About ICD10Ref

A fast, clean reference for ICD-10-CM diagnosis codes, built for medical coders.

What you will find

• A page for every code, category, block and chapter in the FY2027 code set.
• The notes that go with each code in one place and in plain view: Code first, Use additional code, Code also, Excludes1, Excludes2, Includes and inclusion terms, each marked with a color and an icon. Notes from the levels above a code are inherited and labeled with where they came from.
• Billable or not, at a glance, plus help with 7th characters.
• The Alphabetic Index, A to Z, with each entry linked to its code, and each code page showing the Index terms that lead to it.
• Search across every code and the Alphabetic Index, including common abbreviations (COPD, CKD, MI, DM) and plain-language terms. It runs in your browser, and what you type stays on your device.
• Small conveniences: copy buttons, a no-dot copy for claim forms, Recents and Favorites, private notes on each code (how My notes works), and a tip of the day.

Where the information comes from

Code data comes from the FY2027 ICD-10-CM files published by CMS and NCHS (effective October 1, 2026). ICD-10-CM is in the public domain. Summaries, captions and tips on this site were written by ICD10Ref. ICD10Ref is not affiliated with or endorsed by CMS, NCHS or any government agency.

ICD10Ref is intended for use in the United States.

A reference aid, not the final word

ICD10Ref does not replace the official code set or the Official Guidelines for Coding and Reporting, which are the authority. See the Guidelines page for where to find them, and the Terms and Disclaimer.

What changed this year

New, revised and deleted codes for FY2027 are listed on What’s new.

Questions and corrections

Found a mistake or have an idea? Use the Contact page. You can also read how the site handles privacy.