According to a Government Accountability Office (GAO) analysis of 2009 data, hypertension was the most commonly reported medical condition among adults that could result in a health insurer denying coverage, requiring higher-than-average premiums, or restricting coverage. GAO’s analysis found that about 33.2 million adults age 19-64 years old, or about 18%, reported hypertension in 2009. Mental health disorders and diabetes were the second and third most commonly reported conditions among adults. GAO found that between 36 million and 122 million adults reported medical conditions that could result in a health insurer restricting coverage. This represents between 20% and 66% of the adult population, with a midpoint estimate of about 32%.
