The law is already enumerated where individuals can sue if denied access to *qualified* providers (42 U. S. C. §1396a(a)(23) State Plans for Medicare Providers).
Apparently you are another one of those who think an entity defrauding tax payers (Engaging in Medicare/Medicaid FRAUD), breaking clinical and sanitary regulations/laws as well as allegedly selling aborted baby parts is a qualified Medicare provider. States do indeed have that right to deny practitioners contracts for just cause. Individuals who want to sue the State to protect entities violating laws, not so much (Because of the *qualified* provisions).
Obviously you think the mistress of a doctor who murdered his wife and kids should be able to sue the State for exercising the law. The doctor should have never been prosecuted, convicted, and imprisoned in the first place from your point of view.