M33.12 Other dermatomyositis with myopathy

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

Applies from M33.1 Other dermatomyositis

Applicable to

• Adult dermatomyositis

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)

• 359.6 Symptomatic inflammatory myopathy in diseases classified elsewhere (approximate)
• 710.3 Dermatomyositis (approximate)

Code annotations containing back-references to M33.12

Back-references to M33

• Type 1 Excludes: G72 Other and unspecified myopathies ("dermatopolymyositis (M33.-)")
• 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 M33.12

• Dermatomucosomyositis › with › myopathy
• Dermatomyositis (acute) (chronic) › specified NEC › with › myopathy
• Dermatopolymyositis › specified NEC › myopathy
• Poikilodermatomyositis › with › myopathy

Nearby codes

• M33.03 Juvenile dermatomyositis without myopathy
• M33.09 Juvenile dermatomyositis with other organ involvement
• M33.1 Other dermatomyositis
• M33.10 Other dermatomyositis, organ involvement unspecified
• M33.11 Other dermatomyositis with respiratory involvement
• M33.12 Other dermatomyositis with myopathy (this code)
• M33.13 Other dermatomyositis without myopathy
• M33.19 Other dermatomyositis with other organ involvement
• M33.2 Polymyositis
• M33.20 Polymyositis, organ involvement unspecified
• M33.21 Polymyositis with respiratory involvement