As many people with fertility issues quickly learn — 7.4 million women used infertility services from 2006 to 2010 — few employers and insurers pay for many procedures, including in vitro fertilization. Though 65 percent of businesses with more than 500 employees will pay for an initial evaluation by a fertility specialist, just 27 percent cover in vitro fertilization, according to a 2013 study conducted by Mercer, a consulting firm. (That number was 23 percent in 2012.) Drug therapies were covered by 41 percent of large employers, according to the study.