LOINC description : Area for retaining the grade portion (1 digit) of the ICD-O-1 or field trial grade
code entered before a conversion to ICD-O-2. See grouped data item Morph (73-91) ICD-O-1
[1970] in Appendix E. The item name includes years 1973-91. However, some states may
have used the codes for cases before 1973..... NAACCR Data Standards and Data Dictionary
Version 11;