8 C.F.R. § 204.314

Appeal.

            (a)
            Decisions that may be appealed.
             (1) Except as provided in paragraph (b) of this section:

        (i) An applicant may appeal the denial of a Form I-800A (including the denial of a request to extend the prior approval of a Form I-800A) and

        (ii) A petitioner may appeal the denial of a Form I-800.

        (2) The provisions of 8 CFR 103.3, concerning how to file an appeal, and how USCIS adjudicates an appeal, apply to the appeal of a decision under this subpart C.

            (b)
            Decisions that may not be appealed.
             There is no appeal from the denial of:

        (1) Form I-800A because the Form I-800A was filed during any period during which 8 CFR 204.307(c) bars the filing of a Form I-800A; or

        (2) Form I-800A for failure to timely file a home study as required by 8 CFR 204.310(a)(3)(viii); or

        (3) Form I-800 that is denied because the Form I-800 was filed during any period during which 8 CFR 204.307(c) bars the filing of a Form I-800;

        (4) Form I-800 filed either before USCIS approved a Form I-800A or after the expiration of the approval of a Form I-800A.

Official source