Medical debt is the only consumer debt most people acquire without ever agreeing to a price, and almost every strange feature of this field follows from that fact. This article explains how a hospital bill is actually built, why the first number on it corresponds to nothing, and what obligations a tax-exempt hospital has to help patients who cannot pay. It walks through the financial assistance rules that most eligible patients never use, the surprise billing protections that cover some encounters and not others, and the collection practices that turn an unpaid bill into a judgment and a garnishment. It then covers the credit reporting changes that removed much medical debt from consumer files without removing the debt itself. It closes with the practical sequence that actually reduces a bill and the systemic reasons the problem persists.