Other secondary osteonecrosis, left toe(s)

This code signifies osteonecrosis of the left toe(s) that is a consequence of another underlying condition or treatment, rather than a primary idiopathic cause. It indicates the death of bone tissue in the left toe(s) due to insufficient blood supply, secondary to a systemic disease, medication, or trauma.

Apply this code when documentation clearly states secondary osteonecrosis affecting any of the left toes. This is appropriate for conditions like steroid-induced osteonecrosis, osteonecrosis secondary to lupus, or post-traumatic osteonecrosis of the left toe(s). The medical record should specify the left side and the secondary nature of the osteonecrosis.

• Always code the underlying primary condition first, followed by this code for the secondary osteonecrosis.
• Distinguish carefully between primary (idiopathic) osteonecrosis and secondary osteonecrosis; this code is specifically for the latter.
• Ensure laterality is clearly documented as "left toe(s)" to support this specific code.