Osteolysis, unspecified thigh

This code signifies the pathological destruction or dissolution of bone tissue in the thigh region, where the specific cause or type of osteolysis is not documented. It indicates a general bone loss process affecting the femur, without further specification of its etiology.

Use this code when documentation clearly states "osteolysis of the thigh" but lacks details regarding the underlying cause (e.g., infection, tumor, aseptic loosening of prosthesis, metabolic disorder). This code is appropriate when the physician has not specified laterality or a more precise anatomical site within the thigh.

• Avoid using this code if a more specific type or cause of osteolysis (e.g., infectious, neoplastic, post-traumatic) is documented; look for codes within M89.5- that provide greater specificity.
• Ensure documentation supports the "unspecified" nature; if laterality (right or left thigh) is noted, a more specific code (M89.551, M89.552) should be used.
• Always query the provider for more specific information regarding the cause and laterality of the osteolysis to allow for more precise coding.