Flexion deformity, left knee

This code indicates a fixed or persistent bending of the left knee joint, where the knee cannot be fully extended to a straight position. This deformity can result from various underlying conditions affecting the joint, muscles, or surrounding soft tissues, leading to restricted range of motion.

Apply this code when documentation explicitly states a flexion deformity of the left knee. This typically occurs in conditions such as arthritis, contractures following injury or surgery, or neuromuscular disorders. Supporting documentation should include physical exam findings noting limited extension and a diagnosis of flexion deformity.

• Ensure laterality is accurately documented and coded (left vs. right vs. bilateral).
• Do not confuse with other knee deformities like valgus or varus, which involve angulation rather than a fixed bend.
• Code any underlying cause of the flexion deformity (e.g., osteoarthritis, cerebral palsy) as a primary or secondary diagnosis, as appropriate.