CPT 2027 brings 453 changes — and maternity billing is rebuilt from the ground up
Asked:
“what are the major changes coming to the CPT code set in 2027”
The final CPT 2027 code set takes effect January 1, 2027 with 453 editorial changes — 299 new codes, 74 revisions, 80 deletions — per the AMA release. Nine major change areas below are drawn from 7 independent hosts, with corroboration spanning 2–50 hosts per area. CPT publication is separate from payer coverage and payment decisions: each payer sets its own rules.
Where the disruption lands: nine major change areas, ranked by corroboration
Bar length = independent web hosts describing each change; the more hosts, the more widely flagged the operational impact. Hover or tap a bar for the change and its impact.
Maternity — biggest workflow change (global OB bundle eliminated)Other major areas
Shape of the code set update
The 453 editorial changes in the AMA's headline totals, split by type.
Maternity is the biggest workflow change: the global OB bundle is replaced by four separately billed phases — 17 deletions, 12 additions, 6 revisions — with modifier TH and Z3A.xx diagnoses on antepartum claims from September 1, 2026.
rcmmasters.comAI grows in two ways: 10 new AI-related codes bring the total to 43, and Appendix S reframes assistive vs augmentative vs autonomous software — augmentative work is typically captured by existing codes, not a guaranteed separate payment path.
discoveriesinhealthpolicy.comAdaptive behavior services get six new permanent codes; temporary T-codes 0362T and 0373T are deleted and all eight standard codes 97151–97158 are revised, so treatment plans and authorizations need remapping.
linkedin.comProcedure coding modernizes across specialties: prostate biopsy codes are reorganized around "including image guidance" (55712, 55713, 55706 deleted), nine diaphragmatic-hernia repair codes are added, and ventricular assist device procedures are updated.
aapc.com
All nine areas in detail
| Area | What changes | Codes named | Hosts | Source |
|---|
Method: built from the AMA's CPT 2027 release (effective 2027-01-01; 453 editorial changes = 299 new + 74 revised + 80 deleted) plus one summary row per major change area — 9 areas across 7 hosts in the final selection, corroborated by 2–50 hosts and 4–74 pages each; no URL backs more than one area. Research current as of September 14, 2026. "Hosts" counts independent websites describing the change. Code numbers are blank where public sources did not state them; long operational-impact text was shortened for space. CPT code publication does not determine payer coverage or payment.