2027 CPT Code Changes: What Billing Teams Should Update Before January

What changes in CPT on January 1, 2027?

For most billing teams the change that matters is maternity care: the 2027 CPT set takes obstetric care out of one global package and splits it into separately reported phases from January 1, 2027^1,2. Everything else in the annual update reaches you the usual way, through code files, fee schedules and payer edits.

Medicare’s side is settled. CMS’s CY 2027 physician fee schedule final rule takes effect January 1, 2027 and adopts the new maternity codes¹. CMS issued it on November 4, 2026, with conversion factors of $32.95 for qualifying APM participants and $32.63 for everyone else⁴.

A headline count of new and deleted codes won’t tell you much. Run last year’s charge history against the 2027 files and you get the list that matters: the codes you bill that moved. That review is core medical coding work for November.

How does the maternity care restructure change OB billing?

It ends the single global code for a pregnancy. Under the old structure, 12 prenatal E/M visits were bundled into 59400, 59510, 59610 and 59618; for 2027 the maternity family deletes 17 legacy codes, creates 12 and revises 9, moving from the maternity global period to individual codes¹.

What takes the bundle’s place, in plain terms¹:

• Prenatal and postpartum visits are reported as E/M visits. CMS sets no cap on how many can be billed but expects ACOG’s guidelines to be followed, and those describe 8 visits for an average-risk pregnancy and 13 for a higher-risk one.
• Labor has per-day codes, 59080 through 59083, split by first day or later day and by straightforward or complex management.
• Delivery has its own codes: 59431 and 59432 for vaginal delivery, the second after a prior cesarean, and 59502 and 59503 for a primary and a repeat cesarean.
• Several procedures have their own codes in the family, including third- and fourth-degree laceration repair (59433, 59434), hysterectomy after cesarean (59504) and uterine tamponade (59623).

The billing consequence is timing. A global claim waited for the delivery. A visit-by-visit structure lets each prenatal visit go out once it’s documented, which brings cash in earlier and puts more lines on every patient’s account. It also runs each visit through eligibility, copay and denial edits that one global claim met only once.

Medicare adopted the codes and didn’t create the 15 HCPCS G-codes it had floated to keep the old global structure¹. It set labor and delivery work RVUs about 15% above the RUC’s recommendation¹. CMS says the coding change doesn’t alter cost-sharing or claim denial policy¹. But each commercial plan applies its own benefit design to the new visit lines, so ask. The OB-GYN billing page covers the specialty’s denial patterns, and the global surgical period entry explains how global packages work elsewhere.

How do you bill a pregnancy that starts in 2026 and delivers in 2027?

By each payer’s business rule. HHS issued an enforcement discretion on October 30, 2026 that lets HIPAA covered entities use the 2026 maternity codes for billing and payment between January 1, 2027 and December 31, 2027, for episodes that start in 2026². Payers and health plans may issue business rules before January 1 saying when and how those codes can be used outside their valid date range².

So the flexibility isn’t automatic. HHS only promises not to take HIPAA enforcement action against entities that follow those payer rules, which it wants phased out as soon as operationally feasible in 2027². CMS’s fee schedule rule defers to AMA and ACOG guidance on billing these pregnancies¹. If a plan issues no rule, don’t guess. Get its answer in writing before the first 2027 delivery claim.

Which 2027 cycle codes are already in effect?

Some went live weeks ago. The AMA releases Category III codes three times a year: in April for July, in July for October and in October for January³. CMS’s October 2026 outpatient update put 58 new Category III codes, 1054T through 1111T, and 39 new PLA codes, 0660U through 0698U, into effect on October 1, 2026³.

A practice that loads codes only in January is already a quarter behind on those, and a charge master without the code forces a workaround on every claim that needs it.

What about AI and algorithm-based codes?

For Medicare in 2027, the change is in how algorithm-based lab analyses are paid. CMS finalized renaming these software-based services Software as a Medical Service (SaMS) and moving 14 algorithm-based analyses performed on laboratory tests from the Clinical Laboratory Fee Schedule to active pricing under the physician fee schedule, at crosswalked OPPS rates¹.

CMS picked the codes whose descriptors describe an algorithmic analysis rather than a wet lab test, and treats them as other diagnostic tests outside the lab date of service policy at 42 CFR 414.510¹. If your lab bills any of them, check which fee schedule and date of service logic your system applies.

What should a billing team update before January 1?

Four things, in this order, because each feeds the next: the charge master and fee schedule, the superbill and EHR picklists, payer policies, and the claims that cross the year.

Start with the charge master. Load the 2027 code file, end-date retired codes at December 31, 2026, price the new codes, and keep the 2026 maternity codes active only for episodes a payer rule covers². Medicare’s final 2027 rates are in Addendum B¹. A code missing from the master becomes a stuck charge at charge entry, which beats a denial.

Then the picklists. Take the global OB codes off the default superbill and the EHR favorites, add the labor and delivery choices, and build a prenatal visit template that documents the E/M level. The CPT code entry explains how the set is organized.

Then payer policy. Every plan needs to answer three questions: does it take the new maternity codes on January 1, what is its rule for episodes that started in 2026, and how does it apply cost-sharing to visit lines.

What to do this week

1. List every active pregnancy due after January 1, 2027, tagged with the first prenatal visit date.
2. Ask each payer, in writing, for its business rule on 2026 maternity codes under the HHS enforcement discretion².
3. Load the October 2026 Category III and PLA codes if your charge master doesn’t have them³.
4. Rebuild the OB superbill and EHR picklist around E/M visits and the new labor and delivery codes¹.
5. Load the 2027 Medicare rates from Addendum B and set fees for each new code¹.