D04.5

What This Code Means

This code describes an early stage of skin cancer on the trunk (chest, back, abdomen, or sides) where abnormal cells are present but have not yet spread to deeper layers or other parts of the body. It represents a precancerous condition that requires treatment to prevent progression to invasive cancer.

Coding Tips

• •Carcinoma in situ is considered a malignant neoplasm in ICD-10-CM, so code D04.5 should be reported as a primary diagnosis when this is the confirmed diagnosis
• •Specify the exact location on the trunk when documentation is available (e.g., chest wall, back, abdomen) to ensure accurate coding, and verify whether this is a new diagnosis or follow-up care to determine if additional codes for history or status are needed