.01 for OB + N39.0 for UTI)

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3. Failing to Use Modifiers with In-Office Procedures

Many OB/GYN visits include in-office procedures—colposcopies, IUD insertions, biopsies, etc. Billing an E/M on the same day as a procedure requires precision.

Common Issues:

• Forgetting modifier -25 on the E/M
• Missing modifier -59 or -51 for multiple procedures
• Incorrect diagnosis linking

Best Practices:

• Add modifier -25 to the E/M when medically necessary
• Use modifier -59 for distinct procedural services when appropriate
• Ensure each CPT code is tied to the correct diagnosis

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4. Underbilling In-Office Procedures and Device Insertions

Too often, OB/GYN offices fail to charge for minor procedures or miss revenue from device placements (e.g., Nexplanon, IUDs).

Common Issues:

• No supply/device code billed (e.g., J7307 for Nexplanon)
• Missed combination billing (e.g., 11981 for insertion + device code)
• Documentation missing CPT-specific language

How to Improve:

• Use a charge capture checklist for every visit
• Train staff on procedure codes and proper documentation
• Reconcile procedures monthly to catch missed revenue

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5. Billing for Postpartum Care Not Performed

The global OB code includes routine postpartum care, but only if it occurs. If patients don’t return, you shouldn’t bill for it.

Common Issues:

• Billing postpartum care by default
• No system to track postpartum completion
• Missed E/M billing opportunity if care is outside the global period

Solutions:

• Track delivery dates and confirm postpartum attendance
• If patient doesn’t return, consider billing partial OB codes
• Clearly document any postpartum complications for separate E/M billing

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6. Incomplete or Poor Documentation That Fails Post-Payment Review

Your billing may be correct—but if your documentation doesn’t support it, you could still lose the revenue.

Insurers increasingly request medical records after payment to validate services. If documentation doesn’t meet payer standards for medical necessity, procedures and visits are often denied or recouped—even if they were medically appropriate.

Common Issues:

• No clear history, assessment, or plan for billed E/M visits
• Procedure notes lacking required elements (e.g., consent, findings, complications)
• Global OB notes missing detail on visit count, trimester, or transfer dates
• Documentation that doesn’t justify a modifier -25 or -59 usage

Why It Matters:

When a payer requests records, it’s not enough to have billed correctly—you must prove the care was necessary and documented according to CPT and payer guidelines.

Recoupments can be thousands of dollars—and they hurt even more months after you’ve counted the revenue.

How to Fix It:

• Conduct regular internal audits of documentation vs billing
• Educate providers on documenting medical necessity and procedure-specific details
• Use templated note structures (smart phrases/macros) that still allow customization
• Ensure global OB tracking includes exact visit counts, delivery dates, and postpartum care

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Why Choose NatRevMD for OB/GYN Medical Billing?

At NatRevMD, we provide expert revenue cycle management for OB/GYN practices. Our certified OB coders and experienced account managers understand every nuance of women’s health billing, including:

• Global OB packages and exceptions
• Modifier logic and payer-specific rules
• Denial management and appeals
• Transparent reporting and dashboards
• Front-desk and provider documentation training

We don’t just process claims—we optimize every part of your revenue cycle.

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