Why Your October Procedure Codes Expire in March
CMS dates the FY2027 procedure code set October 1 through March 31, not through September. The April 1 mid-year update has grown from 7 codes to 80, it ships its own grouper, and one new cardiac family carries a $10,261 DRG gap.
CMS dates the FY2027 diagnosis codes for a full year on its own file page. October 1, 2026 through September 30, 2027.
The procedure codes posted a few inches below get half of that. CMS tells you to use them for discharges occurring from October 1, 2026 through March 31, 2027.
Six months.
That boundary has been on the ICD-10 page for years and almost everyone reads past it, because the mid-year update used to be a formality.
April 2022 was 7 codes, all COVID therapeutics. This past April it was 80, and the October 1 update now landing is 101 (chart below).
The mid-year load is now 79% of the annual one. It arrives with no IPPS rule behind it, no comment period, and no trade-press cycle.
CMS ships a second grouper, and has for seven years
The 80 April codes did not arrive on their own. CMS released ICD-10 MS-DRG Grouper Version 43.1 and Medicare Code Editor Version 43.1 alongside them, both effective for discharges on or after April 1, 2026.
That is the seventh straight year with a mid-year grouper. Version 37.1 landed April 1, 2020, then 38.1 on January 1, 2021, then 39.1 through 43.1 every April since.
Your encoder vendor has this on a calendar. Your IT change-freeze schedule usually does not.
The rest of this brief is for subscribers.
The impact tables, the code-level detail, and the rest of the analysis sit past this line.
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