M36.0

Billable

Dermato(poly)myositis in neoplastic disease

HCC Category Mapping

V28HCC 93 — Rheumatoid Arthritis and Inflammatory Connective Tissue Disease

0.175

V24HCC 40 — Rheumatoid Arthritis and Inflammatory Connective Tissue Disease

0.307

ESRDHCC 40 — Rheumatoid Arthritis and Inflammatory Connective Tissue Disease

0.000

RxHCCHCC 83 — Rheumatoid Arthritis and Inflammatory Connective Tissue Disease

0.000

What This Code Means

Muscle inflammation and weakness (dermatomyositis or polymyositis) that occurs as a result of cancer in the body.

Coding Tips

•Always code the underlying neoplasm first, then this code as a secondary diagnosis
•Document the type of cancer and which muscles are affected

Clinical Significance

Dermato(poly)myositis in neoplastic disease represents a serious paraneoplastic syndrome requiring oncologic evaluation and treatment of both the underlying malignancy and the inflammatory myopathy. This condition has high mortality risk and requires coordinated care between oncology and rheumatology.

Documentation Requirements

✓Documentation of confirmed malignancy with specific type and staging
✓Evidence of dermatomyositis or polymyositis with characteristic features
✓Muscle enzyme elevation and/or electromyographic abnormalities
✓Muscle or skin biopsy findings consistent with inflammatory myopathy
✓Timeline establishing relationship between cancer and myositis
✓Assessment of muscle weakness and functional impairment
✓Treatment plan addressing both cancer and inflammatory myopathy

Code First

underlying neoplasm (C00-D49)

Commonly Confused Codes

M33.90 — Dermatopolymyositis, unspecified (lacks neoplastic association)M33.10 — Other dermatomyositis (not paraneoplastic)M33.20 — Polymyositis (lacks neoplastic association)C80.1 — Malignant neoplasm, unspecified (lacks myositis component)G73.7 — Myopathy in diseases classified elsewhere (broader category)

Code Hierarchy

└M36Systemic disorders of connective tissue in diseases classified elsewhere └M36.0Dermato(poly)myositis in neoplastic disease

└M36.0Dermato(poly)myositis in neoplastic disease