ICD-10 Code C50.41 – Malignant neoplasm of upper-outer quadrant of breast, female (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C50.41 – Malignant neoplasm of upper-outer quadrant of breast, female
What it is
C50.41 identifies a malignant tumor located in the upper-outer quadrant of the female breast. Use it when documentation specifies this breast subsite and confirms cancer.
Clinical signs
Clinical features vary; refer to documentation. Findings may include a breast mass, skin or nipple changes, or imaging and pathology confirming malignancy in the upper-outer quadrant.
When to use this code
Use this code when the provider documents primary breast cancer in the upper-outer quadrant of a female breast. It is appropriate for confirmed malignant neoplasm, whether newly diagnosed or under active evaluation, when the site is clearly stated.
If laterality or exact quadrant is recorded elsewhere, code the documented location as written. Check documentation when the record only says breast cancer without a specific quadrant.
Do not use for
Do not use it for benign breast lesions, unspecified breast cancer site, or male breast cancer. Check documentation if the lesion is metastatic to the breast rather than a primary breast malignancy.
Coding tip
Capture the exact quadrant from the pathology or provider note; if the site is not explicit, do not assume C50.41.