Derang of ant horn of lat mensc due to old tear/inj, r knee

This diagnosis code signifies a structural disruption of the front portion of the lateral meniscus in the right knee, stemming from a prior injury or tear. This derangement impairs the normal function and stability of the knee joint. It indicates a chronic or previously sustained meniscal issue rather than an acute event.

Apply this code when documentation specifies a chronic or old tear of the anterior horn of the lateral meniscus in the right knee, leading to ongoing derangement. This is appropriate for patients presenting with persistent knee pain, locking, or instability attributable to a past meniscal injury. Supporting documentation includes MRI reports confirming an old tear, arthroscopic findings, or a physician's assessment of a chronic meniscal derangement.

• Differentiate between acute (new) tears and old/chronic tears; this code is specifically for the latter.
• Ensure the documentation clearly specifies the anterior horn of the lateral meniscus and the right knee.
• Consider sequencing this code with other relevant knee conditions, such as osteoarthritis, if present.