M12.421 Intermittent hydrarthrosis, right elbow

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)

• 719.32 Palindromic rheumatism, upper arm (approximate)

Code annotations containing back-references to M12.421

Back-references to M12.4

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

Nearby codes

• M12.41 Intermittent hydrarthrosis, shoulder
• M12.411 Intermittent hydrarthrosis, right shoulder
• M12.412 Intermittent hydrarthrosis, left shoulder
• M12.419 Intermittent hydrarthrosis, unspecified shoulder
• M12.42 Intermittent hydrarthrosis, elbow
• M12.421 Intermittent hydrarthrosis, right elbow (this code)
• M12.422 Intermittent hydrarthrosis, left elbow
• M12.429 Intermittent hydrarthrosis, unspecified elbow
• M12.43 Intermittent hydrarthrosis, wrist
• M12.431 Intermittent hydrarthrosis, right wrist
• M12.432 Intermittent hydrarthrosis, left wrist