5 C.F.R. § 838.505 Barring payment of refunds.
Title 5 - Administrative Personnel
A court order barring payment of a refund of employee contributions is not a court order acceptable for processing unless— (a) It expressly directs OPM not to pay a refund of employee contributions; (b) It awards, or a prior court order acceptable for processing has awarded, the former spouse a former spouse survivor annuity or a portion of the employee annuity; and (c) Payment of the refund of employee contributions would prevent payment to the former spouse under the court order described in paragraph (b) of this section.
Title 5: Administrative Personnel
PART 838—COURT ORDERS AFFECTING RETIREMENT BENEFITS
Subpart E—Requirements for Court Orders Affecting Refunds of Employee Contributions
§ 838.505 Barring payment of refunds.