M06.4
BillableInflammatory polyarthropathy
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
Inflammation affecting multiple joints that is related to rheumatoid arthritis or similar inflammatory conditions, but does not meet criteria for classic rheumatoid arthritis.
Coding Tips
- •This code is used for inflammatory polyarthropathy when the specific type or etiology may not be fully determined or when it's a variant of RA
- •Ensure that serology results (RF, anti-CCP) and clinical presentation are documented to support the diagnosis of inflammatory polyarthropathy
Clinical Significance
Inflammatory polyarthropathy represents a serious chronic condition involving multiple joints with ongoing inflammation that may lead to joint destruction and functional disability. This diagnosis indicates need for aggressive anti-inflammatory treatment and regular monitoring for disease progression.
Documentation Requirements
- ✓Documentation of inflammation affecting multiple joints simultaneously
- ✓Clinical evidence of polyarticular involvement (≥5 joints typically)
- ✓Inflammatory markers supporting active disease (ESR, CRP elevation)
- ✓Assessment of joint function and range of motion limitations
- ✓Exclusion of other specific inflammatory arthropathies when possible
- ✓Response to anti-inflammatory treatments documented
- ✓Functional assessment and impact on activities of daily living
- ✓Monitoring plan for disease progression and complications
Excludes 1 — Do NOT code together
- polyarthritis NOS (M13.0)
Commonly Confused Codes
M05.9 — Rheumatoid arthritis with rheumatoid factor, unspecified (when RF positive)M06.9 — Rheumatoid arthritis, unspecified (when meets RA criteria)M79.3 — Panniculitis, unspecified (localized inflammation without joint involvement)M25.50 — Pain in unspecified joint (symptom without inflammatory evidence)M19.90 — Unspecified osteoarthritis, unspecified site (degenerative versus inflammatory)