M33 vs M60

M33 (Dermatopolymyositis) compared with M60 (Myositis), 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. M60 carries an Excludes1 note covering M33: “dermatopolymyositis (M33.-)”

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

	M33Dermatopolymyositis	M60Myositis
Billing status	Non-billable header Report instead: M33.00, M33.01, M33.02, M33.03, M33.09	Non-billable header Report instead: M60.000, M60.001, M60.002, M60.003, M60.004
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	Dermatopolymyositis is a non-billable ICD-10-CM category code (M33).	Myositis is a non-billable ICD-10-CM category code (M60).
Includes	autoimmune disease NOS collagen (vascular) disease NOS systemic autoimmune disease systemic collagen (vascular) disease	—

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Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources