Oth meniscus derang, ant horn of medial meniscus, l knee

This code signifies a non-traumatic, degenerative, or unspecified derangement affecting the anterior horn of the medial meniscus in the patient's left knee. It indicates a structural abnormality or dysfunction of this specific meniscal segment, often leading to symptoms like pain, locking, or instability.

Apply this code when documentation specifies a derangement of the anterior horn of the medial meniscus in the left knee, without mention of an acute injury or tear. This is appropriate for conditions such as meniscal degeneration, cysts, or other non-traumatic structural abnormalities. Supporting documentation should clearly identify the affected knee (left) and the specific meniscal horn (anterior, medial).

• Ensure laterality (left knee) is clearly documented.
• Distinguish from acute meniscal tears (S83.2- series) which are traumatic in nature.
• Do not use if the derangement is specified as a "bucket-handle tear" or "complex tear," which have more specific codes.