U.S. hospitals spend roughly $20 billion to treat the nearly 2 million Americans injured seriously enough each year to require inpatient care, according to a new report by the Agency for Healthcare Research and Quality (AHRQ; Washington). AHRQ said that Medicare and Medicaid are billed for almost half of all injury cases, and more than 12% of hospital stays of injured patients are uninsured (38% of injury hospital stays), causing nearly 475,000 admissions and accounting for 68% of all injury hospitalizations in patients 65 and older.