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OB-GYN medical billing services: the global package, the 2027 unbundling, and what to do now
OB-GYN medical billing services manage the strangest payment structure in outpatient medicine: the global maternity package, where roughly thirteen prenatal visits, the delivery, and six weeks of postpartum care all pay as a single bundled claim, months after the work began. Get the package right and obstetric revenue is predictable. Get it wrong and you lose money silently on both sides of the bundle.
And there’s a deadline attached to getting it right, because the package itself is going away.
The global maternity package, explained properly
Most of what makes OB billing different from every other specialty lives inside four CPT codes:
- 59400: routine obstetric care including antepartum care, vaginal delivery, and postpartum care
- 59510: the same package with cesarean delivery
- 59610: vaginal birth after prior cesarean (VBAC)
- 59618: cesarean after an attempted vaginal delivery following prior cesarean
One code, one payment, nine-plus months of care. Per the AMA CPT definition, the package covers uncomplicated maternity cases across three components:
Antepartum care: approximately thirteen routine prenatal visits following the initial confirmation of pregnancy. The standard cadence is monthly through 28 weeks, every two weeks through 36 weeks, then weekly until delivery. Each visit’s history, exam, weight, blood pressure, fetal heart tones, and routine dipstick urinalysis are all inside the bundle.
Delivery: hospital admission, the admission history and physical, labor management, and the delivery itself, including episiotomy and fetal monitoring during labor.
Postpartum care: hospital visits after delivery plus outpatient postpartum care, conventionally through the six-week visit.
Everything in those three paragraphs is paid once, by the global code. Billing any of it separately is unbundling, and it’s a compliance problem, not a revenue strategy.
But here’s the half of the rule that costs practices real money: plenty of legitimate services during pregnancy are NOT in the package, and practices that treat the pregnancy as one undifferentiated bundle donate those services to the payer. Separately billable items include obstetric ultrasounds (76801 and its siblings), laboratory work beyond routine dipstick urinalysis, and, critically, problem visits unrelated to the pregnancy. A pregnant patient who comes in with a UTI gets an E/M visit with modifier 25, billed outside the global. A practice seeing thirty deliveries a month that never bills modifier 25 problem visits is not being conservative. It’s being underpaid.
Where OB revenue actually leaks
After the package basics, three scenarios generate most of the lost revenue in obstetric billing, and all three are rules-knowledge problems.
High-risk pregnancies that stay inside the global. The package assumes an uncomplicated pregnancy and roughly thirteen visits. High-risk patients (gestational diabetes, hypertension, advanced maternal age, multiples) routinely need more. Visits beyond the routine thirteen are separately billable using the antepartum care codes, 59425 for four to six additional visits or 59426 for seven or more, or as individual E/M visits depending on payer policy. The common failure is leaving those extra visits inside the global because nobody is counting. That’s four to eight visits of unbilled revenue per high-risk patient, and high-risk patients are a growing share of every OB panel.
Transfers of care billed as if nothing happened. Patients switch practices mid-pregnancy, move, or deliver with the on-call group. The global code assumes one provider or group furnished everything, so a transfer breaks the package into components: the receiving provider bills the delivery-only code (59409 for vaginal, 59514 for cesarean) plus whatever antepartum visits they furnished, and the referring provider bills antepartum care by visit count. The visit-count ladder matters: one to three visits bill as ordinary E/M codes (99202 to 99215), four to six bill as 59425, seven or more as 59426. Bill the full global after a transfer and the claim either denies or pays and gets clawed back. Bill only the delivery code without the antepartum visits you did furnish and you’ve donated them.
Payer-specific package definitions treated as universal. The global package is a CPT construct, but payers implement it with local rules: different visit thresholds before the global applies, different postpartum windows, Medicaid programs with their own maternity bundling and lactation counseling rules. A billing operation running one rulebook across all payers will be simultaneously unbundling for one payer and underbilling for another.
The pattern across all three: obstetric billing rewards whoever is actually counting. Visits, weeks of gestation (the ICD-10 Z3A codes exist for exactly this), transfer dates, payer thresholds. Counting is unglamorous work, and it’s the entire job.
The 2027 unbundling: the global codes are going away
Now the part that should be driving every OB practice’s vendor conversations this year.
The 2027 CPT restructuring deletes the global maternity codes. 59400, 59510, 59610, 59618, and their relatives are being replaced by individual codes reporting the specific services furnished across pregnancy, delivery, and postpartum care, with routine antepartum and postpartum visits moving to ordinary E/M codes. The stated intent is accuracy: report what happened instead of one bundle that assumes a standard pregnancy.
ACOG has recommended that health plans begin transitioning to individual E/M codes for antepartum visits no later than September 1, 2026. Some payers will move early, some will drag, and for a transition period an OB practice will be billing different structures to different payers for identical care.
Whatever the policy merits, the operational consequences for practices are enormous:
Every antepartum visit becomes a claim. Thirteen visits that used to vanish into one global code become thirteen individually documented, individually coded, individually deniable E/M encounters. Documentation that was never tested claim-by-claim will be tested claim-by-claim.
E/M leveling arrives in obstetrics at scale. Once antepartum visits bill as E/M, they inherit everything that comes with E/M in 2026, including the automatic downcoding programs Cigna and Aetna run against level 4 and 5 visits. Prenatal documentation habits built for a bundled world (brief notes, because the global paid the same regardless) will produce level 2 reimbursement for level 4 work.
Cash flow inverts. The bundled model paid nothing for nine months, then everything at delivery. The unbundled model pays per visit. That’s genuinely better working capital for practices, but only if every visit actually goes out as a clean claim. A practice that submits 92% of its antepartum encounters is taking an 8% pay cut nobody approved.
The transition year is the dangerous part. Payer A moves to itemized billing in late 2026, payer B holds the global until the deadline, payer C publishes contradictory guidance. Getting a patient’s payer, plan, and transition status wrong means unbundling for a payer still on the global (compliance risk) or bundling for a payer that’s moved (lost revenue).
If you take one thing from this guide: any OB billing vendor you talk to this year should raise the 2027 restructuring before you do. If you ask about it and get a blank pause, the evaluation is over.
The nine-month loan, and why vendor pricing suddenly matters
Step back and look at what the global package does to a practice’s finances. The practice delivers care for nine months. The payer pays once, at the end. Functionally, the practice is extending an interest-free loan, patient by patient, for the better part of a year, while paying its own staff monthly.
Now look at what that same structure does to billing vendor incentives.
A percentage-of-collections vendor gets paid when collections arrive. For an obstetric patient, that’s delivery. Which means all the work that protects the eventual global payment (re-verifying eligibility each trimester, because coverage changes mid-pregnancy constantly; securing ultrasound authorizations; tracking visit counts against the high-risk threshold; catching a transfer of care the day it happens instead of at delivery) is cost the vendor carries for nine months before their percentage materializes. Percentage economics tolerate that badly, and the tracking work is exactly what slips.
A per-claim vendor has the opposite distortion: the global package collapses thirteen visits into one claim, so obstetrics generates a fraction of the billable events that the same work would generate in any other specialty. OB practices are structurally unattractive per-claim clients, and it shows in service levels.
A flat fee is indifferent to both problems. The vendor’s revenue doesn’t wait for delivery and doesn’t depend on claim counts, so trimester-by-trimester eligibility work and visit counting are just the job, not unpaid overhead. This is the fourth specialty in this series where the pricing-model analysis lands in a different place for a different mechanical reason, and it’s why Mediflows prices OB-GYN billing flat: obstetric revenue protection is mostly patient-level tracking across nine months, and the pricing model has to make that work rational. It also means the 2027 transition doesn’t reprice your relationship: when thirteen bundled visits become thirteen claims, a per-claim vendor’s invoice roughly-triples, and a percentage vendor’s take rides along. A flat fee stays a flat fee.
What a specialized OB-GYN billing service should be doing
Concretely, the service scope that matches how obstetric revenue actually works:
- Pregnancy-episode tracking, not just claim tracking: every OB patient carried as a nine-month case with visit counts, gestational age coding (Z3A), risk status, and expected delivery window
- Trimester eligibility re-verification, because the coverage a patient had at confirmation is frequently not the coverage she has at delivery
- Global-exclusion capture: ultrasounds, non-routine labs, and modifier 25 problem visits billed as they occur instead of buried in the bundle
- High-risk threshold monitoring with 59425/59426 billing when visit counts justify it
- Transfer-of-care protocols that split the package correctly the day a transfer happens
- Gynecology-side billing run as its own discipline: annual exams, colposcopy, hysteroscopy, LEEP, and surgical gynecology follow standard multi-procedure and global-surgery rules, not maternity rules, and mixing the two mindsets produces errors in both
- Postpartum behavioral health capture: postpartum depression screening and follow-up are billable, clinically essential, and connect obstetric care to the FY2026 ICD-10 behavioral health expansions
- A written 2027 transition plan, payer by payer, with documentation training for providers whose antepartum notes are about to face E/M leveling for the first time
The standard menu applies: percentage of collections (4% to 10%, and note that obstetrics’ delayed collections make the effective service level worse than the headline rate suggests), per-claim ($3 to $10, with the global-package claim-count problem), or flat monthly fee. Weigh any quote against what the leaks cost: one uncaptured high-risk patient is four to eight visits of revenue, one mishandled transfer can be most of a global payment, and a panel’s worth of unbilled modifier 25 visits compounds monthly. In obstetrics more than any specialty in this series, the cheap vendor and the expensive vendor are usually the same vendor, measured at different points in the pregnancy.
The bottom line
Obstetric billing is a counting discipline wrapped around a bundled payment that’s about to stop existing. The practices that come through 2027 whole will be the ones whose billing operation already tracks pregnancies as episodes, already bills the package’s exclusions, and already has a payer-by-payer transition map, and whose vendor economics don’t punish any of that work.
If you want to know where your OB revenue stands, a free revenue audit will show your global-package capture, your high-risk billing rate, and whether your current setup is ready for the unbundling. Call 888-305-4084 or start at the OB-GYN billing services page.
What is the global maternity package in medical billing?
It's the bundled payment structure for routine obstetric care, reported with a single CPT code (59400 for vaginal delivery, 59510 for cesarean, 59610 for VBAC, 59618 for cesarean after attempted VBAC) covering roughly thirteen antepartum visits, the delivery, and about six weeks of postpartum care. Services inside the bundle can't be billed separately; services outside it, like ultrasounds and unrelated problem visits, can and should be.
What is included in CPT 59400?
Routine antepartum care (approximately thirteen visits including histories, exams, weight, blood pressure, fetal heart tones, and routine dipstick urinalysis), admission and management of labor, vaginal delivery including episiotomy, and postpartum care through roughly six weeks. Ultrasounds, non-routine labs, and visits for problems unrelated to the pregnancy are not included.
Are the global OB codes going away?
Yes. The 2027 CPT restructuring deletes the global maternity codes and replaces them with individual codes for the specific services furnished, with routine antepartum and postpartum visits moving to standard E/M codes. ACOG has recommended health plans begin transitioning antepartum billing to individual E/M codes no later than September 1, 2026, so payers are moving on different timelines through the transition.
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