ICD-10 Code C50.A2 – Malignant inflammatory neoplasm of left breast (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C50.A2 – Malignant inflammatory neoplasm of left breast
What it is
This code identifies a malignant inflammatory neoplasm in the left breast. Use it when the record documents an inflammatory breast cancer or similar malignant breast process on the left side.
Clinical signs
Typical findings include breast redness, swelling, warmth, and skin thickening or peau d’orange. Clinical features vary; refer to documentation.
When to use this code
Use C50.A2 when the provider clearly documents a malignant inflammatory neoplasm of the left breast. It is appropriate for confirmed left-sided disease in the active encounter, including pathology or specialist notes that support the diagnosis.
Check laterality carefully and code from the documented site, not from suspected symptoms alone. If the record only says inflammatory breast changes without malignancy, this code is not supported.
Do not use for
Do not use this code for benign breast inflammation, mastitis, or nonspecific breast pain. Also avoid it when the documentation does not confirm malignancy or does not specify the left breast.
Coding tip
Verify both malignancy and left-sided laterality in the provider note before assigning C50.A2.