OB/GYN billing
Almost every other specialty bills an encounter and moves on. Obstetrics bills an episode: the total obstetric package covers antepartum care, the delivery and postpartum care under one code, submitted once, after the birth. That single structural fact reshapes eligibility, accounts receivable, timely filing and what happens when a patient transfers care -- and none of it applies to the gynecology half of the same practice.
- The total obstetric package bundles antepartum, delivery and postpartum care into one charge
- Maternity procedures carry their own Medicare global-period indicator, MMM
- Care that is split between practices unbundles into antepartum-only, delivery-only and delivery-with-postpartum components
- Gynecology bills per encounter, so one practice runs two different revenue cycles
This is an educational guide to how billing works for obstetrics and gynecology — its workflow, coding, and payer considerations. It is general information, not a statement that US Medical Billing serves this specialty, and not billing, coding, or legal advice.
What makes OB/GYN billing distinct
The defining feature is the global obstetric package. CMS states in its National Correct Coding Initiative policy manual that the total obstetrical packages include antepartum care, the delivery and postpartum care -- one code, one charge, one submission. Routine visits across the pregnancy generate no separate claim; the practice provides months of care before the encounter that triggers a bill exists. This is not a bundling edit that can be worked around with a modifier. It is how the code is built.
Medicare recognizes this as its own payment category rather than folding it into surgery. Maternity procedures are assigned a global period indicator of MMM on the Physician Fee Schedule Database -- not 000, 010 or 090. Some maternity procedures, a cesarean delivery among them, behave like ordinary surgical procedures and are subject to the same global surgery and anesthesia rules, and the same services are bundled into the MMM group that are bundled into the day-count global periods. But the indicator is separate because the episode is not measured in days after an operation; it is measured across a pregnancy.
What the package excludes matters as much as what it includes. CMS names ultrasound, amniocentesis, special screening tests for genetic disorders, visits for conditions unrelated to the pregnancy, and additional frequent visits made necessary by a high-risk condition as services outside the package. Meanwhile services that look separately billable are inside it: fetal monitoring during labor, episiotomy and delivery of the placenta are included in the delivery codes, and antepartum care includes urinalysis. Getting either direction wrong produces a denial, and they fail in opposite ways.
How OB/GYN billing flows
An obstetric revenue cycle is a months-long hold followed by a single high-value claim, with a parallel per-encounter gynecology cycle running alongside it. The controls below are what keep the held episode intact.
Pregnancy confirmation and benefit verification
Coverage, maternity benefits, any authorization requirement and the patient's cost share are established at the start of care rather than at delivery, because the episode is billed months later and by then a coverage problem is nine months old. Where the patient is on Medicaid, the eligibility category is confirmed, since pregnancy is its own basis for coverage in many states.
Common operational challenges
Nearly all the difficulty in obstetric billing comes from the length of the episode: decisions made in the first trimester are only tested at the point the claim goes out.
Carrying an episode in accounts receivable
No charge exists for routine antepartum care until the delivery is billed. The work is done, the cost is incurred, and the receivable does not appear -- which makes standard A/R aging blind to the largest thing the practice is owed.
Keeping the in-package and out-of-package lists straight
Ultrasound, genetic screening and high-risk visits are outside the package; fetal monitoring in labor, episiotomy and placenta delivery are inside it. Both errors are common and they are opposite errors -- one loses revenue, the other creates an unbundling exposure.
Coverage that changes mid-pregnancy
Plans, employers and Medicaid eligibility can all change across nine months. The episode is billed under whatever coverage applies at delivery, so a change that went unnoticed in month four surfaces as a denial on the single claim that carries everything.
Splitting care between practices
Transfers, covering physicians and patients who move mean the package frequently cannot be billed as a package. Establishing which components this practice actually provided -- and which another practice will bill -- is a records question before it is a coding one.
Documentation and coding considerations
Obstetric coding is largely a question of scope: what the package covers, what it excludes, and what this practice actually did. The CPT code set is maintained by the American Medical Association; the notes below describe documentation considerations rather than reproduce any code descriptions.
The package codes and their components
Each route of delivery has a family: routine care with delivery, delivery only, and delivery with postpartum care -- 59400/59409/59410 for vaginal delivery, 59510/59514/59515 for cesarean, and 59610/59612/59614 and 59618/59620/59622 where there has been a previous cesarean. Which member of the family is reported is decided by how much of the episode the practice provided.
What is inside the delivery
CMS states that fetal monitoring during labor (59050, 59051), episiotomy (59300) and delivery of the placenta (59414) are included in the delivery codes and are not separately reportable, and that antepartum care includes urinalysis. Wound repair codes are not used to close a surgical incision on a procedure carrying the MMM global indicator.
What is outside the package
Ultrasound, amniocentesis, special screening tests for genetic disorders, visits for conditions incidental to the pregnancy, and additional frequent visits required by a high-risk condition are named by CMS as services the package does not include. Each needs documentation that establishes why it was not routine antepartum care.
Gynecologic screening on its own rules
The non-obstetric side follows separate coverage logic. Medicare pays for a screening pelvic examination including a clinical breast examination at a defined interval, more often where documented high-risk factors or childbearing-age criteria in 42 CFR 410.56 apply -- so a screening interval, not a diagnosis, decides whether the service is payable.
Denial and rejection risks
Obstetric denials are unusually expensive, because one denial is the whole episode. Most of them are caused months before the claim exists.
A package billed when care was split
Reporting the total package when another practice provided part of the antepartum or postpartum care produces a duplicate or overlapping claim. Sorting it out afterwards means reconstructing who saw the patient when, across the whole pregnancy.
Coverage lapse discovered at delivery
Because nothing is submitted during the antepartum period, a coverage change is not surfaced by a rejected claim the way it would be in a per-encounter specialty. The first signal is the episode claim itself, by which point the care is complete.
Separately billed services that are inside the package
Fetal monitoring in labor, episiotomy, placenta delivery and routine antepartum urinalysis are components of codes the practice has already billed. Reporting them again is unbundling, and it is visible on the same claim.
Timely filing measured from the wrong date
The filing clock on the package runs from the claim's date of service, not from the first antepartum visit -- but a practice that holds the claim while chasing records can still run a long way into the window before it submits, with no earlier claim to prove the episode began.
Payer-process considerations
Maternity is the one service line where a large share of volume sits with Medicaid regardless of the practice's overall payer mix, and Medicaid's rules for pregnant patients are not the rules for everyone else.
Medicaid's protected pregnancy eligibility
Federal rules give pregnant enrollees extended and continuous eligibility: coverage continues through the last day of the month in which the postpartum period ends, and a change in household income during the pregnancy does not end it. That is a materially different eligibility model from the one re-verification normally assumes.
State-by-state Medicaid maternity rules
Medicaid is administered by each state, so which components of the package a state expects to see reported, and how, is a state-plan question. The same clinical episode can be billed differently in two states.
The MMM global indicator
Maternity procedures sit outside the 000/010/090 day-count global periods with an indicator of their own. Some of them nonetheless behave like surgery for bundling and anesthesia purposes, so payer edits derived from surgical global rules can and do apply.
Preventive gynecologic frequency limits
Screening pelvic and breast examinations are subject to interval limits with defined exceptions for high-risk patients and patients of childbearing age. A service delivered before the patient is eligible again is reduced or shifted to the patient rather than denied outright.
Revenue-cycle checkpoints
Because the episode is billed once, these checkpoints are the only opportunities to catch a problem while it is still cheap.
- Verify maternity benefits, authorization and Medicaid eligibility category at the start of care, not at delivery
- Re-verify coverage at intervals through the pregnancy, and treat a change as an event rather than a note
- Flag every service that falls outside the package -- imaging, genetic screening, amniocentesis, unrelated and high-risk visits -- as it happens
- Record which practice provided each component of the episode, so a split can be billed as components rather than as a package
- Confirm no component already inside the delivery or antepartum codes is being reported a second time
- Track the single episode claim individually after submission rather than leaving it in the general follow-up queue
Related & connected
Services, tools, background reading and definitions that connect to the obstetric and gynecologic revenue-cycle steps above.
Related services
- Eligibility & verificationVerifying maternity benefits at the start of care and re-verifying coverage across a months-long episode.
- Coding supportPackage selection, component billing where care is split, and keeping in-package services off the claim twice.
- A/R managementFollowing a single high-value episode claim rather than letting it age in a general worklist.
Calculators & tools
- Patient eligibility verification checklistWork through the coverage checks that have to hold at the start of an obstetric episode and again during it.
- Days in A/R calculatorSize how long money sits outstanding -- the metric an episode-billed service line distorts most.
- Medicaid claim readiness checklistConfirm a Medicaid claim carries what the state programme expects before it goes out.
From the Knowledge Base
- Re-verifying recurring patientsWhy coverage is checked repeatedly across a course of care, and what changes between checks.
- Medicaid eligibility categoriesHow Medicaid eligibility is grouped, including the pathways that cover pregnancy.
- Timely filing denialsHow filing deadlines are measured and what evidence rebuts a timely-filing denial.
Glossary
- Global periodThe window in which follow-up care is already paid for by the procedure code.
- Bundled paymentOne payment covering a defined set of services, of which the obstetric package is the clearest outpatient example.
- Timely filingThe deadline for submitting a claim, measured from the date of service.
- Benefit verificationEstablishing what a plan actually covers, as opposed to whether the patient is enrolled.
Frequently asked questions
What does the global obstetric package actually include?
CMS describes the total obstetrical packages as including antepartum care, the delivery and postpartum care. Routine antepartum visits are not billed separately -- they are part of the code reported after delivery. The package specifically does not include ultrasound, amniocentesis, special screening tests for genetic disorders, visits for conditions unrelated to the pregnancy, or the additional frequent visits a high-risk pregnancy requires.
What happens if a patient transfers care mid-pregnancy?
The package is not reported, because no single practice provided the whole episode. Each practice reports the components it actually delivered instead -- antepartum care only, delivery only, or delivery with postpartum care. That means the practices need a shared record of who saw the patient when, and it is the most common source of overlapping obstetric claims.
Why do maternity procedures have a different global period?
On the Medicare Physician Fee Schedule Database, maternity procedures carry a global period indicator of MMM rather than 000, 010 or 090 days, because the episode of care is not defined by a number of days after an operation. Some maternity procedures still behave like surgery -- a cesarean delivery, for example -- and the same services bundled into day-count global periods are bundled into MMM procedures.
How is obstetric eligibility different from ordinary eligibility?
For Medicaid enrollees the rules are unusually protective: federal regulation provides extended and continuous eligibility for a pregnant enrollee through the last day of the month in which the postpartum period ends, and coverage is not lost because household income changed during the pregnancy. Commercial coverage carries no such protection, which is why the episode's eligibility has to be re-checked rather than assumed.
Sources
Last reviewed July 31, 2026.
- Centers for Medicare & Medicaid Services (CMS)National Correct Coding Initiative Policy Manual, Chapter VII (Maternity Care and Delivery) -- package contents, bundled intrapartum services, and the MMM global indicator
- Electronic Code of Federal Regulations (eCFR)42 CFR 410.56 -- conditions for and limitations on coverage of screening pelvic examinations
- Electronic Code of Federal Regulations (eCFR)42 CFR 435.170 -- extended and continuous Medicaid eligibility for pregnant enrollees
- American College of Obstetricians and Gynecologists (ACOG)Coding and practice-management guidance for obstetrics and gynecology
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