Which act governs the conduct and regulation of health insurance in the United States?

The McCarran-Ferguson Act is significant because it grants states the authority to regulate the business of insurance, including health insurance. This act was passed in 1945 and established that the regulation of insurance companies is primarily under the jurisdiction of state governments, allowing them to enact laws regarding the conduct of insurers, policy forms, and rates. While other legislation such as HIPAA pertains to privacy and security of health information, and the ACA focuses on health insurance reforms and access to healthcare, they do not primarily govern the regulation of health insurance. Instead, the McCarran-Ferguson Act remains a foundational law that ensures that the state regulation of the insurance industry continues to be upheld, making it the correct choice regarding the governance of health insurance conduct in the United States.