M33.22

Billable

Polymyositis with myopathy

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

A rare autoimmune disease causing inflammation and weakness of the muscles without skin involvement.

Coding Tips

•Verify muscle involvement through clinical findings, elevated CK levels, or muscle biopsy results
•Distinguish from dermatomyositis by confirming absence of characteristic skin manifestations

Clinical Significance

Polymyositis with myopathy indicates the classic presentation of this inflammatory muscle disease with significant functional impairment and disability risk. This condition requires aggressive immunosuppressive treatment and comprehensive rehabilitation to prevent permanent muscle damage.

Documentation Requirements

✓Confirmed polymyositis diagnosis
✓Evidence of muscle weakness and inflammation
✓Elevated muscle enzymes (CK, aldolase, LDH)
✓EMG findings consistent with inflammatory myopathy
✓Muscle biopsy results when available
✓Functional strength assessment
✓Absence of characteristic dermatomyositis skin changes
✓Treatment response monitoring

Commonly Confused Codes

M33.12 — Use for dermatomyositis with myopathy M33.20 — Use when myopathy is not specifically documented M60.9 — Use for other myositis without autoimmune features G71.0 — Use for genetic muscle diseases, not inflammatory

Code Hierarchy

└M33Dermatopolymyositis └M33.2Polymyositis └M33.22Polymyositis with myopathy

└M33.22Polymyositis with myopathy