Coding CS Site-Specific Factors
Important
These modules are archived and should only be referenced for historical purposes.
These six data fields identify prognostic factors that have an effect on stage. They are:
- CS Site-Specific Factor 1
- CS Site-Specific Factor 2
- CS Site-Specific Factor 3
- CS Site-Specific Factor 4
- CS Site-Specific Factor 5
- CS Site-Specific Factor 6
| Code | Description |
|---|---|
| 000 | None |
| Code | Description |
|---|---|
| 999 | Unknown; [site-specific title] cannot be assessed; Not documented in patient record. |
For schemes which do not use this site-specific factor:
| Code | Description |
|---|---|
| 888 | Not applicable for this site. |
Site-specific factors replace existing "tumor marker" fields and are necessary for AJCC TNM (6th Ed.) They are only used for certain sites, for instance breast to record Estrogen Receptor Assay (ERA) and Progesterone Receptor Assay (PRA).
Instructions for Coding
- If there is no site-specific factor for a scheme, code 888.
- Refer to the list of primary sites that use each site-specific factor, 1 through 6, to code information. See the site-specific scheme for acceptable codes and their definitions.
Click here to see the Site-Specific Factors Used For Primary Site/Histology Schemes.
Suggested Citation
SEER Training Modules: Coding CS Site-Specific Factors. U.S. National Institutes of Health, National Cancer Institute. Cited 19 December 2025. Available from: https://training.seer.cancer.gov.