Ensuring network adequacy, transparency and uninterrupted service are all components of legislation recently signed into law by Illinois Gov. Bruce Rauner. An important patient protection measure initiated by the Illinois State Medical Society (ISMS) and supported by U.S. Pain Foundation, House Bill 311 creates new safeguards for Illinoisans impacted by one of the latest trends in health care: the narrowing of physician networks. The law is known as the Network Adequacy Transparency Act (NAT Act).