Crozer-Keystone Health System was created in 1922.
Erlanger Health System was created in 1889.
Sparrow Health System was created in 1912.
Niagara Health System was created in 2005.
Benefis Health System was created in 1996.
Mission Health System was created in 1998.
Alegent Health System was created in 1996.
Riverside Health System was created in 1916.
Adventist Health System was created in 1973.
Genesis Health System was created in 1869.
CentraCare Health System was created in 1995.
Saint Luke's Health System was created in 1882.
University of Michigan Health System was created in 1850.