The parties to the organization determination are--
(a) The enrollee (including his or her representative);
(b) An assignee of the enrollee (that is, a physician or other provider who has furnished a service to the enrollee and formally agrees to waive any right to payment from the enrollee for that service);
(c) The legal representative of a deceased enrollee's estate; or
(d) Any other provider or entity (other than the MA organization) determined to have an appealable interest in the proceeding. [63 FR 35107, June 26, 1998, as amended at 75 FR 19812, Apr. 15, 2010]