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

This diagnosis code signifies a non-traumatic injury or degenerative condition affecting the posterior portion of the medial meniscus in the right knee. It encompasses various derangements such as tears, cysts, or other structural abnormalities not specifically classified elsewhere.

This code is appropriate for documenting a patient presenting with symptoms like pain, locking, or instability in the right knee, where diagnostic imaging (e.g., MRI) or arthroscopy confirms a derangement of the posterior horn of the medial meniscus. Documentation should clearly specify the right knee and the medial meniscus involvement.

• Ensure laterality is explicitly documented as "right knee" to support this specific code.
• Distinguish from traumatic tears (S83.2- series) unless the derangement is clearly non-traumatic or degenerative.
• Avoid using for unspecified meniscus derangements; seek clarification if the specific horn or meniscus is not documented.