Alternate Name Item# Length Source of Standard Column #
1971 4 SEER 1913-1916

Description
Area for retaining the histology portion (4 digits) of the ICD-O-1 or field trial morphology codes 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.

Codes
For cases diagnosed before 1992, contains the ICD-O-1 or field trial 4-digit histology code as originally coded, if available. Blank for tumors coded directly into ICD-O-2 or ICD-O-3 (i.e., 1992 and later cases).