02-14-2025 Bladder Bits
Utilize the resources below, they list several descriptions of places in the bladder & how to code them, which go way beyond the click & pick definitions in your registry software.
Solid Tumor Rules 2025 Update Urinary
- Instructions for Coding Primary Site
- Table 1: ICD-O Primary Site Codes
SEER Appendix C Coding Guidelines for more tips on abstracting Bladder Cases.

Match the Description to the Code
- A single tumor of any histology overlaps subsites of the bladder
- A single tumor or non-contiguous tumors which are:
- Urothelial carcinoma in situ 8120/2 AND
- Involves only bladder and one or both ureters (no other urinary sites involved)
- Multiple non-contiguous tumors within the bladder AND the subsite/origin is unknown/not documented.
- Left Wall of the Bladder
- Lateral to ureteral orifice
- Just above the ureteric orifice
1.A single tumor of any histology overlaps subsites of the bladder | C678 Overlapping lesion of bladder |
2. A single tumor or non-contiguous tumor which are: * Urothelial carcinoma in situ 8120/2 AND * Involves only bladder and one or both ureters (no other urinary sites involved) | C678 Overlapping lesion of bladder |
3.Multiple non-contiguous tumors within the bladder AND the subsite/origin is unknown/not documented. | C679 Bladder, NOS |
4. Left Wall of the Bladder | C672 Lateral wall of bladder |
5. Lateral to ureteral orifice | C672 Lateral wall of bladder |
6.Just above the ureteric orifice | C676 Ureteric orifice |