Excludes1 vs Excludes2: What Is the Difference in ICD-10-CM?

Excludes1 generally means the excluded condition is not reported with the code above the note; Excludes2 means the conditions can coexist when both are documented and reportable. The FY2027 guidelines, section I.A.12, include an Excludes1 exception when the two conditions are unrelated. If the relationship is unclear, query the provider rather than deciding from the code titles alone.

This makes a simple “never together” shortcut incomplete. The documented conditions and the actual exclusion must be reviewed together. Do not assume that the presence of two different descriptions proves the conditions are unrelated.

An Excludes2 note identifies a condition that is outside the meaning of the code being viewed. A patient may have both conditions, and both codes can be reported when appropriate. The note is not an instruction to add the second code automatically.

First establish that both conditions are documented and meet the reporting rules for the setting. Then check any other instructions that affect assignment or sequence.

Exclusion notes may be attached to a parent category rather than repeated under every child. On Code Hub, review both the code’s own notes and its inherited instructions. Use the hierarchy links to inspect the original location of a note when you need context.

The M54.5 category and its more detailed entries provide a useful place to practice navigating parent and child information. This is a reading exercise, not a recommendation to assign a code to a particular patient.

1. Is the note Excludes1 or Excludes2?
2. Does it apply to this entry through a parent category?
3. What does the documentation establish about the two conditions and their relationship?
4. Do other reporting or sequencing instructions apply?

Return to the index-to-tabular workflow whenever the relationship or scope of a note is uncertain. Keep the official guidance open for the complete rules and examples; a short definition cannot replace that context.