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• American Express
800-528-2122
800-992-3404 (to report a lost card)
americanexpress.com

• Citi Cards
800-950-5114
citicards.com

• Diners Club
800-234-6377
dinersclub.com

• Discover
800-DISCOVER
discovercard.com

• MasterCard
800-MCASSIST
mastercard.com

• Visa (to report a lost card)
800-336-8472
800-847-2911
visa.com