ICD-10 Code C50.129 – Malignant neoplasm of central portion of unspecified male breast (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C50.129 – Malignant neoplasm of central portion of unspecified male breast
What it is
This code identifies a malignant tumor in the central portion of a male breast when the side is not documented. Use it for primary breast cancer involving the nipple or central breast area.
Clinical signs
Common findings include a breast lump, nipple changes, skin dimpling, or nipple discharge. Clinical features vary; refer to documentation and pathology when available.
When to use this code
Use C50.129 when the provider documents primary malignant neoplasm of the central portion of the male breast and does not specify left or right. It also fits confirmed cancer cases pending laterality clarification in the record. Check documentation if the site is described more generally as breast or chest wall.
Do not use for
Do not use this code for benign breast masses, gynecomastia, or unspecified breast cancer without a central-site designation. If the lesion is secondary or metastatic, code that condition instead.
Coding tip
Verify both laterality and exact anatomic site before assigning C50.129.