ICD-10 Code C50.811 – Malignant neoplasm of overlapping sites of right female breast (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C50.811 – Malignant neoplasm of overlapping sites of right female breast
What it is
This code identifies a malignant breast tumor in the right female breast when the cancer spans overlapping anatomic sites and no single site can be assigned more specifically. Use it for documented primary breast malignancy.
Clinical signs
Findings may include a palpable breast mass, skin or nipple changes, asymmetry, or abnormal imaging results. Clinical features vary; refer to documentation and pathology when available.
When to use this code
Use C50.811 when the provider documents primary cancer of the right female breast involving overlapping sites, such as lesions crossing more than one quadrant or region. It is appropriate when the record does not support a more specific breast site code. Confirm laterality and that the diagnosis is malignant.
Do not use for
Do not use this code for benign breast disease, carcinoma in situ, or unspecified breast cancer. Check documentation if the tumor site is not clearly described or if laterality is missing.
Coding tip
Match the code to the documented anatomic overlap and right-sided laterality; if the site is described more specifically, code that site instead.