Excludes1 pair
M06.1 vs M08-
M06.1 and M08 are not coded together. ICD-10-CM declares them mutually exclusive with an Excludes1 note — the two conditions are not expected to occur together, so exactly one of them is normally correct for a given encounter. The Official Guidelines carve out one exception: if the two conditions are clearly unrelated to each other, both may be reported.
The official note, declared on M06.1
Still's disease NOS (M08.2-)
M06.1
Adult-onset Still's disease
Billable
- Chapter 13
- Diseases of the musculoskeletal system and connective tissue
- Section
- M05-M14
Indexed under
- Still's disease or syndrome › adult-onset
M08
Juvenile arthritis
Not billable
- Chapter 13
- Diseases of the musculoskeletal system and connective tissue
- Section
- M05-M14
Excludes1 is not always absolute: where two conditions covered by the note are genuinely unrelated, CMS guidance permits reporting both. Document the reasoning rather than assuming it. More on Excludes1 vs Excludes2 · FY2027