Some Medicare beneficiaries who place 911 calls to request an ambulance might safely be cared for in settings other than the emergency department (ED) at lower cost. Using 2005-09 Medicare claims data and a validated algorithm, we estimated that 12.9-16.2 percent of Medicare-covered 911 emergency medical services (EMS) transports involved conditions that were probably nonemergent or primary care treatable. Among beneficiaries not admitted to the hospital, about 34.5 percent had a low-acuity diagnosis that might have been managed outside the ED. Annual Medicare EMS and ED payments for these patients were approximately $1 billion per year. If Medicare had the flexibility to reimburse EMS for managing selected 911 calls in ways other than transport to an ED, we estimate that the federal government could save $283-$560 million or more per year, while improving the continuity of patient care. If private insurance companies followed suit, overall societal savings could be twice as large.

Five decades ago, hospitals staffed their emergency rooms with rotating community physicians or unsupervised hospital staff. Ambulance service was frequently provided by a local funeral home. Beginning in the late 1960s and accelerating thereafter, emergency care swiftly evolved into its current form. Today, modern emergency departments not only are capable of providing around-the-clock lifesaving care in individual emergencies and disasters. They also conduct timely diagnostic workups, provide access to after-hours acute care, and serve as the "safety net of the safety net" for millions of low-income and uninsured patients. But the field's success has led to a new set of challenges. To overcome them, emergency care must become more integrated, regionalized, prevention oriented, and innovative.

In general, EMS systems are not reimbursed for service unless the patient is transported to an ED. Spokespersons for all nine sites covered by this project said that this policy creates a powerful disincentive to implementing pilot programs to safely reduce EMS use by directing patients to more appropriate sites of care or proactively treating them in their homes. Even though private and public hospitals and payers typically benefit from these programs, they have been generally reluctant to offer support. This raises serious questions about the long-term viability of these programs.

This study confirms that there are important differences between self-reported and externally rated measures of QI success and provides researchers with a methodology and criteria to externally rate measures of QI success.

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