Data Last Updated: Feb. 14, 2019 (Version 1.5)
Notes**Note 1:** Clinical grade must not be blank. **Note 2:** Assign the highest grade from the primary tumor assessed during the clinical time frame. **Note 3:** Codes 1-3 take priority over A-D. **Note 4:** Code 9 when * Grade from primary site is not documented * Clinical workup is not done (for example, cancer is an incidental finding during surgery for another condition) * Grade checked "not applicable" on CAP Protocol (if available) and no other grade information is available **Note 5:** If there is only one grade available and it cannot be determined if it is clinical or pathological, assume it is a clinical grade and code appropriately per clinical grade categories for that site, and then code unknown (9) for pathological grade, and blank for post therapy grade.
|1||G1: Sum of differentiation score, mitotic count score and necrosis score equals 2 or 3|
|2||G2: Sum of differentiation score, mitotic count score and necrosis score of 4 or 5|
|3||G3: Sum of differentiation score, mitotic count score and necrosis score of 6, 7, or 8|
|9||Grade cannot be assessed (GX); Unknown|