Idiopathic aseptic necrosis of left toe(s)

This code signifies the spontaneous death of bone tissue in the left toe(s) due to a lack of blood supply, without an identifiable underlying cause such as trauma or infection. This condition, also known as avascular necrosis, leads to bone collapse and joint destruction.

Apply this code when documentation explicitly states idiopathic aseptic necrosis affecting the left toe(s). This diagnosis is typically made based on imaging studies (e.g., X-ray, MRI) showing bone infarction and collapse, in conjunction with a thorough patient history ruling out secondary causes.

• Ensure laterality is clearly documented as "left toe(s)"; if unspecified, query the provider.
• Distinguish from traumatic avascular necrosis, which would be coded differently.
• Code any associated pain or functional limitations separately if documented.