M05.659
BillableRheumatoid arthritis of unspecified hip with involvement of other organs and systems
HCC Category Mapping
V28HCC 93 — Rheumatoid Arthritis and Inflammatory Connective Tissue Disease
0.175V24HCC 40 — Rheumatoid Arthritis and Inflammatory Connective Tissue Disease
0.307ESRDHCC 40 — Rheumatoid Arthritis and Inflammatory Connective Tissue Disease
0.000RxHCCHCC 83 — Rheumatoid Arthritis and Inflammatory Connective Tissue Disease
0.000What This Code Means
Rheumatoid arthritis affecting an unspecified hip with systemic complications involving other organs or body systems.
Coding Tips
- •Use only when hip laterality is not documented; query provider to determine if left, right, or bilateral before assigning this code.
- •Ensure systemic involvement is documented to justify the M05.6x series rather than localized arthritis codes.
Clinical Significance
This code captures systemic rheumatoid arthritis affecting an unspecified hip with organ system involvement, representing advanced inflammatory disease with significant morbidity potential. The unspecified laterality should only be used when documentation lacks specific side identification.
Documentation Requirements
- ✓Confirmation of rheumatoid arthritis diagnosis affecting hip joint(s)
- ✓Documentation that specific side (left/right) cannot be determined
- ✓Evidence of organ or system involvement beyond joints
- ✓Laboratory support for RA diagnosis (RF, anti-CCP, ESR, CRP)
- ✓Clinical documentation of extra-articular manifestations
- ✓Specific identification of affected organ systems
- ✓Clear relationship between systemic involvement and rheumatoid arthritis
Commonly Confused Codes
M05659 vs M05651/M05652 — Use specific laterality codes when hip side is documentedM05659 vs M06.9 — M06.9 lacks the required organ/system involvement componentM05659 vs M25.559 — M25.559 is hip pain without inflammatory arthritisM05659 vs M79.3 — M79.3 is panniculitis, not systemic rheumatoid arthritisM05659 vs M05.40 — M05.40 is rheumatoid myopathy without hip specification
Code Hierarchy
└M05Rheumatoid arthritis with rheumatoid factor└M05.6Rheumatoid arthritis with involvement of other organs and systems└M05.65Rheumatoid arthritis of hip with involvement of other organs and systems└M05.659Rheumatoid arthritis of unspecified hip with involvement of other organs and systems
└M05.659Rheumatoid arthritis of unspecified hip with involvement of other organs and systems