HCPCS code J9395: Injection fulvestrant, 25 mg

The brand name is Faslodex®. However, generic versions of fulvestrant are also available.

You should bill 20 units (500 mg divided by 25 mg per unit).

While it's not always required by every payer, it is a common requirement. It is best practice to check with the specific insurance company before administration to avoid claim denials.