M06.1 vs M08.2
M06.1 (Adult-onset Still's disease) compared with M08.2 (Juvenile rheumatoid arthritis with systemic onset), from the official CMS tabular data. Do not report these codes together: the official tabular list marks them Excludes1.
Can these codes be reported together?
No — do not report together. M06.1 carries an Excludes1 note covering M08.2: “Still's disease NOS (M08.2-)”
Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).
No — do not report together. M08.2 carries an Excludes1 note covering M06.1: “adult-onset Still's disease (M06.1-)”
Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).
Side by side
| M06.1Adult-onset Still's disease | M08.2Juvenile rheumatoid arthritis with systemic onset | |
|---|---|---|
| Billing status | Billable | Non-billable header |
| Classification | M00-M99 — Diseases of the Musculoskeletal System and Connective Tissue (M00-M99) | M00-M99 — Diseases of the Musculoskeletal System and Connective Tissue (M00-M99) |
| Definition | Adult-onset Still's disease is a billable ICD-10-CM diagnosis code (M06.1). | Juvenile rheumatoid arthritis with systemic onset is a non-billable ICD-10-CM category code (M08.2). |
| Includes | — | Still's disease NOS |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources