Osteonecrosis due to drugs, unspecified toe(s)

This code signifies the death of bone tissue in an unspecified toe, directly caused by the use of certain medications. This condition, also known as avascular necrosis, results from an interruption of blood supply to the bone, leading to bone collapse and potential joint destruction. The drug-induced etiology is a key distinguishing factor.

Apply this code when documentation clearly states osteonecrosis of a toe and explicitly links it to drug therapy (e.g., corticosteroids, bisphosphonates). This diagnosis requires a physician's confirmed assessment of the drug as the causative agent. Use when the specific toe affected is not documented.

• Ensure the medical record explicitly states "drug-induced" or "due to drugs" for the osteonecrosis.
• If the specific toe (e.g., right great toe, left second toe) is documented, use a more specific code from the M87.17- subcategory.
• Sequence this code after the primary condition or reason for the encounter, if applicable, unless the osteonecrosis is the primary reason for the visit.