Derang of medial meniscus due to old tear/inj, left knee

This code signifies a chronic internal derangement of the medial meniscus in the left knee, specifically resulting from a previously sustained tear or injury. It indicates ongoing mechanical symptoms or instability attributable to the old meniscal damage, rather than an acute event.

Apply this code when documentation clearly indicates a history of a medial meniscal tear or injury in the left knee, and the patient is currently experiencing symptoms such as locking, clicking, or pain due that old damage. This code is appropriate for chronic conditions where the initial injury is no longer acute.

• Ensure documentation specifies "old tear" or "chronic injury" to differentiate from acute tears.
• Laterality (left knee) is crucial for accurate code selection; verify the affected knee.
• Do not use for acute meniscal tears; refer to codes within M23.20-M23.29 for acute derangements.