Tear of medial cartilage or meniscus of knee, current

This code signifies an acute injury involving a tear of the medial meniscus, the C-shaped cartilage on the inner side of the knee joint. This injury typically results from a sudden twisting motion or direct trauma to the knee, leading to pain, swelling, and mechanical symptoms.

Apply this code when documentation clearly indicates a current, acute tear of the medial meniscus. This is appropriate for initial encounters for such injuries, often supported by physical examination findings, MRI reports confirming the tear, or arthroscopic findings.

• Differentiate from chronic or old tears; this code is for current injuries.
• Ensure laterality (right/left) is documented, though not specified in this particular ICD-9 code.
• Consider additional codes for associated injuries, such as ligamentous tears, if present.