Annuitants in retirement systems other than the Civil Service Retirement System (CSRS) or Federal Employees Retirement System (FERS), including individuals receiving monthly compensation from the Office of Workers' Compensation Programs (OWCP).Note: CSRS and FERS annuitants and former spouses and children of CSRS/FERS annuitants - do not use this form. Instead, use OPM 2809, Health Benefits Registration Form (only for use by Annuitants and Former Spouses of Annuitants), which is available at www.opm.gov/retire, or call the Retirement Information Office toll free at 1-888-767-6738.