Fibrous dysplasia (monostotic), left shoulder

This code signifies a benign bone disorder characterized by the replacement of normal bone with fibrous tissue and immature woven bone, affecting a single bone (monostotic) in the left shoulder region. This leads to weakened bone structure, which can result in pain, deformity, or pathological fractures.

Apply this code when documentation clearly indicates a diagnosis of monostotic fibrous dysplasia specifically located in the left shoulder. This diagnosis is typically confirmed through imaging studies (e.g., X-ray, MRI) and sometimes biopsy.

• Ensure laterality is explicitly documented as "left shoulder" to support this specific code.
• Distinguish from polyostotic fibrous dysplasia, which involves multiple bones and has different ICD-10-CM codes.
• Look for associated symptoms like pain (M25.512) or pathological fracture (M84.4x) to code concurrently if present.