Derangement of anterior horn of medial meniscus

This code signifies an internal derangement affecting the front portion of the inner C-shaped cartilage in the knee joint. It indicates a structural abnormality or injury to the anterior horn of the medial meniscus, often involving tears, degeneration, or displacement. This condition typically results in knee pain, swelling, and mechanical symptoms.

Apply this code when documentation specifies a derangement or injury localized to the anterior horn of the medial meniscus. This is appropriate for diagnoses such as anterior horn medial meniscal tear, degeneration, or displacement. Supporting documentation should include imaging reports (e.g., MRI) confirming the specific location of the meniscal pathology.

• Ensure the documentation explicitly states "anterior horn" and "medial meniscus" to justify this specific code.
• Differentiate from derangements of other meniscal parts (e.g., posterior horn, lateral meniscus) which have different codes.
• Do not use for general meniscal tears without specific anatomical localization.