Truven Health Analytics' Top 15 Health Systems

Large health systems (more than $1.5 billion in operating expenses)

Allina Health - Minneapolis

Mayo Foundation - Rochester, Minn.

OhioHealth - Columbus, Ohio

Spectrum Health - Grand Rapids, Mich.

St. Vincent Health - Indianapolis, Ind.

Medium health systems ($750 million to $1.5 billion)

Alegent Creighton Health - Omaha, Neb.

Exempla Healthcare - Denver

Mercy Health Southwest Ohio Region - Cincinnati

Mission Health - Asheville, N.C.

St. Luke's Health System - Boise, Idaho

Small health systems (less than $750 million)

Asante - Medford, Ore.

Maury Regional Healthcare System - Columbia, Tenn.

Roper St. Francis Healthcare - Charleston, S.C.

Saint Joseph Regional Health System - Mishawaka, Ind.

Tanner Health System - Carrollton, Ga.