Hypertrophy of bone, unspecified femur

This code signifies an abnormal enlargement or overgrowth of bone tissue within the femur, the long bone of the thigh, without further specification of its cause or exact location within the femur. It indicates a non-neoplastic increase in bone mass.

Use this code when documentation clearly states "hypertrophy of bone" affecting the femur, but lacks details regarding the specific part of the femur (e.g., distal, proximal, shaft) or the underlying etiology. This code is appropriate when the physician has not identified a more specific cause such as osteoarthritis, Paget's disease, or a tumor.

• Avoid using this code if a more specific anatomical site within the femur (e.g., M89.351 for right femur, M89.352 for left femur) is documented.
• Always query the provider for greater specificity regarding the cause and location of the hypertrophy if not clearly stated.
• Do not confuse with osteosclerosis (M85.8X) or Paget's disease of bone (M88.X), which have distinct coding pathways.