Other derangements of patella, unspecified knee

This code signifies a non-specific disorder or instability of the kneecap (patella) that doesn't fit into more defined categories like dislocation or subluxation. It indicates a functional disturbance or structural anomaly of the patella within the patellofemoral joint.

Use this code when documentation indicates a patellar derangement without further specification of the type (e.g., "patellar instability," "patellofemoral dysfunction," "deranged patella") and the affected knee is not specified. This code is appropriate when the physician has not yet determined the exact nature of the patellar issue or when the specific type is not clinically relevant for the current encounter.

• Avoid using this code if more specific documentation regarding the patellar derangement (e.g., recurrent dislocation, chondromalacia patellae) is available.
• Always query the provider for laterality (left, right, bilateral) if not documented, as this code defaults to unspecified knee.
• Consider codes from the M22.0-M22.2 series if subluxation or dislocation is specified.