Other derangements of patella, left knee

This code signifies a non-traumatic, unspecified functional disturbance or mechanical issue affecting the left kneecap. It covers conditions where the patella is not dislocated or subluxated but is otherwise not functioning correctly, leading to symptoms like pain, instability, or catching.

Use this code when documentation indicates a derangement of the left patella that doesn't fit specific diagnoses like dislocation, subluxation, or chondromalacia. This is appropriate for conditions such as patellar maltracking, patellar tilt, or other unspecified mechanical issues of the patella on the left side.

• Ensure the documentation specifies "left knee" to support laterality.
• Avoid using this code if a more specific patellar condition (e.g., dislocation, subluxation, chondromalacia) is diagnosed.
• Always review the medical record for the underlying cause of the derangement, as this may require additional codes.