Federal Employees' Compensation Act (FECA): Workers' Compensation for Federal Employees [Updated March 10, 2021] [open pdf - 1MB]
From the Summary: "The Federal Employees' Compensation Act (FECA) is the workers' compensation program for federal employees. Like all workers' compensation programs, FECA pays disability, survivors, and medical benefits, without regard to who was at fault, to employees who are injured or become ill in the course of their federal employment and to the survivors of employees killed on the job. The FECA program is administered by the Department of Labor (DOL) and the costs of benefits are paid by each employee's host agency. U.S. Postal Service (USPS) employees currently comprise the largest group of FECA beneficiaries and are responsible for the largest share of FECA benefits."
CRS Report for Congress, R42107
Congressional Research Service: https://crsreports.congress.gov/