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A five-character code allocated to a concept or term in CTV3. Note that codes allocated in Read Codes Version 2 and the Read Codes 4-Byte Set are also included in CTV3 . The original 4-byte codes are distinguished from 5-byte codes in the general representation by prefixing them with a full stop.


  • Read Codes 4-Byte Set
  • Read Codes Version 2