This guide covers the entire life of a medical bill, from the moment a service is rendered to the moment the last collection entry falls off a credit report. It begins with the pricing architecture that makes medical bills unlike any other consumer charge, and the four documents that resolve most disputes before any legal argument begins. It explains the federal surprise billing framework in operational detail, including which services are covered, what notice and consent can and cannot waive, and how independent dispute resolution allocates the disputed amount between provider and plan without the patient's participation. It covers the good faith estimate and the patient-provider dispute resolution process available to the uninsured. It sets out the financial assistance obligations of tax-exempt hospitals, including the limits on amounts charged and the restrictions on extraordinary collection actions. It then follows the bill into insurance appeals, into third-party collections, onto the credit report, and into court, with the statutes, deadlines, and letters that govern each stage. It closes with special situations: hospital liens, servicemember protections, decedents' bills, and the calculus of bankruptcy.