12 C.F.R. § 1081.110
(a) Definitions.
(1) For purposes of this section, ex parte communication means any material oral or written communication relevant to the merits of an adjudication proceeding that was neither on the record nor on reasonable prior notice to all parties that takes place between:
(b) Prohibited ex parte communications. During the pendency of an adjudication proceeding, except to the extent required for the disposition of ex parte matters as authorized by law or as otherwise authorized by this part: