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An

Specref
RefType(data type)
tSCTID
 is checked by using the Verhoeff check, which is a Dihedral D 5 Check. This detects a higher proportion of common typographical errors than either the IBM or Modulus 11 check. Unlike the Modulus 11 check it is effective on decimal strings longer than ten-digits. Furthermore its value can always be represented as a decimal digit without excluding any values.

Related Links

  • See  Check-Digit Computation for detailed information about the Verhoeff check-digit algorithm and links to sample program code.

  • See http://snomed.org/verhoeff for a sample web form that can be used to compute a check-digit or check the validity of an 
    Specref
    RefType(data type)
    tSCTID
    .