Good introduction to healthcare in the United States?
Healthcare and healthcare insurance in the United States have been the focus of much research by hundreds of health economics in the last several decades. There are many complex economic issues involved. As a first step, I recommend you take a look at the health insurance chapters in Jonathan Gruber's "Public Finance and Public Policy" textbook: https://www.macmillanlearning.com/college/us/product/Public-Finance-and-Public-Policy/p/1319105254