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M33

Non-billable

Dermatopolymyositis

M33 is the ICD-10-CM code for Dermatopolymyositis. It is a non-billable category code — use a more specific child code such as M33.0 for billing.

Status
Header (non-billable)
Chapter
M00-M99
Subcodes
4
Edition
FY2026

M00-M99 Diseases of the musculoskeletal system and connective tissue

What this means — in plain language

MedlinePlus · NIH

Myositis means inflammation of the muscles that you use to move your body. An injury, infection, or autoimmune disease can cause it. Two specific kinds are polymyositis and dermatomyositis. Polymyositis causes muscle weakness, usually in the muscles closest to the trunk of your body. Dermatomyositis causes muscle weakness, plus a skin rash. Other symptoms of myositis may include: Fatigue after walking or standing…

Read more about Myositis at MedlinePlus ↗

Source: U.S. National Library of Medicine (MedlinePlus). Informational only — not medical advice.

No additional coding notes for this code.

Frequently asked questions

What is ICD-10 code M33?
M33 is the ICD-10-CM code for "Dermatopolymyositis". It falls under M00-M99 Diseases of the musculoskeletal system and connective tissue.
Is M33 a billable code?
No — M33 is a non-billable header code. Use a more specific child code (such as M33.0) for billing.
What are the subcodes of M33?
M33 has 4 more specific child codes, including M33.0, M33.1, M33.2.

Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.

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