Methodology and sources

Sources

• ICD-10-CM FY2027: code descriptions and order files published by the National Center for Health Statistics (NCHS/CDC), the same files CMS posts for the FY2027 code year. Effective for encounters October 1, 2026 to September 30, 2027.
• ICD-10-PCS FY2027: codes file published by the Centers for Medicare & Medicaid Services (CMS). Effective for discharges October 1, 2026 to September 30, 2027.
• HCPCS Level II: CMS October 2026 quarterly alpha-numeric HCPCS file (contractor ANWEB workbook), updated September 23, 2026.
• Medicare Physician Fee Schedule CY2026: CMS RVU file, October release (RVU26D), including work, practice expense and malpractice RVUs and the CY2026 conversion factor, plus the CY2026 GPCI file for locality adjustment. Locality rates are computed with the CMS formula - (work RVU x work GPCI) + (practice expense RVU x PE GPCI) + (malpractice RVU x MP GPCI), all times the conversion factor - in the visitor's browser; there are no per-locality pages.
• NCCI edits: CMS Medicare NCCI Procedure-to-Procedure edits, Practitioner Services, version 32.3 effective October 1, 2026 (2026 Q4), and the Practitioner Services Medically Unlikely Edits table for the same quarter. Only active edits are used (deletion date blank or open). Pair verdicts are computed in the browser from sharded data files; there are no per-pair pages.

How the sets are presented

• ICD-10-CM category pages list billable codes only - codes flagged valid for submission in the order file. Header (non-billable) codes appear as category and subcategory names, never as billable results.
• ICD-10-PCS pages group codes by their first three characters (section, body system, root operation). All 7-character codes in the CMS file are complete, valid codes.
• HCPCS pages list active codes only: records with a termination date in the CMS file are excluded (1322 terminated records in the October 2026 file). Modifiers are the CMS file's modifier records, active only.
• Coverage letters, BETOS categories and other CMS administrative fields are as published; the search tool shows the plain description first because that is what a lookup is for.
• Yearly change counts on the FY2027 update guide are counted directly from the official addenda files (ICD-10-CM: 190 added, 30 deleted, 8 revised; ICD-10-PCS: 101 added, 38 deleted, 6 revised).

Limits

This site reproduces the public code descriptions; it does not reproduce the ICD-10-CM Official Guidelines for Coding and Reporting, NCCI edits, payer policies or fee schedules, and it is not a substitute for them. Code assignment depends on documentation and current guidance. CPT codes and descriptions are the intellectual property of the American Medical Association and are not published here.