ICD-10-CM Excludes1 Notes ICD-10-CM
An Excludes1 note means "NOT CODED HERE": the excluded code should never be reported together with the code above the note. The FY 2027 Tabular List has 5,411 Excludes1 Notes; 5,284 of them name other codes, with 5,710 references to 3,528 distinct codes, categories and ranges. Pick a chapter below to see every note in it, by the code that carries the note or by the code it names.
A type 1 Excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. It is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition. An exception applies when the two conditions are unrelated to each other; then both codes may be reported together. If it is not clear whether the two conditions are related, query the provider.
Excludes1 Notes by Chapter 22 chapters
“References to its codes” counts notes anywhere in the Tabular List that name a code in the chapter; “references in its notes” counts the codes named by notes printed in the chapter. Each chapter page shows both lists.
Questions About Excludes1 Notes
What does an Excludes1 note mean?
An Excludes1 note means “NOT CODED HERE!”: the excluded code should never be used at the same time as the code above the note. It is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition (Section I.A.12.a). The FY 2027 Tabular List has 5,411 of them; 5,284 name other codes, with 5,710 references to 3,528 distinct codes, categories and ranges.
Is there any exception to an Excludes1 note?
Yes: when the two conditions are unrelated to each other. The Guidelines’ example is F45.8, whose Excludes1 note names sleep related teeth grinding (G47.63). A patient with psychogenic dysmenorrhea (an inclusion term of F45.8) and teeth grinding may have both codes reported. If it is not clear whether the conditions are related, query the provider.
What is the difference between Excludes1 and Excludes2?
Excludes1 means "not coded here": the two codes are never reported together, because the conditions cannot occur together. Excludes2 means "not included here": the excluded condition is not part of this code, but the patient may have both, so both codes may be reported (Section I.A.12).
Official Sources & Methodology
Every note on these pages is loaded verbatim from the FY 2027 ICD-10-CM Tabular List. Code references inside the notes are matched against the FY 2027 code set, so every link opens a valid code; scope counts (“applies to N codes”) count the billable codes under the note’s chapter, block or category.
- CMS ICD-10-CM FilesThe Tabular List (XML) that every note, note type and code reference on ICD List comes from.
- ICD-10-CM Official Guidelines for Coding and Reporting FY 2027Section I.A, Conventions for the ICD-10-CM, defines each note type; the definitions on these pages follow its wording.
ICD List is not affiliated with CMS or NCHS. These pages are a coding reference; the Tabular List and the Official Guidelines remain the authority.
Related References
Source: FY 2027 ICD-10-CM Tabular List (CMS and NCHS) and the ICD-10-CM Official Guidelines for Coding and Reporting FY 2027, Section I.A. ICD List is not affiliated with CMS or NCHS.
