Derangement of lat mensc due to old tear/inj, right knee

This code signifies a chronic derangement of the lateral meniscus in the right knee, specifically due to a prior tear or injury that has since healed or stabilized. It indicates ongoing mechanical symptoms or dysfunction stemming from the old meniscal damage, rather than an acute injury.

Use this code for patients presenting with persistent right knee pain, locking, clicking, or instability attributed to an old, previously documented lateral meniscal tear. Documentation should clearly state "old tear," "chronic injury," or similar terminology, and specify the lateral meniscus and right knee.

• Ensure documentation explicitly states "old tear" or "chronic injury" to differentiate from acute meniscal tears.
• Verify laterality (right knee) and specific meniscus (lateral) are clearly documented.
• Do not use for acute meniscal tears; refer to the M23.2- series for acute derangements.