Osteonecrosis due to drugs of unspecified radius

This code signifies the death of bone tissue in the shaft of the radius, specifically attributed to the adverse effects of medication. It indicates a drug-induced osteonecrosis affecting the diaphysis of the right radius.

Apply this code when documentation clearly states osteonecrosis of the right radial shaft caused by a drug, but the specific drug is not identified. This diagnosis is typically supported by imaging studies (e.g., MRI, X-ray) showing bone necrosis and a patient history of drug exposure.

• Ensure the documentation specifies the right radius and the diaphysis (shaft) for accurate coding.
• Do not use this code if the drug causing the osteonecrosis is known; instead, use a more specific code from the M87.1- series with an additional code for the adverse effect of the drug.
• Verify that the osteonecrosis is explicitly linked to drug use, not other etiologies like trauma or radiation.