ICD-10 Code C50 – Malignant neoplasm of breast (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C50 – Malignant neoplasm of breast
What it is
C50 identifies a malignant tumor arising in breast tissue. Use it when the record documents breast cancer, including primary cancers of the breast.
Clinical signs
Common findings include a palpable breast mass, skin or nipple changes, breast pain, or abnormal imaging. Clinical features vary; refer to documentation.
When to use this code
Use C50 when the provider documents a malignant neoplasm of the breast and does not specify a more exact site in the breast. It also applies when the diagnosis is confirmed and the chart supports breast cancer as the active condition. Check laterality and any more specific subcategory before coding.
Do not use for
Do not use C50 for benign breast disease, carcinoma in situ, or secondary malignant neoplasm. If the record names a different breast site more specifically, code that documented site instead.
Coding tip
Review the pathology or operative note for laterality and exact breast site before assigning the final code.