Creates provisions relating to conduct affecting health care provider networks

SB 1644 bans specific restrictive clauses in health care provider network contracts, directly affecting health insurance plans (as "general contracting entities") and health care providers. It prohibits "anti-steering" clauses (limiting provider recommendations), "anti-tiering" clauses (restricting network structure), "gag" clauses (hiding price/quality data), and "most-favored-nation" clauses (forcing rate parity). Existing contracts containing these clauses are void and unenforceable, while other contract terms remain valid. The bill also requires insurers to act in enrollees' best interest when designing networks or offering incentives, improving price transparency and choice for patients.