CFR > Title 5 - Administrative Personnel > CHAPTER I—OFFICE OF PERSONNEL MANAGEMENT > SUBCHAPTER B—CIVIL SERVICE REGULATIONS (parts 110 to 990) > PART 890—FEDERAL EMPLOYEES HEALTH BENEFITS PROGRAM > SUBPART F—Transfers From Retired Federal Employees Health Benefits Program (§890.601 to §890.605) > 890.602—Opportunity to change enrollment.