ICD-10 Code C50.829 – Malignant neoplasm of overlapping sites of unspecified male breast (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C50.829 – Malignant neoplasm of overlapping sites of unspecified male breast
What it is
This code identifies a malignant breast tumor in a male patient when the cancer overlaps two or more breast sites and the exact site is not specified. Use it for documented primary breast malignancy in an unspecified male breast location.
Clinical signs
Clinical features vary; refer to documentation. Commonly recorded findings include a breast mass, nipple changes, skin dimpling, or axillary lymph node enlargement, but the diagnosis must be supported by provider documentation.
When to use this code
Use this code when the record states malignant neoplasm of overlapping sites in the male breast and does not identify a more specific site. It is appropriate when the provider documents breast cancer in an unspecified male breast location. If laterality or a more precise site is available, code that detail instead.
Do not use for
Do not use this code for benign breast disease, carcinoma in situ, or secondary malignant neoplasm of the breast. Check documentation if the tumor site is known and a more specific breast code applies.
Coding tip
Confirm that the record clearly supports a primary male breast malignancy before assigning C50.829.