Grade
Grade is collected in 4 data items
| Data Item | Date Item # | Text Field # | Comments |
|---|---|---|---|
| Grade Clinical | 3843 | #2570: Text-Dx-Proc-Path | Information obtained from biopsy |
| Grade Pathological | 3844 | #2570: Text-Dx-Proc-Path | Information obtained from surgical resection |
| Grade Post Therapy Clinical | 1068 | #2570: Text-Dx-Proc-Path | Information obtained from a bx or FNA after neoadjuvant therapy but prior to post neoadjuvant surgical resection |
| Grade Post Therapy Pathological | 3845 | #2570: Text-Dx-Proc-Path | Information obtained from post neoadjuvant surgical resection |
See Schemas | SSDI Data | (naaccr.org)
(includes general instructions for Grade) or SEER*RSA (cancer.gov) for complete coding instructions for these data items.
The grading of lung tumors is based on a 4-grade Nuclear grading system.
Grade is to be coded from the original primary tumor. Do not use grade information from lymph nodes, metastatic tissue, or recurrences.
| Code | Grade Description |
|---|---|
| 1 | G1: Well differentiated |
| 2 | G2: Moderately differentiated |
| 3 | G3: Poorly differentiated |
| 4 | G4: Undifferentiated, anaplastic |
| 9 | Grade cannot be assessed (GX); Unknown |
For further information on coding grade for Lung, see the Grade Manual, Grade ID: 02
Grade manual can be found at Schemas | SSDI Data
Updated: April 8, 2026
Suggested Citation
SEER Training Modules: Grade. U.S. National Institutes of Health, National Cancer Institute. Cited 12 April 2026. Available from: https://training.seer.cancer.gov.