M06.861

Billable

Other specified rheumatoid arthritis, right knee

HCC Category Mapping

V28HCC 93 — Rheumatoid Arthritis and Inflammatory Connective Tissue Disease

0.175

V24HCC 40 — Rheumatoid Arthritis and Inflammatory Connective Tissue Disease

0.307

ESRDHCC 40 — Rheumatoid Arthritis and Inflammatory Connective Tissue Disease

0.000

RxHCCHCC 83 — Rheumatoid Arthritis and Inflammatory Connective Tissue Disease

0.000

What This Code Means

A form of rheumatoid arthritis affecting the right knee joint, characterized by inflammation and joint damage that doesn't fit into other specific rheumatoid arthritis categories.

Coding Tips

•Verify right knee is specifically documented; knee involvement is common in RA and requires accurate laterality coding
•Distinguish between M06.8x (other specified RA) and M05.x (seropositive RA) based on serological status documentation

Clinical Significance

Other specified rheumatoid arthritis of the right knee indicates an atypical RA variant affecting a major weight-bearing joint crucial for mobility and functional activities. Knee involvement significantly impacts ambulation, stair climbing, and activities requiring lower extremity stability.

Documentation Requirements

✓Established rheumatoid arthritis diagnosis with documented atypical features
✓Physical examination confirming right knee joint involvement
✓Specific characteristics that classify this as 'other specified' RA variant
✓Assessment of right knee range of motion, stability, and weight-bearing capacity
✓Laboratory evidence supporting active rheumatoid disease process
✓Functional evaluation of ambulation, stair climbing, and mobility limitations
✓Documentation of joint effusion, synovitis, or other inflammatory signs
✓Treatment approach including knee-specific interventions when needed

Commonly Confused Codes

M06.862 — Other specified rheumatoid arthritis, left knee (incorrect laterality)M06.869 — Other specified rheumatoid arthritis, unspecified knee (when laterality documented)M05.861 — Other rheumatoid arthritis with rheumatoid factor of right knee (different RA classification)M25.561 — Pain in right knee (symptom code without inflammatory diagnosis)M17.11 — Unilateral primary osteoarthritis, right knee (degenerative versus inflammatory)

Code Hierarchy

└M06Other rheumatoid arthritis └M06.8Other specified rheumatoid arthritis └M06.86Other specified rheumatoid arthritis, knee └M06.861Other specified rheumatoid arthritis, right knee

└M06.861Other specified rheumatoid arthritis, right knee