A new McKinsey & Co. report looks at the dainting challenges  of provider-led health-insurance plans and asks whether they will just repeat the mistakes of the 1990’s.

Thirteen percent of all U.S. health systems now  offer insurance in one or more market.

The report says that special circumstances explain the success of the few health systems that have succeeded — such as Intermountain Healthcare, Geisinger and the University of Pittsburgh Medical Center.