M05.669
BillableRheumatoid arthritis of unspecified knee 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 knee with systemic complications involving other organs or body systems.
Coding Tips
- •Avoid this code if laterality can be determined; query documentation to clarify left vs. right knee involvement.
- •Ensure systemic manifestations are documented to justify use of M05.6x category codes.
Clinical Significance
This diagnosis captures systemic rheumatoid arthritis affecting an unspecified knee with organ involvement, representing advanced inflammatory disease. The unspecified laterality should only be used when documentation fails to identify whether left or right knee is affected.
Documentation Requirements
- ✓Confirmation of rheumatoid arthritis diagnosis affecting knee joint
- ✓Documentation that laterality (left/right) cannot be determined from record
- ✓Evidence of organ or system involvement beyond the knee
- ✓Laboratory confirmation supporting RA diagnosis
- ✓Clinical documentation of extra-articular manifestations
- ✓Specific identification of affected organ systems
- ✓Clear attribution of systemic involvement to rheumatoid arthritis process
Commonly Confused Codes
M05669 vs M05661/M05662 — Use specific laterality when knee side is documentedM05669 vs M17.9 — M17.9 is unspecified osteoarthritis of kneeM05669 vs M25.569 — M25.569 is unspecified knee painM05669 vs M06.9 — M06.9 is unspecified RA without organ involvement requirementM05669 vs M13.169 — M13.169 is monoarthritis of unspecified knee
Code Hierarchy
└M05Rheumatoid arthritis with rheumatoid factor└M05.6Rheumatoid arthritis with involvement of other organs and systems└M05.66Rheumatoid arthritis of knee with involvement of other organs and systems└M05.669Rheumatoid arthritis of unspecified knee with involvement of other organs and systems
└M05.669Rheumatoid arthritis of unspecified knee with involvement of other organs and systems