Other secondary osteonecrosis, other site

This code signifies bone death in a location other than the specific sites covered by more granular codes, where the osteonecrosis is a consequence of another underlying condition or treatment. It indicates that the bone tissue has died due to a compromised blood supply, but this is secondary to a primary disease process or external factor.

Apply this code when documentation specifies secondary osteonecrosis affecting an unspecified or less common anatomical site (e.g., foot, ankle, wrist, jaw) not covered by more specific M87.3x codes. Supporting documentation should clearly link the osteonecrosis to an underlying cause such as corticosteroid use, alcoholism, trauma, or a systemic disease.

• Ensure the documentation explicitly states "secondary" osteonecrosis and specifies an "other site" to differentiate from primary or idiopathic forms.
• Always sequence the underlying cause of the secondary osteonecrosis first, if known and applicable, as this code is a manifestation code.
• Avoid using this code if a more specific M87.3x code exists for the documented anatomical location (e.g., M87.31x for shoulder, M87.32x for humerus).