May 23, 2023 15:18 Follow Anyone who can legally sign documents for your office. Related articles We are changing our National Provider Identifier (NPI). Do we have to fill out a new Web Portal enrollment? Why can’t the provider’s office and billing company have just one login or use one email address? The provider does not have an office. The billing company’s address is considered their office. How do I fill out the Web Portal Enrollment paperwork? What proof needs to be provided to CSHCS eligibility for new Autism patient? We have a billing company. Do we have to fill out the Web Portal form too?