Loose body in knee, left knee

This code signifies the presence of a detached fragment of cartilage or bone within the synovial joint space of the left knee. These "loose bodies" can cause mechanical symptoms such as locking, catching, pain, and effusion, impairing normal knee function.

Apply this code when documentation clearly indicates a loose body is identified in the left knee, often confirmed by imaging studies like MRI or arthroscopy. This diagnosis is typically made when a patient presents with symptoms of mechanical knee derangement attributable to an intra-articular foreign body.

• Ensure laterality is explicitly documented as "left knee" to support this specific code.
• Distinguish from internal derangement of the knee (e.g., meniscal tears) if a loose body is the primary pathology.
• Consider sequencing this code with codes for underlying conditions that may have led to the loose body, such as osteochondritis dissecans, if applicable.