Niagara Health System was created in 2005.
The Niagara was created in 1925.
Alegent Health System was created in 1996.
Benefis Health System was created in 1996.
Riverside Health System was created in 1916.
Genesis Health System was created in 1869.
Erlanger Health System was created in 1889.
Sparrow Health System was created in 1912.
CentraCare Health System was created in 1995.
Adventist Health System was created in 1973.
Mission Health System was created in 1998.
University of Michigan Health System was created in 1850.
Henry Ford Health System was created in 1915.