Oth meniscus derangements, unsp lateral meniscus, unsp knee

This code signifies a non-specific injury or disorder affecting the lateral meniscus of the knee, where the exact nature of the derangement (e.g., tear, cyst, degeneration) is not documented. It indicates a problem with the C-shaped cartilage on the outer side of the knee joint without further specification.

Use this code when documentation clearly identifies a derangement of the lateral meniscus but lacks specific details regarding the type of derangement or the laterality of the knee (e.g., "lateral meniscus derangement, unspecified knee"). This is often an interim diagnosis or used when diagnostic imaging or arthroscopy has not yet provided a definitive diagnosis.

• Avoid using this code if the specific type of lateral meniscus derangement (e.g., tear, cyst) is documented; instead, code to the more specific M23.2- series.
• Ensure the documentation explicitly states "unspecified lateral meniscus" or lacks laterality information for the knee.
• If laterality is known (right or left knee), but the type of derangement is unspecified, use M23.301 (right) or M23.302 (left) respectively.