Non-pressure chronic ulcer of left calf w necrosis of bone

This code signifies a persistent, open sore on the lower portion of the left leg, specifically the calf, that is not caused by pressure. The ulceration has progressed to involve the underlying bone tissue, indicating severe tissue damage. This condition is typically associated with underlying vascular insufficiency, neuropathy, or other systemic diseases.

Apply this code when documentation clearly states a chronic, non-pressure ulcer located on the left calf with confirmed necrosis of the bone. This diagnosis requires physician documentation specifying the laterality, chronicity, and the extent of tissue involvement down to the bone. Supporting documentation may include imaging reports (e.g., X-ray, MRI) confirming osteomyelitis or bone death.

• Ensure the documentation explicitly states "necrosis of bone" and not just "deep tissue involvement" or "exposed bone."
• Always verify laterality (left calf) to avoid common coding errors.
• Code any underlying conditions contributing to the ulcer (e.g., peripheral artery disease, diabetes with neuropathy) as additional diagnoses.