20 C.F.R. § 416.1720

Whom we refer.

        We will refer you to an approved facility for treatment of your alcoholism or drug addiction if—

        (a) You are disabled;

        (b) You are not blind;

        (c) You are not 65 years old or older; and

        (d) Alcoholism or drug addiction is a contributing factor to your disability.

Official source