The permissible value for the SCTIDsare limited by the following rules:
- Only positive integer values that are greater than 105 and less than 1018 are permitted.
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The only valid string renderings of the identifier value are String (data type) of decimal digits (0-9), commencing with a non zero digit.
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The second and third digits from the right hand end of the string rendering of the identifier must match one of the partition-identifier values specified in this guide.
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The rightmost digit of the string rendering is a check-digitand must match the value calculated using the specified check-digit computation.
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As a result of these rules, many 64-bit integers are not valid SCTIDs.The value limitations enable any valid SCTIDto be stored in either a signed or unsigned 64-bit integer.
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The rules also ensure that an SCTID (data type) can be distinguished from code from one of the antecedent code systems Read Codes(which are 4 or 5 characters in length) and legacy Identifiersfrom SNOMED RTand it predecessors (which always start with a letter).
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SNOMED RTidentifiers are SCTIDsidentical to those used in SNOMED CTbut in some cases will now refer to inactive concepts.In these cases, data in the 900000000000489007 | Concept inactivation indicator reference set| and 900000000000522004 | Historical association reference set| can be used to find the identifier of the closest equivalent active concept.
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