C50.AMalignant inflammatory neoplasm of breast

C50.A is the ICD-10-CM diagnosis code for malignant inflammatory neoplasm of breast. It belongs to category C50 (malignant neoplasm of breast), block C50 (malignant neoplasms of breast) and chapter 2 (neoplasms). It is a header code, so it can't be reported by itself; one of its 3 subcodes must be used instead.

Within C50 (malignant neoplasm of breast), C50.A is specifically for malignant inflammatory neoplasm of breast. Related codes cover neoplasm of nipple and areola (C50.0), neoplasm of central portion of breast (C50.1), neoplasm of upper-inner quadrant of breast (C50.2), neoplasm of lower-inner quadrant of breast (C50.3), neoplasm of upper-outer quadrant of breast (C50.4), neoplasm of lower-outer quadrant of breast (C50.5), neoplasm of axillary tail of breast (C50.6), neoplasm of overlapping sites of breast (C50.8) and 1 more.

To report this condition, pick the subcode that matches the documentation: C50.A0 (breast), C50.A1 (breast) and C50.A2 (breast).

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

It was added in FY2026, effective October 1, 2025.