M12.461 Intermittent hydrarthrosis, 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)

• 719.36 Palindromic rheumatism, lower leg (approximate)

Code annotations containing back-references to M12.461

Back-references to M12.4

• Type 1 Excludes: M25.4 Effusion of joint ("intermittent hydrarthrosis (M12.4-)")

Nearby codes

• M12.45 Intermittent hydrarthrosis, hip
• M12.451 Intermittent hydrarthrosis, right hip
• M12.452 Intermittent hydrarthrosis, left hip
• M12.459 Intermittent hydrarthrosis, unspecified hip
• M12.46 Intermittent hydrarthrosis, knee
• M12.461 Intermittent hydrarthrosis, right knee (this code)
• M12.462 Intermittent hydrarthrosis, left knee
• M12.469 Intermittent hydrarthrosis, unspecified knee
• M12.47 Intermittent hydrarthrosis, ankle and foot
• M12.471 Intermittent hydrarthrosis, right ankle and foot
• M12.472 Intermittent hydrarthrosis, left ankle and foot