This guide covers a health coverage denial from the first letter through litigation years later. Part 1 explains the four coverage systems and why identifying yours governs every later step. Part 2 covers the ERISA claims procedure and the procedural rights it creates. Part 3 covers the claim file, which is the move that decides most cases. Part 4 covers the internal appeal and how to write it. Part 5 covers external review. Part 6 covers the Medicare ladders and the fast-track termination review measured in hours. Part 7 covers litigation, the standard of review, and preemption. Parts 8 through 11 cover the seven denial categories, long-term disability, billing, and practice notes by role.