(a)Definition of grandfathered health plan coverage - (1)In general - (i)Grandfathered health plan coverage means coverage provided by a group health plan, or a health insurance issuer, in which an individual was enrolled on March 23, 2010 (for as long as it maintains that status under the rules of this section). A group health plan or group health insurance coverage does not cease to be grandfathered health plan coverage merely because one or more (or even all) individuals enrolled on March 23,