Other derangements of patella, right knee

This code signifies a non-specific derangement or internal disorder of the right patella that does not fit more specific diagnoses like dislocation, subluxation, or chondromalacia. It indicates a functional or structural abnormality of the kneecap that impairs its normal movement or stability within the trochlear groove.

Use this code for conditions such as patellar tracking disorders, patellofemoral pain syndrome where a more specific cause isn't identified, or other unspecified internal derangements affecting the right patella. Documentation should clearly indicate a problem with the right patella and rule out more specific diagnoses.

• Ensure laterality is explicitly documented as "right knee" to support the "1" in the 7th character.
• Avoid using this code if a more specific diagnosis, such as patellar subluxation (M22.0X1) or chondromalacia patellae (M22.41), is documented.
• Always review the medical record for the underlying cause or associated conditions that may require additional coding.