M06.079
BillableRheumatoid arthritis without rheumatoid factor, unspecified ankle and foot
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 without the typical blood marker affecting the ankle and foot when the specific side is not documented or both sides are involved.
Coding Tips
- •Use this code only when laterality cannot be determined; bilateral involvement may require separate codes for each side
- •Clarify with the provider if both ankles/feet are affected or if documentation is simply unclear
Clinical Significance
Seronegative rheumatoid arthritis affecting unspecified ankle and foot indicates chronic inflammatory disease requiring specialized rheumatologic care. This diagnosis supports risk adjustment for patients with ongoing autoimmune conditions and associated healthcare complexity.
Documentation Requirements
- ✓Documented diagnosis of rheumatoid arthritis by treating physician
- ✓Confirmed negative rheumatoid factor laboratory results
- ✓Clinical evidence of ankle and/or foot joint involvement
- ✓Signs of inflammatory arthritis without specified laterality
- ✓Treatment history with DMARDs or biologic therapies
- ✓Assessment of disease activity and functional limitations
- ✓Exclusion of other inflammatory or infectious arthropathies
- ✓Documentation of chronic, ongoing nature of condition
Commonly Confused Codes
M05.879 — Rheumatoid arthritis WITH rheumatoid factor, unspecified ankle/footM19.079 — Primary osteoarthritis of unspecified ankle and footM25.579 — Pain in unspecified ankle and footM06.071/M06.072 — When specific laterality IS available in documentationM12.879 — Other specific arthropathies, unspecified ankle/foot
Code Hierarchy
└M06Other rheumatoid arthritis└M06.0Rheumatoid arthritis without rheumatoid factor└M06.07Rheumatoid arthritis without rheumatoid factor, ankle and foot└M06.079Rheumatoid arthritis without rheumatoid factor, unspecified ankle and foot
└M06.079Rheumatoid arthritis without rheumatoid factor, unspecified ankle and foot