Medical service corporations shall have authority to contract with only licensed doctors of medicine, licensed doctors of dental surgery, or licensed podiatrists; provided, however, that all contracts issued by the medical service corporations to members shall contain a provision to be approved by the Commissioner which shall permit the persons with whom made and all persons entitled to medical service under the contract to receive service either in ordinary or emergency cases from any licensed doctor of medicine, licensed doctor of dental surgery, or licensed podiatrist selected by such person and provided that the doctor of medicine, licensed doctor of dental surgery, or licensed podiatrist will be paid by the medical service corporation an amount provided for in the contract of the medical service corporation for nonparticipating licensed doctors of medicine, licensed doctors of dental surgery, or licensed podiatrists.