Fibrous dysplasia (monostotic), unspecified upper arm

This code signifies a benign bone disorder characterized by the replacement of normal bone with fibrous tissue, affecting a single bone (monostotic). Specifically, it indicates this condition is present in an unspecified portion of the patient's upper arm. This can lead to weakened bone, pain, and potential deformity.

Apply this code when documentation confirms a diagnosis of monostotic fibrous dysplasia located in the upper arm, and the specific side (left or right) is not documented. This is appropriate for initial diagnoses, follow-up visits, or when managing complications directly related to this condition. Supporting documentation should include imaging reports (X-ray, MRI, CT) and/or pathology reports confirming fibrous dysplasia.

• Only use this code when the laterality (left or right) of the upper arm is not specified in the medical record.
• Distinguish from polyostotic fibrous dysplasia, which involves multiple bones and has different code assignments.
• Ensure documentation clearly states "fibrous dysplasia" and specifies the "upper arm" as the affected site.