42 CFR § 431.231 - Reinstating services.
(b) The reinstated services must continue until a hearing decision unless, at the hearing, it is determined that the sole issue is one of Federal or State law or policy.
(c) The agency must reinstate and continue services until a decision is rendered after a hearing if -
(2) The beneficiary requests a hearing within 10 days from the date that the individual receives the notice of action. The date on which the notice is received is considered to be 5 days after the date on the notice, unless the beneficiary shows that he or she did not receive the notice within the 5-day period; and
(3) The agency determines that the action resulted from other than the application of Federal or State law or policy.
(d) If a beneficiary's whereabouts are unknown, as indicated by the return of unforwardable agency mail directed to him, any discontinued services must be reinstated if his whereabouts become known during the time he is eligible for services.