The Federal Employees Health Benefits (FEHB) Program is a system of “managed competition” through which employee health benefits are provided to civilian government employees and annuitants of the United States government. The government contributes 72% of the weighted average premium of all plans, not to exceed 75% of the premium for any one plan (calculated separately for individual and family coverage).[1]
The FEHB program allows some insurance companies, employee associations, and labor unions to market health insurance plans to governmental employees. The program is administered by the United States Office of Personnel Management (OPM).
Further reading
https://en.wikipedia.org/wiki/Federal_Employees_Health_Benefits_Program