The Affordable Care Act (ACA), sometimes called Obamacare, set rules for health insurers, including requiring coverage for contraceptives and not charging women higher premiums than men. If you buy health insurance on Healthcare.gov (the federal Health Insurance Marketplace) or your state’s marketplace, the options will include these protections. But if you buy insurance another way, you might not be protected. Those plans may not cover everything you think they do and they can deny coverage for preexisting conditions, which a prior endometriosis diagnosis would be.