ICD-10 Code C50.212 – Malignant neoplasm of upper-inner quadrant of left female breast (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C50.212 – Malignant neoplasm of upper-inner quadrant of left female breast
What it is
This code identifies a malignant tumor located in the upper-inner quadrant of the left female breast. Use it when documentation specifies this exact breast site and laterality.
Clinical signs
Clinical features vary; refer to documentation. Breast cancer may present as a palpable mass, skin or nipple changes, or abnormal imaging findings confirmed as malignant.
When to use this code
Use C50.212 when the provider documents primary malignant neoplasm of the upper-inner quadrant of the left female breast. It also fits pathology or imaging reports that clearly localize the cancer to this site. If the record only says “left breast” or another quadrant, check documentation before coding.
Do not use for
Do not use this code for benign breast lesions, carcinoma in situ, or malignant neoplasms of other breast quadrants. Do not assume the site if the record is nonspecific; check documentation.
Coding tip
Verify both laterality and quadrant in the final pathology or provider note before assigning C50.212.