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

This code signifies a chronic internal derangement of the medial meniscus in the right knee, specifically attributed to a prior tear or injury that has since healed or stabilized. The term "derangement" indicates a disruption of the normal anatomical relationship or function of the meniscus, impacting knee joint mechanics. The unspecified nature of the tear means the specific type (e.g., bucket handle, radial) is not documented.

Apply this code when documentation clearly indicates a long-standing or old injury to the right medial meniscus, leading to ongoing symptoms of derangement such as clicking, locking, or instability. This code is appropriate when the physician explicitly states "old tear," "chronic injury," or similar terminology, and the specific type of tear is not identified.

• Ensure documentation specifies "old" or "chronic" to differentiate from acute meniscal tears.
• Verify the laterality (right knee) is clearly stated; separate codes exist for the left or bilateral knees.
• Do not use this code if the tear is acute or the specific type of tear (e.g., bucket handle) is documented, as more specific codes would then apply.