Oth meniscus derang, anterior horn of lat mensc, unsp knee

This code signifies a non-traumatic derangement or tear of the anterior horn of the lateral meniscus in an unspecified knee. This includes conditions like degenerative tears, cysts, or other structural abnormalities not caused by an acute injury. It specifically points to the front portion of the outer meniscus.

Apply this code when documentation indicates a derangement of the anterior horn of the lateral meniscus without specifying laterality (left or right knee) and without evidence of an acute traumatic event. Supporting documentation would typically include MRI reports, arthroscopy findings, or physician notes describing meniscal pathology localized to this specific anatomical area.

• Ensure the documentation explicitly states "anterior horn" and "lateral meniscus."
• Do not use for acute traumatic tears; those are coded with S83.2- codes.
• If laterality (left or right knee) is documented, use the more specific M23.341 (right) or M23.342 (left) codes.