Other secondary osteonecrosis, unspecified finger(s)

This code signifies bone tissue death in an unspecified finger due to an underlying condition other than trauma, infection, or radiation. It represents a non-traumatic, non-infectious, and non-radiation-induced avascular necrosis affecting the phalanges or metacarpals of an unspecified finger.

Use this code when documentation clearly indicates osteonecrosis in a finger, and the etiology is secondary to a systemic disease (e.g., lupus, sickle cell anemia, corticosteroid use) but not specified further than "other secondary." The physician's notes should explicitly state "other secondary osteonecrosis" or describe a secondary cause without specifying the exact type.

• Ensure the documentation specifies "unspecified finger(s)" if a more precise location (e.g., right index finger) is not provided.
• Distinguish this from primary (idiopathic) osteonecrosis (M87.0-) and osteonecrosis due to specific causes like trauma (M87.1-), drugs (M87.2-), or radiation (M87.8-).
• Always sequence the underlying systemic disease causing the secondary osteonecrosis first, if known and documented.