ICD-10 Code C50.A – Malignant inflammatory neoplasm of breast (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C50.A – Malignant inflammatory neoplasm of breast
What it is
This code identifies a malignant breast cancer with inflammatory features. Use it when the documentation specifically states inflammatory carcinoma or a malignant inflammatory neoplasm of the breast.
Clinical signs
Typical findings include breast redness, warmth, swelling, and skin thickening or peau d’orange. Clinical features vary; refer to documentation for the exact diagnosis and laterality.
When to use this code
Use C50.A when the provider documents malignant inflammatory breast cancer, including inflammatory carcinoma of the breast. It is appropriate when the record clearly links the malignancy to inflammatory breast changes. If the note only says breast cancer with redness or swelling, check documentation before assigning this code.
Do not use for
Do not use this code for benign inflammatory breast disease, mastitis, or unspecified breast cancer without inflammatory features. Do not assume inflammatory carcinoma unless the provider states it.
Coding tip
Confirm the exact wording in the pathology, oncology, or discharge note before coding, and check documentation for laterality or any additional breast cancer details.