C50.412 – Malignant neoplasm of upper-outer quadrant of left female breast

Learn more about the ICD-10-CM code C50.412, the code for Malignant neoplasm of upper-outer quadrant of left female breast.

By Patricia Buenaventura on Aug 8, 2025.

Fact Checked by Ericka Pingol.

Use Code

C50.412 diagnosis code: Malignant neoplasm of upper-outer quadrant of left female breast

The C50.412 is an ICD code that's included in the International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM), and it is used to designate “Malignant neoplasm of upper-outer quadrant of left female breast.”

The utilization of this particular ICD-10 code is restricted to female patients who have received confirmation of a malignant tumor residing in the upper area of their left breast.

This code is specifically designed to provide a precise classification and documentation for cases meeting these specific criteria. It ensures accurate coding and categorization of breast cancer cases in the upper left quadrant, facilitating effective medical record keeping and statistical analysis.

Is the C50.412 billable?

Yes, the C50.412 code is billable and can be used to designate a patient for reimbursement purposes. To add, this code is covered by the Center for Medicare and Medicaid Services.

Clinical information

The term “malignant neoplasm means a tumor is cancerous. In the context of this ICD-10 code, “malignant neoplasm” refers to a cancerous tumor in the upper-outer quadrant of a female patient's left breast. This means that the female patient has breast cancer, or they are at risk of developing it, given the presence of a malignant tumor.

There are several ways to treat breast cancer. These include the following:

Removal of the whole breast (mastectomy) or just the part where the cancer is and some tissue (lumpectomy)
Chemotherapy
Radiation therapy
Hormone therapy
Targeted therapy
Immunotherapy

The treatment will be based on the stage of the cancer.

Synonyms include

Lump in upper outer quadrant of left breast
Malignant neoplasm of breast upper outer quadrant
Malignant neoplasm of upper-outer quadrant of female breast
Neoplasm of upper outer quadrant of female breast
Primary malignant neoplasm of breast upper outer quadrant
Primary malignant neoplasm of upper outer quadrant of female breast

Other ICD-10 codes commonly used for malignant neoplasms in the female breast

C50.011: Malignant neoplasm of nipple and areola, right female breast
C50.012: Malignant neoplasm of nipple and areola, left female breast
C50.111: Malignant neoplasm of central portion of right female breast
C50.112: Malignant neoplasm of central portion of left female breast
C50.211: Malignant neoplasm of upper-inner quadrant of right female breast
C50.212: Malignant neoplasm of upper-inner quadrant of left female breast
C50.311: Malignant neoplasm of lower-inner quadrant of right female breast
C50.312: Malignant neoplasm of lower-inner quadrant of left female breast
C50.411: Malignant neoplasm of upper-outer quadrant of right female breast
C50.412: Malignant neoplasm of upper outer quadrant of left female breast
C50.511: Malignant neoplasm of lower-outer quadrant of right female breast
C50.512: Malignant neoplasm of lower-outer quadrant of left female breast

Commonly asked questions

Yes, this ICD-10 code is billable.

It’s best to use this code once the female patient is confirmed to have malignant tumor in the upper-outer quadrant of their left breast.

This depends on the cancer stage or how bad the tumor is, but treatment can include surgical procedures like mastectomy or lumpectomy of the left breast, and/or various therapies like chemotherapy and hormone therapy.

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