“• Up to 133 million non-elderly Americans—just over half (51 percent) of the non-elderly population—may have a pre-existing condition. This includes 67 million women and girls and 66 million men and boys.
“• The likelihood of having a pre-existing condition increases with age: up to 84 percent of those ages 55 to 64—31 million individuals—have at least one pre-existing condition.
“• Among the most common pre-existing conditions are high blood pressure (46 million people), behavioral health disorders (45 million people), high cholesterol (44 million people); asthma/chronic lung disease (34 million people), heart conditions (16 million people), diabetes (13 million people), and cancer (11 million people).
“• Between 2010 and 2014, when the ACA’s major health insurance reforms first took effect, the share of Americans with pre-existing conditions who went uninsured all year fell by 22 percent, meaning 3.6 million fewer people went uninsured.
“• Tens of millions of Americans with pre-existing conditions experience spells of uninsurance. About 23 percent (31 million) experienced at least one month without insurance coverage in 2014, and nearly one-third (44 million) went uninsured for at least one month during the two-year period beginning in 2013.”
Source: Department of Health and Human Services, Office of the Assistant Secretary for Planning and Evaluation. ASPE Issue Brief: Health Insurance Coverage for Americans with Pre-Existing Conditions: The Impact of the Affordable Care Act. January 5, 2017. https://aspe.hhs.gov/pdf-report/health-insurance-coverage-americans-pre-existing-conditions-impact-affordable-care-act