VistA - Veteran's Administration Software
The Veterans Health Information Systems and Technology Architecture (VistA) is an enterprise-wide information system built around an electronic health record, used throughout the United States Department of Veterans Affairs (VA) medical system, known as the Veterans Health Administration (VHA).[1] By 2001, the VHA was the largest single medical system in the United States, providing care to 4 million veterans, employing 180,000 medical personnel and operating 163 hospitals, over 800 clinics and 135 nursing homes.[2] By providing electronic health records capability, VistA is thereby one of the most widely used EHRs in the world.

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