- C.M.S. - Guidance relating to Medicare Prescription Drug Benefit Creditable-Coverage-Requirements for employer and union-sponsored plans
- Centers for Disease Control and Prevention (CDC)
- Health.gov
- National Institutes of Health
- Internal Revenue Service
- The Official U.S. Government Site for People with MedicareUSA.Gov - The US Government's Official Web Portal
- US Department of Health & Human Services
- US Department of Labor
- US Department of Labor- Occupational Safety & Health Administration