Coxa magna, unspecified hip

This code describes an abnormally enlarged femoral head, often resulting in an incongruent hip joint. Coxa magna can be congenital or acquired, leading to altered biomechanics, pain, and potentially premature osteoarthritis of the hip.

Use this code when documentation explicitly states "coxa magna" without specifying the affected hip (e.g., "bilateral coxa magna" or "coxa magna noted on imaging without laterality specified"). Supporting documentation would include radiology reports (X-ray, MRI) or orthopedic surgeon's notes detailing the enlarged femoral head.

• Ensure the documentation does not specify a particular hip (left or right); otherwise, a more specific laterality code should be used.
• This code is typically a sequela of other conditions, such as Legg-Calve-Perthes disease or slipped capital femoral epiphysis, which should be coded first if present and active.
• Do not confuse with coxa valga or coxa vara, which describe angulation deformities of the femoral neck, not the size of the femoral head.