CPT, ICD-10-CM, HCPCS, and the Medicare Physician Fee Schedule don’t move on the same calendar. Each one resets on its own clock, and most independent practices find out about a change when a claim denies, not before. This fall brings two of those clocks landing on the same date, plus a public comment window that’s closing fast.
Oct 1
ICD-10-CM FY2027 and HCPCS Q4 both take effect
Sept 14
Public comment period closes on the proposed CY2027 fee cut
$541.5M
Federal settlement this year tied to coding and documentation integrity
Two code sets reset October 1
ICD-10-CM’s annual update always lands October 1, aligned to the federal fiscal year. HCPCS Level II’s Q4 quarterly update lands the same day. That means diagnosis codes and a slate of HCPCS codes change simultaneously, with about four weeks of runway left to get ready. A practice running on last year’s code set risks denials the moment claims start going out under the new set.
The fee schedule comment window is closing
CMS’s proposed CY2027 Medicare Physician Fee Schedule cuts the conversion factor to $32.84 for non-qualifying participants and $33.17 for Qualifying APM Participants, as the temporary 2026 payment bump expires. It also carries forward the efficiency adjustment already reducing work RVUs on roughly 7,700 procedural codes, a policy that started in 2026, not one CY2027 is introducing. Public comments close September 14. After that, the rule moves toward finalization around November 1.
Enforcement is watching coding accuracy, not just fee schedules
Earlier this year, a Medicare Advantage provider group agreed to pay $541.5 million to resolve federal allegations of inflated diagnosis coding, one of the largest recent examples of regulators pursuing coding and documentation integrity. That case involved a large health system’s risk-adjustment coding, not standard fee-for-service billing at a small practice, but it signals where scrutiny is heading industry-wide. A higher-paying code without documentation to match it is exposure, not revenue.
Where to start
Pull your top 20-30 codes by volume and revenue, cross-reference them against the new code sets and proposed rates, and flag anything that’s being deleted, bundled, or newly requiring a modifier or prior auth. Do this before October 1, not after the first denial shows up.
And if you’d rather just talk it through, we offer a free 30-minute Practice Analysis where we look at your actual numbers together — no obligation, no cost.