Unspecified acquired deformity of unspecified thigh

This code signifies an acquired structural abnormality of the thigh that lacks specific identification regarding its nature or cause. It indicates a deviation from normal anatomical form in the thigh region, but the precise type of deformity (e.g., angulation, shortening, rotation) is not documented.

Use this code when documentation indicates an acquired deformity of the thigh, but the specific type or laterality of the deformity is not specified by the provider. This is typically a last resort when more specific codes cannot be assigned due to insufficient clinical detail.

• Avoid using this code if the laterality (right or left thigh) is documented; instead, use M21.951 or M21.952.
• Always query the provider for more specific details regarding the type and laterality of the deformity before assigning this unspecified code.
• Consider if a more specific code from the M21 category (e.g., M21.0- for foot drop, M21.1- for varus/valgus deformity) could be used if further information is available.