M36.0 Dermato(poly)myositis in neoplastic disease

Billable ICD-10-CM code, FY2026. Acts as a Complication or Comorbidity (CC) as a secondary diagnosis.

Code first

• underlying neoplasm (C00-D49)

Applies from M36 Systemic disorders of connective tissue in diseases classified elsewhere

Excludes2 (not included here)

• arthropathies in diseases classified elsewhere (M14.-)

Risk adjustment (HCC)

• CMS-HCC V28: HCC 93 — Rheumatoid Arthritis and Other Specified Inflammatory Rheumatic Disorders
• CMS-HCC V22: HCC 40 — Rheumatoid Arthritis and Inflammatory Connective Tissue Disease
• RxHCC V08: HCC 83 — Rheumatoid Arthritis and Other Inflammatory Polyarthropathy
• ESRD V24: HCC 40

MS-DRG index

Defines the logic of DRG(s) 545-547 in MDC 08.

Approximate ICD-9-CM (GEMs)

• 710.3 Dermatomyositis (approximate)

Medicare Code Edits (MCE v43.1 (April 2026))

• Manifestation codes as principal diagnosis: Manifestation codes describe the manifestation of an underlying disease, not the disease itself, and are not allowed as principal diagnosis.

Code annotations containing back-references to M36.0

Back-references to M36

• Type 2 Excludes: I77 Other disorders of arteries and arterioles ("collagen (vascular) diseases (M30-M36)")
• Type 2 Excludes: J82 Pulmonary eosinophilia, not elsewhere classified ("pulmonary eosinophilia due to systemic connective tissue disorders (M30-M36)")
• Code First: J84.170 Interstitial lung disease with progressive fibrotic phenotype in diseases classified elsewhere ("systemic connective tissue disorders (M30-M36)")
• Type 1 Excludes: L94 Other localized connective tissue disorders ("systemic connective tissue disorders (M30-M36)")

Diagnosis Index entries for M36.0

• Dermatomyositis (acute) (chronic) › in (due to) neoplastic disease
• Dermatopolymyositis › in neoplastic disease

Nearby codes

• M36 Systemic disorders of connective tissue in diseases classified elsewhere
• M36.0 Dermato(poly)myositis in neoplastic disease (this code)
• M36.1 Arthropathy in neoplastic disease
• M36.2 Hemophilic arthropathy
• M36.3 Arthropathy in other blood disorders
• M36.4 Arthropathy in hypersensitivity reactions classified elsewhere
• M36.8 Systemic disorders of connective tissue in other diseases classified elsewhere