Job-based health insurance is the largest single source of health care coverage in the U.S.
1.) Employer-sponsored insurance covers more than 157 million workers and their dependents.
2.) The next largest source of coverage, Medicaid, insures less than half as many, 63 million.
3.) Medicare enrolls 45 million;
4.) Individual market (on/off Marketplace) provides coverage for about 21 million.
Source: Kaiser Family Foundation (KFF.org)