Osteochondritis dissecans, left knee

This code signifies a condition where a segment of cartilage and underlying bone separates from the articular surface of the left knee joint. This typically occurs due to a lack of blood supply, leading to avascular necrosis and eventual detachment of the osteochondral fragment. Patients often experience pain, swelling, and mechanical symptoms like locking or catching in the knee.

This code is appropriate for documenting a confirmed diagnosis of osteochondritis dissecans affecting the left knee. Documentation should clearly specify the left side and confirm the diagnosis through imaging studies such as X-rays, MRI, or CT scans, along with clinical findings. It is used when the condition is present and being treated or monitored.

• Ensure laterality is explicitly documented as "left knee" to support this specific code.
• Distinguish from other osteochondral lesions or traumatic avulsion fractures, which have different codes.
• Consider additional codes for associated conditions such as loose bodies (M23.4-) if present and documented.