Preauthorization is required for some professional services, medical procedures and HCPCS Level II codes. Assistance provider number (do not use NPI) of the billing provider.How do I fill this out? Print your last name, first name, and the first letter of your middle name. 2. Any questions, please email mdh. Use the MPC Pre-Authorization tool to see if a prior authorization is needed. It's quick and easy! Authorization form is complete.