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ICD-10-CM 2027

ICD-10 code for breast cancer

C50.91

Malignant neoplasm of breast of unspecified site, female

Header — needs a more specific code

From the official ICD-10-CM alphabetic index entry “Cancer › breast”. Page updated September 29, 2026.

About coding breast cancer

The ICD-10-CM code for breast cancer is C50.91 (Malignant neoplasm of breast of unspecified site, female).

Within C50.9 (malignant neoplasm of breast of unspecified site), C50.91 is specifically for malignant neoplasm of breast of unspecified site, female. Related codes cover male (C50.92).

To report this condition, pick the subcode that matches the documentation: C50.911 (breast), C50.912 (breast) and C50.919 (breast).

Use an additional code to identify estrogen, and other hormones and factors receptor status (Z17.-).

Common questions about breast cancer ICD-10 codes

What is the ICD-10 code for breast cancer?

C50.91 — Malignant neoplasm of breast of unspecified site, female (a header code; report a more specific subcode).

Is C50.91 billable?

No. C50.91 is a header code. Report one of its more specific subcodes instead.