5 C.F.R. § 839.1303
Are there any types of decisions that I cannot appeal?
Yes, OPM's decisions under subpart L (Discretionary Actions by OPM) are final and conclusive and are not subject to administrative or judicial review.
Yes, OPM's decisions under subpart L (Discretionary Actions by OPM) are final and conclusive and are not subject to administrative or judicial review.