This document provides a summary of Medicare claims processing procedures for inpatient hospital billing. It outlines the table of contents which includes sections on general inpatient requirements, payment under the prospective payment system (PPS) diagnosis-related groups (DRGs), additional payment amounts for disproportionate share hospitals, rural hospital flexibility programs, billing coverage and utilization rules, adjustment bills, swing-bed services, and billing instructions for specific situations such as transplants and foreign hospital services. It provides procedural guidance to Medicare contractors for processing inpatient hospital claims.