Final answer:
The Medicaid preauthorization number should be entered in Block 23 of the CMS-1500 form. It's essential for Medicaid services authorization and needs to be filled in correctly according to Medicaid's guidelines.
Step-by-step explanation:
If applicable, enter the Medicaid preauthorization number in Block 23 of the CMS-1500 health insurance claim form. This preauthorization number is a critical piece of information that proves Medicaid has authorized the services you're invoicing for. When completing the CMS-1500 form, ensure to follow Medicaid's guidelines carefully to avoid any issues with the claim processing.