ICD-10 Codes: 2027 ICD-10-CM & ICD-10-PCS Reference
ICD List is a free medical coding reference site with all 74,879 billable diagnosis codes and 79,256 procedure codes for fiscal year 2027, sourced directly from official CMS files. Search ICD-10-CM diagnosis codes and ICD-10-PCS procedure codes with billable status, DRGs, POAs.
Search by code (with or without the dot), description, clinical term, synonym, or abbreviation such as CHF.
Lookup and Index Tools
What’s New in FY 2027
Codes effective October 1, 2026 to September 30, 2027.
ICD-10-CM Codes by Chapter View full tabular list →
ICD-10-PCS Codes by Section View full PCS index →
Coding Rules & Medicare Edits
- Adult diagnoses
- Maternity diagnoses
- Newborn diagnoses
- Pediatric diagnoses
- Questionable admission
- Unacceptable principal dx
- POA exempt codes
Common Codes by Medical Specialty
About ICD List
ICD List is a free reference for the two code sets that run U.S. medical coding and billing: ICD-10-CM for diagnoses and ICD-10-PCS for hospital inpatient procedures. The site carries the complete official release for fiscal year 2027, which covers encounters and discharges from October 1, 2026 through September 30, 2027. Nothing is hand-transcribed. Every code, description, and edit is generated from the federal release files, and the whole site is rebuilt when CMS publishes each annual update and the smaller April addenda.
ICD-10-CM diagnosis codes
ICD-10-CM codes run three to seven characters. The first three identify the disease category, and the characters after the decimal add cause, anatomic site, severity, and encounter detail. Some chapters, notably injuries and external causes, also require a seventh character that describes the encounter, with a placeholder filling any unused positions. A code is billable only when it is coded to its highest level of specificity; category codes and other headers cannot go on a claim. Every code page on the site states whether the code is valid for submission, which MS-DRG groups it belongs to, and the synonyms and index terms that point to it.
ICD-10-PCS procedure codes
ICD-10-PCS codes are exactly seven alphanumeric characters with no decimal, built axis by axis: section, body system, root operation, body part, approach, device, and qualifier. They apply to hospital inpatient stays only; outpatient and physician procedures use CPT and HCPCS instead. The site publishes the full PCS tables for all seventeen sections, from Medical and Surgical through New Technology, in the same browsable and searchable form as the diagnosis side.
Beyond the code sets
Working coders rarely stop at the code itself, so ICD List also carries the reference layers built on top of the code sets: MS-DRG V44.0 grouping for all 768 Medicare DRGs, CMS-HCC risk adjustment categories, the Medicare Code Edits used to validate claims, Present on Admission exempt lists, the official coding guidelines for both code sets, and crosswalks to and from legacy ICD-9.
Data sources
The information on this site comes from official federal releases: ICD-10-CM files and coding guidelines from CMS and the CDC's National Center for Health Statistics; ICD-10-PCS files, MS-DRG grouping definitions, Medicare Code Edits, and POA exempt lists from CMS; and supplemental clinical terminology and chronic condition classifications from the National Library of Medicine and CMS chronic condition data. Each fiscal-year release is loaded as published, without editorial changes to the official text.
Comments and feature suggestions are welcome at [email protected].
