Fibrous dysplasia (monostotic), unspecified shoulder

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 (monostotic). Specifically, it indicates this condition is present in an unspecified shoulder.

Apply this code when documentation confirms a diagnosis of monostotic fibrous dysplasia affecting the shoulder, and the laterality (right or left) is not specified. This diagnosis is typically made based on imaging studies (X-ray, CT, MRI) and sometimes biopsy.

• Ensure documentation explicitly states "monostotic" to differentiate from polyostotic forms.
• Avoid using this code if the specific shoulder (right or left) is documented; instead, choose the more specific M85.011 or M85.012.
• Code any associated pathological fractures separately if present.