Grandfathered Health Plan source: healthcare.gov
As used in connection with the Affordable Care Act: A group health plan that was created—or an individual health insurance policy that was purchased—on or before March 23, 2010. Grandfathered plans are exempted from many changes required under the Affordable Care Act. Plans or policies may lose their “grandfathered” status if they make certain significant changes that reduce benefits or increase costs to consumers. A health plan must disclose in its plan materials whether it considers itself to be a grandfathered plan and must also advise consumers how to contact the U.S. Department of Labor or the U.S. Department of Health and Human Services with questions. (Note: If you are in a group health plan, the date you joined may not reflect the date the plan was created. New employees and new family members may be added to grandfathered group plans after March 23, 2010).