Code for the behavior of the tumor being reported using ICD-O-2. NAACCR adopted ICD-O-2 as the standard coding system for tumors diagnosed from January 1, 1992, through December 31, 2000. In addition, NAACCR recommended that cases diagnosed prior to 1992 be converted to ICD-O-2. See Behavior (73-91) ICD-O-1 [1972], for ICD-O-1 and field trial codes.
Valid codes are 0-3. See ICD-O-2,15 page 22, for behavior codes and definitions.