Z17.420
BillableHormone receptor negative with human epidermal growth factor receptor 2 positive status
This code does not map to an HCC category in any model (V28, V24, ESRD, RxHCC).
What This Code Means
A status code indicating that cancer cells are negative for hormone receptors but positive for HER2, representing a specific aggressive breast cancer subtype.
Coding Tips
- •Use this code when hormone receptor testing is negative and HER2 testing is positive
- •These patients require HER2-targeted therapy but not hormone therapy
Code Hierarchy
└Z17Estrogen, and other hormones and factors receptor status└Z17.4Combined receptor status└Z17.42Hormone receptor negative└Z17.420Hormone receptor negative with human epidermal growth factor receptor 2 positive status
└Z17.420Hormone receptor negative with human epidermal growth factor receptor 2 positive status