ICD-10 Code C50.821 – Malignant neoplasm of overlapping sites of right male breast (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C50.821 – Malignant neoplasm of overlapping sites of right male breast
What it is
C50.821 identifies a malignant breast cancer in a male patient when the tumor overlaps more than one site within the right breast. Use it when documentation specifies overlapping sites rather than a single breast quadrant or central location.
Clinical signs
Clinical features vary; refer to documentation. Commonly recorded findings include a right breast mass, nipple changes, skin dimpling, or abnormal imaging and biopsy results confirming malignancy.
When to use this code
Use this code when the provider documents primary malignant neoplasm of overlapping sites in the right male breast. It applies when the cancer spans two or more adjacent breast regions and the laterality is right. Confirm the site wording in the pathology, imaging, or assessment note.
Do not use for
Do not use this code for benign breast disease, unspecified breast cancer site, or malignancy in the left breast. If the record does not clearly state overlapping sites or right-sided involvement, check documentation.
Coding tip
Match the code to the exact anatomic wording in the note; “overlapping sites” is not interchangeable with a single-site or unspecified breast tumor.