42 CFR § 423.651 - Request for hearing.
(a) Method and place for filing a request.
(1) A request for a hearing must be made in writing and filed by an authorized official of the contract applicant or Part D plan sponsor that was the party to the determination under the appeal.
(2) The request for the hearing must be filed in accordance with the requirements specified in the notice.
(c) Parties to a hearing. The parties to a hearing must be -
(1) The parties described in § 423.650;