M08.9A vs M33.0
M08.9A (Juvenile arthritis, unspecified, other specified site) compared with M33.0 (Juvenile dermatomyositis), 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. M08.9A carries an Excludes1 note covering M33.0: “juvenile dermatomyositis (M33.0-)”
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
| M08.9AJuvenile arthritis, unspecified, other specified site | M33.0Juvenile dermatomyositis | |
|---|---|---|
| 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 | Juvenile arthritis, unspecified, other specified site is a billable ICD-10-CM diagnosis code (M08.9A). | Juvenile dermatomyositis is a non-billable ICD-10-CM category code (M33.0). |
| Includes | — | autoimmune disease NOS collagen (vascular) disease NOS systemic autoimmune disease systemic collagen (vascular) disease |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources