20 C.F.R. § 222.21 When marriage is terminated by final divorce.
Title 20 - Employees' Benefits
A final divorce, often referred to as an absolute divorce, completely dissolves the marriage relationship and restores the parties to the status of single persons. A legal separation, qualified or preliminary divorce, divorce from bed and board, interlocutory decree of divorce, or similar court order is not considered a final divorce for family relationship and benefit entitlement purposes.
Title 20: Employees' Benefits
PART 222—FAMILY RELATIONSHIPS
Subpart C—Relationship as Divorced Spouse, Surviving Divorced Spouse, or Remarried Widow(er)
§ 222.21 When marriage is terminated by final divorce.

