M02.361
BillableReiter's disease, right knee
HCC Category Mapping
V28HCC 94 — Reactive and Specified Arthropathies
0.000V24HCC 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
Reiter's disease affecting the right knee joint, a reactive arthritis that develops following an infection in another part of the body.
Coding Tips
- •Confirm laterality is documented as right; if unspecified, use M02.369 instead
- •Document the triggering infection (commonly chlamydia or dysentery) to support medical necessity and treatment decisions
Clinical Significance
Reiter's disease affecting the right knee represents a major weight-bearing joint inflammatory arthropathy that significantly impacts mobility and functional independence. This reactive arthritis condition typically requires aggressive immunosuppressive treatment and carries important implications for long-term disability and healthcare costs.
Documentation Requirements
- ✓Specific documentation of right knee joint involvement
- ✓Confirmed diagnosis of Reiter's disease with supporting clinical criteria
- ✓History of preceding bacterial infection (Chlamydia, enteric pathogens)
- ✓Physical examination findings of knee effusion, warmth, and range of motion loss
- ✓Synovial fluid analysis if arthrocentesis performed
- ✓Assessment of weight-bearing capacity and ambulatory function
- ✓Laboratory markers of systemic inflammation
- ✓Treatment regimen including DMARDs or biologic therapy
Commonly Confused Codes
M06.061 — Rheumatoid arthritis of right knee has symmetric pattern and positive serologyM02.861 — Other reactive arthropathies of right knee lacks specific Reiter's diagnosisM17.11 — Unilateral primary osteoarthritis of right knee is degenerative conditionM23.91 — Internal derangement of unspecified knee involves mechanical problems, not inflammation