45 CFR §5.64

1. (a)In our response letter, we notify you of your right to seek judicial review of an adverse determination as set forth in the FOIA at 5 U.S.C. 552(a)(4)(B). Before seeking review by a court of an adverse determination, you generally must first submit a timely administrative appeal.
2. (b)We also inform you that the Office of Government Information Services (OGIS) offers mediation services to resolve disputes between FOIA requesters and Federal agencies as a non-exclusive alternative to litigation. As referenced in § 5.29(b) you may contact OGIS via mail, email, or telephone for assistance.