Office Administrative Assistant Practice Exam

Block 25 on the CMS-1500 form is designated for the billing provider's National Provider Identifier (NPI). The NPI is a unique identification number for healthcare providers in the United States, which is central to the process of billing for medical services. Having the NPI in Block 25 ensures that claims can be correctly attributed to the specific provider delivering the services.

The other options, while relevant in healthcare billing, are not reported in Block 25. The medical license number is not a required entry on the CMS-1500 and is regulated differently depending on state requirements. The Tax Identification Number (TIN) is typically reported in Block 25, but the NPI takes precedence for provider identification purposes. The facility number, referring to a specific location where services are provided, would be documented elsewhere on the form, as it is not the focus of Block 25.

Thus, the understanding of the NPI's significance in the billing process highlights why this is the correct answer for Block 25 on the CMS-1500 form.