|model||Built Here, Others Use|
|service type||Public Health|
|states||TX, AZ, FL, HI, NJ, OK, WV, CA, NY, DC|
|government type||state, federal|
“VistA is a health information system deployed across all veteran care sites in the United States. VistA provides clinical, administrative, and financial functions.” The system and the front-end GUI are provided as open-source software. The VA has created a version that runs on GT.M on Linux, said to be to meet the needs of private healthcare organizations. It is in use in non-VA healthcare facilities around the U.S. (Whether these extra-VA uses are incidental or intentional to the VA’s development efforts is unclear.) Its use globally is promoted and contributed to via WorldVistA. It is unclear whether WorldVistA is a membership organization.