Recurrent dislocation of patella, left knee

This diagnosis code signifies a condition where the kneecap (patella) repeatedly displaces from its normal position in the trochlear groove of the femur, specifically affecting the left knee. This recurrence distinguishes it from an initial or acute dislocation.

Use this code when documentation clearly indicates a history of multiple patellar dislocations in the left knee. This is typically supported by physician notes detailing recurrent episodes, often requiring reduction or causing functional impairment. It applies to chronic instability of the left patella.

• Ensure documentation specifies "recurrent" or "chronic instability" of the patella, not just a single dislocation.
• Verify the laterality is explicitly stated as "left knee" to avoid laterality errors.
• Differentiate from acute patellar dislocation codes, which would not include the "recurrent" descriptor.