Pursuant to and not inconsistent with the provisions of sections 208.151 and 208.152, the MO HealthNet division shall by rule and regulation define the reasonable costs, manner, extent, quantity, quality, charges and fees of MO HealthNet benefits herein provided. The benefits available under these sections shall not replace those provided under other federal or state law or under other contractual or legal entitlements of the persons receiving them, and all persons shall be required to apply for and utilize all benefits available to them and to pursue all causes of action to which they are entitled. Any person entitled to MO HealthNet benefits may obtain it from any provider of services with which an agreement is in effect under this section and which undertakes to provide the services, as authorized by the MO HealthNet division. At the discretion of the director of the MO HealthNet division and with the approval of the governor, the MO HealthNet division is authorized to provide medical benefits for participants receiving public assistance by expending funds for the payment of federal medical insurance premiums, coinsurance and deductibles pursuant to the provisions of Title XVIII B and XIX, Public Law 89-97, 1965 amendments to the federal Social Security Act (42 U.S.C. 301, et seq.), as amended.