amex card number
For example, American Express card numbers start with 37; Carte Blanche and Diners Club with 38. 1  American Express - Digits three and four are type and currency, digits five through 11 are the account number, digits 12 through 14 are the card number within the account and digit 15 is a check digit.
American ExpressÂ®Card security features. 1. All American Express account numbers are embossed and start. with â37â or â34â. 2. Check account numbers are embossed (15 digits) with no alterations. 3. Check 4 digit Card Identification Number (CID) is hot stamped and. cannot be scratched off.