Osteitis deformans of unspecified forearm

This code signifies Paget's disease (osteitis deformans) affecting an unspecified forearm bone. It indicates a chronic bone disorder characterized by abnormal bone remodeling, leading to enlarged, misshapen, and weakened bones in the forearm region.

Apply this code when documentation confirms a diagnosis of Paget's disease specifically located in the forearm, but the laterality (left or right) is not specified. This code is appropriate when the physician's notes clearly state "Paget's disease of the forearm" without further anatomical detail.

• Avoid using this code if laterality (left or right forearm) is documented; instead, use a more specific code from the M88.83- subcategory.
• Ensure the documentation explicitly states "osteitis deformans" or "Paget's disease" to support this diagnosis.
• Do not confuse with other forms of osteitis or bone disorders; this code is specific to Paget's disease.