AHA Coding Clinic® for ICD-10-CM and ICD-10-PCS - 2025 Issue 4; New/Revised ICD-10-CM Codes

Malignant Inflammatory Neoplasm of Breast

New codes have been created to identify malignant inflammatory neoplasm of breast, also known as inflammatory breast cancer (IBC). IBC is classified in the new subcategory C50.A, Malignant inflammatory neoplasm of breast, with unique codes to identify laterality as follows: right breast (C50.A1), left breast (C50.A2), and unspecified breast (C50.A0). Malignant inflammatory neoplasm of breast is a distinct subtype of invasive cancer of the breast that accounts for 1% to 5% of all breast cancer in the United States. This breast cancer presents as erythema involving a third or more of the breast, with...

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