Code specifying how the conversion of site and morphology codes from ICD-O-2 to ICD-O-3 was accomplished.

0	Morphology (Morph--Type&Behav ICD-O-3 [521]) originally coded in ICD-O-3
1	Morphology (Morph--Type&Behav ICD-O-3 [521]) converted from (Morph--Type&Behav ICD-O-2 [419]) without review
3	Morphology (Morph--Type&Behav ICD-O-3 [521]) converted from (Morph--Type&Behav ICD-O-2 [419]) with review
Blank	Not converted (clarification for cases diagnosed as of January 1, 2007: cases coded in prior ICD-O version and not converted to ICD-O-3)