ICD-10 Code C50.611 – Malignant neoplasm of axillary tail of right female breast (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C50.611 – Malignant neoplasm of axillary tail of right female breast
What it is
This code identifies a malignant tumor arising in the axillary tail of the right female breast. Use it when documentation specifies that exact breast subsite and laterality.
Clinical signs
Clinical features vary; refer to documentation. Commonly, records describe a breast or axillary-tail mass, localized pain, skin or contour change, or imaging and biopsy findings confirming malignancy.
When to use this code
Assign this code when the provider documents primary cancer in the axillary tail of the right female breast. It is appropriate for confirmed malignant neoplasm, including pathology-supported diagnoses and problem lists that clearly specify this site. Check documentation if the site is described only as breast cancer without subsite or laterality.
Do not use for
Do not use it for benign breast masses, metastatic disease to the breast, or unspecified breast cancer without right-sided axillary-tail documentation. Check documentation if the lesion is in a different breast quadrant or only suspected.
Coding tip
Verify both the exact breast subsite and right-sided laterality before coding, because C50.611 is site-specific.