5 CFR §890.1052

1. (a)Conviction reversed. The conviction on which the provider's debarment was based is reversed or vacated by a final decision of the highest appeals court with jurisdiction over the case; and the prosecutorial authority with jurisdiction over the case has declined to retry it, or the deadline for retrial has expired without action by the prosecutor.
2. (b)Sanction terminated. A sanction imposed by another Federal agency, on which the debarment was based, is terminated by that agency.
3. (c)Court order. A Federal court orders OPM to stay, rescind, or terminate a provider's debarment.
4. (d)Written notice. When reinstating a provider without an application, OPM shall send the provider written notice of the basis and effective date of his reinstatement.