M12.261 Villonodular synovitis (pigmented), right knee

Billable ICD-10-CM code, FY2026.

Applies from M12 Other and unspecified arthropathy

Excludes1 (never code together)

• arthrosis (M15-M19)
• cricoarytenoid arthropathy (J38.7)

MS-DRG index

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

Approximate ICD-9-CM (GEMs)

• 719.26 Villonodular synovitis, lower leg (approximate)

Code annotations containing back-references to M12.261

Back-references to M12.2

• Type 1 Excludes: M67.2 Synovial hypertrophy, not elsewhere classified ("villonodular synovitis (pigmented) (M12.2-)")

Nearby codes

• M12.25 Villonodular synovitis (pigmented), hip
• M12.251 Villonodular synovitis (pigmented), right hip
• M12.252 Villonodular synovitis (pigmented), left hip
• M12.259 Villonodular synovitis (pigmented), unspecified hip
• M12.26 Villonodular synovitis (pigmented), knee
• M12.261 Villonodular synovitis (pigmented), right knee (this code)
• M12.262 Villonodular synovitis (pigmented), left knee
• M12.269 Villonodular synovitis (pigmented), unspecified knee
• M12.27 Villonodular synovitis (pigmented), ankle and foot
• M12.271 Villonodular synovitis (pigmented), right ankle and foot
• M12.272 Villonodular synovitis (pigmented), left ankle and foot