ICD-10 Code C50.511 – Malignant neoplasm of lower-outer quadrant of right female breast (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C50.511 – Malignant neoplasm of lower-outer quadrant of right female breast
What it is
This code identifies a malignant breast tumor located in the lower-outer quadrant of the right female breast. Use it when the record specifies that exact anatomic site.
Clinical signs
Clinical features vary; refer to documentation. Commonly, records describe a breast mass, abnormal imaging, or biopsy-confirmed malignancy in the right lower-outer quadrant.
When to use this code
Use C50.511 when the provider documents primary cancer of the right female breast in the lower-outer quadrant. It also fits pathology, imaging, or operative notes that clearly localize the tumor to this quadrant. If the site is recorded only as right breast, check documentation for a more specific code.
Do not use for
Do not use this code for benign breast lesions, unspecified breast cancer site, or disease in a different breast quadrant. Check documentation if the laterality or exact location is unclear.
Coding tip
Code the most specific breast site documented, and verify laterality before selecting C50.511.