ICD-10 Code C50.A0 – Malignant inflammatory neoplasm of unspecified breast (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C50.A0 – Malignant inflammatory neoplasm of unspecified breast
What it is
This code identifies a malignant inflammatory cancer of the breast when the site is not further specified. Use it for documentation that names inflammatory breast cancer but does not identify left or right breast.
Clinical signs
Clinical features vary; refer to documentation. Typical findings may include breast redness, swelling, warmth, and skin thickening consistent with inflammatory breast cancer.
When to use this code
Use this code when the provider documents malignant inflammatory neoplasm of the breast and does not state laterality. It is also appropriate when the record confirms inflammatory breast cancer but the involved breast is unspecified. Check documentation if the diagnosis is uncertain or if a more specific breast site is recorded.
Do not use for
Do not use it for benign breast inflammation, mastitis, or other nonmalignant breast disorders. If the record identifies a specific breast side or a different breast cancer type, choose the more specific code.
Coding tip
Query for laterality whenever the note says inflammatory breast cancer but does not specify the breast.