28 CFR §571.63

1. (a)When an inmate's request is denied by the Warden, the inmate will receive written notice and a statement of reasons for the denial. The inmate may appeal the denial through the Administrative Remedy Procedure (28 CFR part 542, subpart B).
2. (b)When an inmate's request for consideration under 18 U.S.C. 4205(g) or 3582(c)(1)(A) is denied by the General Counsel, the General Counsel shall provide the inmate with a written notice and statement of reasons for the denial. This denial constitutes a final administrative decision.
3. (c)When the Director, Bureau of Prisons, denies an inmate's request, the Director shall provide the inmate with a written notice and statement of reasons for the denial within 20 workdays after receipt of the referral from the Office of General Counsel. A denial by the Director constitutes a final administrative decision.
4. (d)Because a denial by the General Counsel or Director, Bureau of Prisons, constitutes a final administrative decision, an inmate may not appeal the denial through the Administrative Remedy Procedure.