28 CFR § 571.61 - Initiation of request - extraordinary or compelling circumstances.
(a) A request for a motion under 18 U.S.C. 4205(g) or 3582(c)(1)(A) shall be submitted to the Warden. Ordinarily, the request shall be in writing, and submitted by the inmate. An inmate may initiate a request for consideration under 18 U.S.C. 4205(g) or 3582(c)(1)(A) only when there are particularly extraordinary or compelling circumstances which could not reasonably have been foreseen by the court at the time of sentencing. The inmate's request shall at a minimum contain the following information:
(1) The extraordinary or compelling circumstances that the inmate believes warrant consideration.
(2) Proposed release plans, including where the inmate will reside, how the inmate will support himself/herself, and, if the basis for the request involves the inmate's health, information on where the inmate will receive medical treatment, and how the inmate will pay for such treatment.
(b) The Bureau of Prisons processes a request made by another person on behalf of an inmate in the same manner as an inmate's request. Staff shall refer a request received at the Central Office to the Warden of the institution where the inmate is confined.