Aetna (PayFlex is an Aetna company):

PayFlex Systems USA, Inc.
P.O. Box 14879
Lexington, KY 40512-4879

Fax: (888) 238-3539

Phone: (800) 468-1266

Cigna:

Cigna
P.O. Box 182223
Chattanooga, TN 37422-7223

Customer Service: (800) 790-3086