Idiopathic aseptic necrosis of right humerus

This code signifies the death of bone tissue in the right upper arm bone (humerus) due to a lack of blood supply, without an identifiable cause. This condition, also known as avascular necrosis or osteonecrosis, leads to bone collapse and joint destruction over time.

Apply this code when documentation explicitly states idiopathic aseptic necrosis affecting the right humerus. This diagnosis is typically made based on imaging studies (e.g., MRI, X-ray) showing characteristic bone changes, coupled with the absence of trauma, infection, or other known etiologies.

• Ensure laterality is clearly documented as "right humerus"; do not use for left or unspecified humerus.
• Confirm the "idiopathic" nature; if a cause (e.g., steroid use, trauma) is identified, a more specific code for secondary aseptic necrosis should be used.
• Consider sequencing with codes for associated pain (e.g., M25.511) or joint effusions if present and documented.