Varus deformity, not elsewhere classified, unspecified knee

This code signifies an outward angulation of the lower leg relative to the thigh at the knee joint, often referred to as "bow-leggedness," when the specific cause is not documented or is unknown. It represents a structural misalignment of the knee that is not attributable to a specific disease or condition classified elsewhere.

Apply this code when documentation indicates a varus deformity of an unspecified knee without further specification of its etiology. This is appropriate when the physician notes "varus deformity of the knee, not otherwise specified" or "bow-legged deformity, unknown cause," and laterality is not specified.

• Ensure documentation explicitly states "unspecified knee" or lacks laterality.
• Avoid using this code if the cause of the varus deformity (e.g., osteoarthritis, trauma) is known and documented.
• Do not confuse with valgus deformity (knock-knee), which is an inward angulation.