From the website:
The GW Benefits Call Center Get answers on your Health Welfare benefit plan, enrollment and eligibility questions. Phone 888-4GWUBEN 449-8236 Hours Monday - Friday , 9 a.m. - 6 p.m. EST GW Benefits Office Get support on all benefits programs offered to GW employees, Monday - Friday, 8 30 a.m. - 5 p.m. EST Via Email For Health Welfare Benefits questions