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What is a CIV number?

The CIV number is the last 3 or 4 digit number located on the signature panel or your physical card.

Memorial Sloan Kettering Cancer Center requires this number when making online payments in order to provide the highest level of security possible for our customers.

Please refer to the graphic below for a visual example:

CIV number illustration

American Express CIV Numbers are 4 digits, while Visa, Mastercard and Discover are 3 digits.