LOINC description : Code for the primary site of the tumor being reported using either ICD-O-2 or ICD-O-3.
NAACCR adopted ICD-O-2 as the standard coding system for tumors diagnosed beginning
January 1, 1992. In addition, NAACCR recommended that tumors diagnosed prior to 1992
be converted to ICD-O-2. The topography (primary site) codes have not changed between
ICD-O-2 and ICD-O-3... NAACCR Data Standards and Data Dictionary Version 11;