M05.679
BillableRheumatoid arthritis of unspecified ankle and foot 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 the ankle and foot with involvement of other body organs or systems, side not specified.
Coding Tips
- •This code indicates systemic involvement beyond the joint; document which organs are affected (lungs, heart, kidneys, etc.) for complete clinical picture
- •Use this code when rheumatoid arthritis has progressed to affect multiple body systems in addition to the ankle/foot joints
Clinical Significance
This code captures systemic rheumatoid arthritis affecting unspecified ankle and foot with organ involvement, representing advanced inflammatory disease when laterality cannot be determined. The systemic component significantly elevates patient risk beyond simple joint disease.
Documentation Requirements
- ✓Confirmation of rheumatoid arthritis affecting ankle and/or foot
- ✓Documentation that laterality cannot be determined from available records
- ✓Evidence of organ or system involvement beyond ankle/foot joints
- ✓Laboratory support for RA diagnosis (RF, anti-CCP, inflammatory markers)
- ✓Clinical documentation of extra-articular manifestations
- ✓Specific identification of affected organ systems
- ✓Clear relationship between systemic involvement and rheumatoid arthritis
Commonly Confused Codes
M05679 vs M05671/M05672 — Use specific laterality when ankle/foot side is documentedM05679 vs M19.079 — M19.079 is unspecified osteoarthritis of ankle/footM05679 vs M25.579 — M25.579 is pain in unspecified ankle/footM05679 vs M06.9 — M06.9 lacks the required organ involvement specificationM05679 vs M77.9 — M77.9 is unspecified enthesopathy
Code Hierarchy
└M05Rheumatoid arthritis with rheumatoid factor└M05.6Rheumatoid arthritis with involvement of other organs and systems└M05.67Rheumatoid arthritis of ankle and foot with involvement of other organs and systems└M05.679Rheumatoid arthritis of unspecified ankle and foot with involvement of other organs and systems
└M05.679Rheumatoid arthritis of unspecified ankle and foot with involvement of other organs and systems