Oth meniscus derang, ant horn of medial meniscus, r knee

This diagnosis code identifies a non-traumatic internal derangement affecting the anterior portion of the medial meniscus in the right knee. This can include conditions such as cysts, degenerative tears, or other structural abnormalities not classified as acute tears. It signifies a problem with the meniscal cartilage that is not due to a recent injury.

Use this code when documentation specifies a derangement of the anterior horn of the medial meniscus in the right knee, without explicit mention of an acute tear. This is commonly seen in patients presenting with chronic knee pain, clicking, or locking, where imaging (MRI) reveals degenerative changes or other non-acute meniscal pathology in the specified location.

• Ensure laterality (right knee) and specific meniscal horn (anterior horn of medial meniscus) are clearly documented.
• Distinguish from acute meniscal tears (S83.2- series) which are typically traumatic and have different coding.
• Do not use if the documentation indicates a posterior horn derangement or a derangement of the lateral meniscus.