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SEER Inquiry System - Report
Produced: 02/15/2026 4:14 AM
Question 20020059
Inquiry Details
References:
Question:
Grade, Differentiation: Can a FIGO grade be coded in this field or is the FIGO grading system to be used only for EOD/Stage coding?
Discussion:
Answer:
This answer pertains to cases prior to 2014. For cases diagnosed 2014 and forward, see http://seer.cancer.gov/tools/grade/
Do not use FIGO grade to code differentiation.
FIGO grade is something completely different from FIGO stage. FIGO stage is used to code EOD. FIGO grade is based on the percentage of non-squamous (i.e., solid) portions of the tumor and corresponds roughly to a three grade differentiation system: grade I, well differentiated (=<5% solid component); grade II, moderately differentiated (>5 - 50% solid); and grade III, poorly differentiated (> 50% solid). SEER is evaluating whether the ICD-O-3 6th digit differentiation codes (four grade categories) accurately represent the FIGO grade. For the time being, do not code FIGO grade.
For a diagnosis that includes commonly used differentiation term with a FIGO grade, such as "Moderately differentiated, FIGO grade II," disregard the FIGO grade and code the Grade, Differentiation field according to the term "Moderately differentiated."
