- Accident Fund Insurance Company
- Aetna
- Aflac
- Allianz
- American Medical Security
- Assurant Health
- Auto-Owners
- Banner Life
- Basic
- BCBS of MI
- Berkshire Hathaway
- BITCO Insurance Companies
- Canada Life Assurance Company
- Celtic
- Cigna
- Cincinnati Insurance Companies
- CNA Surety
- Colonial Life
- Companion Life
- Conifer
- ConnectCare
- CVS
- Dearborn Natl.
- Delta Dental
- EHIM
- EMC
- Foremost
- Genworth Financial
- Grand River/Benchmark
- Great American
- Guardian Life
- Hanover
- HAP
- Hartford
- HCAP
- HealthPlus
- Humana
- ICW Group
- Jackson National Life
- John Hancock
- Lincoln Financial Group
- Markel
- MassMut.
- MEBS
- MetLife
- Michigan Ins.
- Michigan Millers Mutual Insurance Company
- Mutual of Omaha
- Nationwide
- Natl. Guardian
- Nippon Life
- North American Company
- OneAmerica
- Pacific Life
- Penn Mut.
- Pennvylvania Lumbermans Mut.
- Philadelphia
- Physicians Care
- Principal Financial Group
- Priority Health
- Progressive
- Prudential
- Retailers Mut.
- Safeco
- Selective
- Shenandoah Life
- Sun Life Financial
- Symetra
- Transamerica
- Travelers
- UniCare
- United American
- United Healthcare
- Unum
- USLI
- West Bend