If the individual has no acceptable documents, write or telephone OPM. Provide the
individual's name and annuity claim identification number (a seven-digit number with
a “CSA” or “CSF” prefix). If the claim number is not available, provide the individual's
date of birth and Social Security number.
The OPM telephone number is (724) 794-2005 or, toll-free, (888) 767-6738. Send written
inquiries to:
Office of Personnel Management
Retirement Operations Center
P.O. Box 45
Boyers, PA 16017