What is the phone number for molina insurance? The Customer Service Phone Number of Molina Insurance is: +1-888-562-5442, +1-562-435-3666. Molina Healthcare is a provider of healthcare services, based in the United States. The company has presence in various states and serves millions of people across the nation.What is the phone number for molina health? Molina Healthcare/Molina Medicare Prior Authorization Request Form. Phone Number: (888) 483-0760 Medicaid/CHIP Fax Number: (866) 472-0589. Medicare Fax Number: (866) 504-7262.