Claim denials are already a headache for OB-GYN practices. But a bigger problem is heading straight at them, and most billing teams haven’t connected the dots yet.
Starting January 1, 2027, the way maternity care gets billed is changing completely. At the same time, claim denials across healthcare are already climbing fast. Put those two trends together, and OB-GYN denial management stops being a back-office task. It becomes something executives need to plan for right now, in 2026, before the new rules take effect.
This guide breaks down what’s changing, why it matters, and what practice leaders should do about it.
Why Denials Are Already a Growing Problem
Before we even get to the OB-GYN-specific changes, it helps to understand how bad the denial problem already is across healthcare.
Recent industry data shows Medicare Advantage denial dollars increased by 390% in a single year, and commercial insurance denials rose 176% over the same period. Denials tied to medical necessity and requests for more information jumped 60% in professional billing settings, 28% in outpatient hospital settings, and a striking 123% in inpatient settings.
The financial cost is just as steep. Healthcare providers spend an estimated $19.7 billion every year just managing denied claims, and reworking a single denied claim costs more than $25 on average. That’s before you count the delayed cash flow, the staff hours, and the frustration.
It’s no surprise that revenue cycle leaders are worried. In a recent industry survey, 41% named claim denials as one of their top challenges, and more than three out of four ranked cutting denials as their number one priority for 2026.
This is the environment OB-GYN practices are already operating in, before the biggest coding change to maternity billing in decades even arrives.
What’s Changing: CPT 2027 and the End of Global Billing
For more than 30 years, obstetric care has been billed as one bundled package. A single “global” code covered the antepartum visits, the delivery, and the postpartum checkup, all wrapped into one flat fee.
That system is going away.
Effective January 1, 2027, the American Medical Association is retiring the global obstetric package. In its place, maternity care will be billed in four separate phases:
- Antepartum care — the visits during pregnancy
- Labor management — handling labor, with separate codes for straightforward versus complex cases
- Delivery — billed as its own distinct code, vaginal or cesarean
- Postpartum care — the follow-up visits after birth
To make this happen, CPT 2027 deletes 17 existing codes and introduces 12 new ones. Each phase now needs its own documentation and its own claim. A single note summarizing nine months of care will no longer be enough to support a claim.
This isn’t a routine annual code update. It’s a structural rebuild of how maternity revenue gets captured and, more importantly, how it can get denied.
Why This Will Trigger a Denial Spike in OB-GYN
Here’s the part most practices haven’t fully grasped yet: this change doesn’t just affect coding. It multiplies the number of places a denial can happen.
Under the old global model, a practice submitted one claim per pregnancy. Under the new phase-based model, a practice may submit four or more claims for the exact same patient, each one needing its own proof of medical necessity.
More claims per patient means more chances for a payer to reject one. And payers won’t all move at the same pace. Medicare Administrative Contractors, the regional bodies that process Medicare claims, may issue updated guidance on different timelines. Major commercial payers are also expected to adopt the new phase-based structure at different speeds. That mismatch creates a messy transition window where claim edits, prior authorization rules, and fee schedules simply don’t line up the same way across a practice’s full mix of payers.
Add in the fact that denials are already rising sharply industry-wide, and OB-GYN practices are looking at a compounding problem, not a one-time bump.
A Phase-by-Phase Denial Risk Map
To prepare, it helps to think about where risk shows up in each new phase.
Antepartum care: Since each visit is now billed individually rather than bundled at delivery, documentation needs to justify medical necessity for that specific encounter, not just note that “prenatal care continued.”
Labor management: New codes distinguish straightforward labor from complex labor. Under-documenting complexity, or over-coding a routine labor as complex, both create denial risk in opposite directions.
Delivery: This is the most familiar phase, billed as its own code, but multi-provider deliveries (where one physician handles labor and another handles delivery) introduce new questions about who bills what.
Postpartum care: Like antepartum visits, postpartum follow-ups now need their own encounter-level documentation instead of riding along inside a global fee.
Practices that map their workflows against these four risk points now, in 2026, have a real head start over those who wait until claims start bouncing back in early 2027.
Where AI Denial Prevention Fits In
Here’s the connection almost nobody in this space is making yet. While OB-GYN practices are staring down a coding overhaul, a separate wave of AI-powered denial prevention tools has been quietly maturing across general revenue cycle management.
These tools work by reviewing a claim before it’s ever submitted. They compare it against a payer’s specific rules, flag missing documentation, check that codes match medical necessity requirements, and catch errors while there’s still time to fix them. Organizations using this kind of predictive claim scrubbing have reported denial rate reductions in the 20% to 30% range, along with measurable gains in net revenue.
That capability is a natural fit for exactly the problem CPT 2027 creates. If a single pregnancy now generates four separate claims instead of one, running each of those claims through payer-specific validation before submission isn’t a luxury. It’s the difference between capturing revenue cleanly and drowning in appeals during the first quarter of 2027.
Right now, most AI denial-prevention vendors talk about general revenue cycle problems and never mention CPT 2027. Most OB-GYN billing content talks about CPT 2027 and never mentions AI-powered claim scrubbing. Executives who connect these two threads before their peers do will be the ones with a real advantage.
What Executives Should Do Now
The transition to CPT 2027 isn’t a future problem. The preparation window is happening right now, in 2026. Here’s where to focus:
- Audit documentation habits today. Staff and providers who are still writing one global note per pregnancy need training on phase-specific documentation well before the deadline.
- Ask your billing partner direct questions. Has your claim scrubbing logic already been updated for all 12 new codes? Is there a plan for payer contracts that still reference the retired global codes?
- Track payer-by-payer adoption. Since Medicare contractors and commercial payers won’t move in lockstep, a tracking log through the transition quarter will save real confusion.
- Evaluate predictive claim tools now. Don’t wait until denials start piling up in 2027 to explore AI-powered, pre-submission claim validation. The practices that build this capability during 2026 will have it working smoothly by the time the new codes go live.
- Set up a dedicated tracking category for CPT 2027 denials. Isolating transition-specific denials from routine ones will make it much easier to see exactly where the new structure is creating friction, and to fix it fast.
The Bottom Line
CPT 2027 is not a routine coding update, and treating it like one is the biggest risk facing OB-GYN practices heading into next year. Combined with an industry already seeing sharp increases in denial rates and denial dollars, this is a genuine executive-level revenue priority, not something to hand off quietly to the billing department in December 2026.
The practices that connect the regulatory change to the AI tools already proven to reduce denials elsewhere in healthcare will be the ones protecting their revenue. The ones that wait to react will be the ones explaining a rough first quarter of 2027 to their board.
