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  • Only positive integer values that are greater than 105 and less than 1018 are permitted.
  • The only valid string renderings of the identifier value are String

    Specref
    RefType(data type)
    tString
    of decimal digits (0-9), commencing with a non zero digit.

  • The second and third digits from the right hand end of the string rendering of the identifier must match one of the

    Gloss
    tpartition-identifier values specified in this guide.

  • The rightmost digit of the string rendering is a

    Gloss
    Spacetrue
    tcheck-digit
    and must match the value calculated using the specified
    Gloss
    tcheck-digit computation.

Info
  • As a result of these rules, many 64-bit integers are not valid

    Gloss
    Spacetrue
    tSCTIDs.
    The value limitations enable any valid
    Gloss
    Spacetrue
    tSCTID
    to be stored in either a signed or unsigned 64-bit integer.

  • The rules also ensure that an  SCTID

    Specref
    RefType(data type)
    tSCTID
     can be distinguished from code from one of the antecedent code systems
    Gloss
    tRead Codes
    (which are 4 or 5 characters in length) and legacy
    Gloss
    Spacetrue
    tIdentifiers
    from
    Gloss
    Spacetrue
    tSNOMED RT
    and it predecessors (which always start with a letter).

  • Gloss
    Spacetrue
    tSNOMED RT
    identifiers are
    Gloss
    Spacetrue
    tSCTIDs
    identical to those used in
    Gloss
    Spacetrue
    tSNOMED CT
    but in some cases will now refer to
    Gloss
    Spacetrue
    tinactive concepts.
    In these cases, data in the
    Concept
    t900000000000489007|Concept inactivation indicator reference set|
    ShowFormatinline
    and
    Concept
    t900000000000522004|Historical association reference set|
    ShowFormatinline
    can be used to find the identifier of the closest equivalent
    Gloss
    tactive concept.