ICD-10-CM > Z00-Z99 > Z17-Z17 > Z17 > Z17.4 > Z17.42 Z17.42 Hormone receptor negative Non-Billable/Non-Specific Applicable To HR- Codes Z17.420Hormone receptor negative with human epidermal growth factor receptor 2 positive statusZ17.421Hormone receptor negative with human epidermal growth factor receptor 2 negative status