M33.99 Dermatopolymyositis, unspecified with other organ involvement

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

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)

Code annotations containing back-references to M33.99

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 M33.99

• Dermatopolymyositis › with › specified organ involvement NEC

Nearby codes

• M33.9 Dermatopolymyositis, unspecified
• M33.90 Dermatopolymyositis, unspecified, organ involvement unspecified
• M33.91 Dermatopolymyositis, unspecified with respiratory involvement
• M33.92 Dermatopolymyositis, unspecified with myopathy
• M33.93 Dermatopolymyositis, unspecified without myopathy
• M33.99 Dermatopolymyositis, unspecified with other organ involvement (this code)