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

This code signifies a non-traumatic tear, degeneration, or other structural abnormality affecting the posterior portion of the medial meniscus in the patient's left knee. It indicates a derangement that is not explicitly classified as a bucket-handle tear, discoid meniscus, or cyst.

Apply this code when documentation specifies a derangement of the posterior horn of the medial meniscus in the left knee, such as a horizontal tear, radial tear, or complex tear, that is not acute or traumatic in nature. Supporting documentation typically includes MRI reports, arthroscopic findings, or physician notes detailing the specific meniscal pathology and location.

• Ensure the documentation clearly specifies "posterior horn" and "medial meniscus" of the "left knee."
• Differentiate from acute traumatic tears (S83.2- series) and other specified meniscal derangements (e.g., M23.31- for bucket-handle tears).
• Always review laterality carefully to select the correct left (2) or right (1) knee code.