M12.479 Intermittent hydrarthrosis, unspecified ankle and foot

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)

• 719.37 Palindromic rheumatism, ankle and foot (approximate)

Code annotations containing back-references to M12.479

Back-references to M12.4

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

Nearby codes

• 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
• M12.479 Intermittent hydrarthrosis, unspecified ankle and foot (this code)
• M12.48 Intermittent hydrarthrosis, other site
• M12.49 Intermittent hydrarthrosis, multiple sites
• M12.5 Traumatic arthropathy
• M12.50 Traumatic arthropathy, unspecified site
• M12.51 Traumatic arthropathy, shoulder