Other osteonecrosis, multiple sites

This code signifies the death of bone tissue due to a loss of blood supply, affecting multiple distinct anatomical locations. It is used when the specific type of osteonecrosis is not otherwise classified or specified as aseptic, drug-induced, or post-traumatic. This condition can lead to bone collapse and significant joint damage.

Apply this code when documentation clearly indicates osteonecrosis occurring in more than one site (e.g., bilateral femoral heads, shoulder and knee) and the etiology is described as "other" or unspecified. Supporting documentation should detail the affected sites and rule out more specific forms of osteonecrosis.

• Ensure documentation explicitly states "multiple sites" for osteonecrosis.
• Do not use this code if a more specific type of osteonecrosis (e.g., aseptic, drug-induced) is documented, even if multiple sites are involved; use the specific code for that type with an additional site indicator if available.
• Always review the medical record for the underlying cause of osteonecrosis, if known, and code it as a secondary diagnosis.