Recurrent subluxation of patella, right knee

This code signifies an unstable right kneecap that repeatedly slips out of its normal groove. It indicates a chronic or recurring issue where the patella displaces, often causing pain, instability, and functional limitation.

Apply this code when documentation explicitly states recurrent or habitual subluxation of the patella affecting the right knee. This diagnosis is typically supported by a history of multiple episodes of patellar instability, physical examination findings, and sometimes imaging studies confirming patellar maltracking or laxity.

• Differentiate from acute patellar subluxation (M22.01) which describes a single, initial event.
• Ensure laterality is clearly documented as right knee; do not use for bilateral or unspecified cases.
• Consider additional codes for underlying causes or associated conditions, such as patellofemoral pain syndrome (M22.2X) if documented.