When Congress passed the Affordable Care Act in 2010, its authors cited three overarching goals: to improve access to health care, to slow rising medical costs and to improve health outcomes. One of the main vehicles for achieving all three missions was a requirement that health insurers provide preventive health care services at no cost to patients. If there were no financial barriers, backers argued, patients would be more likely to get preventive services, from colonoscopies to vaccines to heart disease screenings, which would help keep people healthier and out of the hospital and, conseque…