About 68% of adults currently enrolled in a marketplace health plan or Medicaid

...sought care from a doctor or hospital or filled a prescription; 62% of those said they would not have been able to access or afford this care prior to getting their new insurance, according to a recent survey.

Source: "Americans' Experiences with Marketplace and Medicaid Coverage," The Commonwealth Fund, June 12, 2015,
http://www.commonwealthfund.org/publications/issue-briefs/2015/jun/experiences-marketplace-and-medicaid