5 CFR 890.110: Enrollment reconciliation.

(a) Each employing office must report to each carrier or its surrogate on a quarterly basis the names of the individuals who are enrolled in the carrier's plan in a format and containing such information as required by OPM.

(b) The carrier must compare the data provided with its own enrollment records. When the carrier finds in its total enrollment records individuals whose names do not appear in the report from the employing office of record, the carrier must request the employing office to provide the documentation necessary to resolve the discrepancy.