Other and unspecified derangement of medial meniscus

This ICD-9-CM code signifies a non-specific internal derangement affecting the medial meniscus of the knee. It encompasses various forms of medial meniscal pathology not otherwise specified, such as tears, degeneration, or other structural abnormalities causing symptoms.

This code is appropriate for documenting medial meniscal pathology when the specific type or cause of derangement is not precisely identified or documented. Use when the physician's diagnosis explicitly states "derangement of medial meniscus" without further detail, or when imaging reports indicate a medial meniscal abnormality without specifying a tear type (e.g., "medial meniscal degeneration").

• Avoid using this code if a more specific diagnosis, such as a specific type of meniscal tear (e.g., bucket-handle, radial), is documented.
• Ensure documentation clearly indicates the medial meniscus as the affected structure.
• Consider sequencing this code after a traumatic injury code if the derangement is acute and injury-related.