Osteitis deformans of multiple sites

This code signifies Paget's disease of bone affecting multiple skeletal locations. It represents a chronic disorder of abnormal bone remodeling, characterized by excessive bone resorption followed by disorganized and enlarged bone formation in various sites throughout the body.

Use this code when documentation explicitly states Paget's disease affecting more than one bone or region, such as the skull, spine, pelvis, and long bones simultaneously. Supporting documentation would include imaging reports (X-rays, bone scans) confirming multi-site involvement and physician notes detailing the diagnosis.

• Ensure the documentation clearly specifies "multiple sites" or lists several affected bones to support this code.
• Do not use this code if Paget's disease is localized to a single bone; instead, use the appropriate site-specific code (e.g., M88.811 for skull).
• Consider sequencing this code as a primary diagnosis when it is the main reason for the encounter, or as a secondary diagnosis if it is a co-morbidity impacting treatment.