Fibrous dysplasia (monostotic), right forearm

This code signifies a benign, localized bone disorder characterized by the replacement of normal bone with fibrous tissue and immature woven bone, affecting a single bone in the right forearm. This condition can lead to bone weakness, pain, and deformity. It is a developmental anomaly of bone-forming mesenchymal tissue.

Apply this code when documentation clearly indicates a diagnosis of monostotic fibrous dysplasia specifically located in the right forearm. This diagnosis is typically confirmed through imaging studies (e.g., X-ray, MRI) showing characteristic bone lesions and, in some cases, biopsy results. Use this code for initial encounters and subsequent follow-up care related to this specific condition.

• Ensure documentation specifies "monostotic" (single bone involvement) and the exact anatomical location as the right forearm.
• Differentiate from polyostotic fibrous dysplasia (multiple bone involvement), which is coded differently.
• Do not confuse with other benign bone tumors or cysts; the pathology must confirm fibrous dysplasia.