Varus deformity, not elsewhere classified, unspecified ankle

This code signifies an inward angulation of the ankle joint, where the distal part of the limb is deviated towards the midline of the body. It describes a structural abnormality of the ankle that is not congenital or due to a specific underlying condition classified elsewhere. The "unspecified ankle" indicates that the laterality (right or left) is not documented.

Apply this code when documentation clearly states "varus deformity of the ankle" without specifying the affected side or an underlying cause. This is appropriate for acquired varus deformities where the etiology is unknown or not explicitly linked to another condition. Supporting documentation would include physician notes describing the physical examination findings of an inward angulation of the ankle.

• Avoid using this code if the laterality (right or left ankle) is documented; instead, use the more specific codes for right (M21.171) or left (M21.172) ankle varus deformity.
• Do not use this code if the varus deformity is congenital (Q68.8) or secondary to a specific disease process that has its own code.
• Query the provider for laterality if not specified to allow for more precise coding.