M05.642

Billable

Rheumatoid arthritis of left hand with involvement of other organs and systems

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

Rheumatoid arthritis affecting the left hand with systemic complications involving other organs or body systems.

Coding Tips

•This code indicates seropositive rheumatoid arthritis with extra-articular manifestations; document which organs/systems are involved (e.g., lungs, heart, kidneys) for complete clinical picture.
•Verify laterality is documented as left hand; if bilateral or unspecified, use different code.

Clinical Significance

Indicates rheumatoid arthritis of the left hand with involvement of other organs and systems, representing severe systemic inflammatory disease with extra-articular complications. This diagnosis captures complex RA requiring intensive management due to both hand joint destruction and systemic organ involvement affecting patient function and quality of life.

Documentation Requirements

✓Confirmed rheumatoid arthritis diagnosis with appropriate diagnostic evidence
✓Specific left hand joint involvement documented
✓Evidence of extra-articular organ system involvement
✓Documentation of systemic manifestations beyond joint disease
✓Laboratory evidence of active inflammation and disease markers
✓Multi-specialty evaluations confirming organ involvement
✓Functional assessment of hand mobility and activities of daily living
✓Physician documentation linking RA to systemic complications

Commonly Confused Codes

M05.641 — Use for right hand involvement specifically M05.649 — Use when hand laterality is not documented M19.042 — Primary osteoarthritis of left hand without RA M06.842 — Other specified RA of left hand without organ involvement M25.542 — Pain in left hand without confirmed arthritis

Code Hierarchy

└M05Rheumatoid arthritis with rheumatoid factor └M05.6Rheumatoid arthritis with involvement of other organs and systems └M05.64Rheumatoid arthritis of hand with involvement of other organs and systems └M05.642Rheumatoid arthritis of left hand with involvement of other organs and systems

└M05.642Rheumatoid arthritis of left hand with involvement of other organs and systems