In 2013, before the advent of the Affordable Care Act health exchanges, provider-sponsored insurance companies had a 3.2 percent average profit margin, just about the same as insurance industry as a whole, according to A.M. Best Company.
Among the most profitable are Kaiser Permanente and UPMC Health Plan, although the latter was especially hit hard last year by claims for the blockbuster hepatitis C drug Sovaldi.
Seventy-three health systems and providers sold their own health plans on the ACA exchanges this year, and 63 other providers sold co-branded plans with an insurer.
The nation's largest nonprofit health system, Ascension Health, recently spent $50 million to acquire U.S. Health and Life Insurance, a Michigan-based for-profit insurer licensed in 20 states.
Here's a chart showing the top plans based on membership.
Twitter: @AnthonyBrino