Fibrous dysplasia (monostotic), multiple sites

This code represents fibrous dysplasia affecting a single bone (monostotic) but occurring in multiple distinct locations within the skeletal system. Fibrous dysplasia is a bone disorder where normal bone is replaced by fibrous tissue and immature woven bone, leading to weakened areas prone to fracture and deformity.

Apply this code when documentation clearly indicates monostotic fibrous dysplasia present in more than one anatomical site. This diagnosis is typically confirmed by imaging studies (e.g., X-rays, CT scans, MRI) and sometimes biopsy. Ensure the physician's notes specify "monostotic" and "multiple sites" to support this specific code.

• Differentiate from polyostotic fibrous dysplasia, which involves multiple bones.
• Ensure documentation specifies "monostotic" even if multiple sites are mentioned, as this distinguishes it from other forms.
• Review imaging reports and pathology findings for definitive diagnosis and site specificity.