M06.4 Inflammatory polyarthropathy

Billable ICD-10-CM code, FY2026.

Excludes1 (never code together)

• polyarthritis NOS (M13.0)

Risk adjustment (HCC)

• CMS-HCC V28: HCC 94 — Systemic Lupus Erythematosus and Other Specified Systemic Connective Tissue Disorders
• CMS-HCC V22: HCC 40 — Rheumatoid Arthritis and Inflammatory Connective Tissue Disease
• RxHCC V08: HCC 83 — Rheumatoid Arthritis and Other Inflammatory Polyarthropathy
• ESRD V24: HCC 40

MS-DRG index

Defines the logic of DRG(s) 553-554 in MDC 08.

Approximate ICD-9-CM (GEMs)

• 714.89 Other specified inflammatory polyarthropathies (approximate)
• 714.9 Unspecified inflammatory polyarthropathy (approximate)

Diagnosis Index entries for M06.4

• Polyarthritis, polyarthropathy › inflammatory

Nearby codes

• M06.371 Rheumatoid nodule, right ankle and foot
• M06.372 Rheumatoid nodule, left ankle and foot
• M06.379 Rheumatoid nodule, unspecified ankle and foot
• M06.38 Rheumatoid nodule, vertebrae
• M06.39 Rheumatoid nodule, multiple sites
• M06.4 Inflammatory polyarthropathy (this code)
• M06.8 Other specified rheumatoid arthritis
• M06.80 Other specified rheumatoid arthritis, unspecified site
• M06.81 Other specified rheumatoid arthritis, shoulder
• M06.811 Other specified rheumatoid arthritis, right shoulder
• M06.812 Other specified rheumatoid arthritis, left shoulder