| 11. | It is 7 characters in length and contains a check digit.
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| 12. | The check digit ( CD ) is not considered part of the MEID.
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| 13. | A ninth check digit was added to the end of the newer bank numbers.
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| 14. | The check digit is computed using a weighted sum of the first six characters.
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| 15. | The original value of the check digit is then compared with the calculated value.
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| 16. | The remainder of the numbers are the 10 NDC digits, plus the check digit.
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| 17. | The check digit is either a checksum or a cyclic redundancy check ( CRC ).
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| 18. | If the calculated value is 0 9, the check digit must match the calculated value.
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| 19. | The 12th digit of a UPC code is called a " modulo check digit ."
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| 20. | It has 9 significant digits and a check digit.
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