The 2018 CAQH Index is the sixth annual report assessing industry progress to reduce the use of manual transactions and eliminate cost. It relies on data submitted through a voluntary, survey-based process. Data was submitted from medical health plans covering 160 million lives, or about half of the insured U.S. population in the year studied based on enrollment reported in AIS’s Directory of Health Plans: 2017. The data submissions from medical plans represent 1.6 billion claims and over 7.8 billion total transactions. Dental health plans contributing data represented 106 million lives, which is approximately 44 percent of the covered dental lives. Dental data submissions represent 730 million transactions.