| Scenario | Correct Code in RED | Rationale |
| TURBT: Multiple in situ Tumors Bladder 1cm tumor bladder neck 1.5 cm tumor lateral wall of bladder | C672 Lateral Wall C675 Bladder Neck C678 Overlapping Lesion of Bladder C679 Bladder NOS | SEER Appendix C: Coding Guidelines-Bladder Assign site code C679 when there are multifocal tumors all of the same behavior in more than one subsite of the bladder and the specific subsite of origin is not known. |
| TURBT: Multiple Tumors invasive/insitu 1cm tumor bladder Neck noninvasive 1.5 cm tumor lateral wall of bladder-invasive | C672 Lateral Wall C675 Bladder Neck C678 Overlapping Lesion of Bladder C679 Bladder NOS | SEER Appendix C: Coding Guidelines-Bladder If the TURB or pathology proves invasive tumor in one subsite and in situ tumor in all other involved subsites, code to the subsite involved with invasive tumor. |
| 1 tumor overlaps 2 quadrants-subsite originated known 4 cm tumor in the right breast. The tumor originated in the upper inner quadrant and extends into the lower inner quadrant. | C502 Breast UIQ C503 Breast LIQ C508 Overlapping lesion of Breast C509 Breast Nos | SEER Program Coding and Staging Manual Coding Instructions for Solid Tumors. Code the site in which the primary tumor originated, even if it extends onto/into an adjacent subsite |
| 1 tumor overlaps 2 quadrants-subsite originated unknown 4 cm tumor in the right breast upper inner quadrant and extends into the lower inner quadrant. | C502 Breast UIQ C503 Breast LIQ C508 Overlapping lesion of Breast C509 Breast Nos | SEER Appendix C: Coding Guidelines-Breast Code the primary site to C508 when • There is a single tumor in two or more subsites and the subsite in which the tumor originated is unknown |
| 2 tumors Right Breast-2 quadrants 4cm tumor Right UIQ breast, 2 cm tumor Right LIQ breast | C502 Breast UIQ C503 Breast LIQ C508 Overlapping lesion of Breast C509 Breast Nos | SEER Appendix C: Coding Guidelines-Breast Code the primary site to C509 when • There are multiple tumors (two or more) in at least two quadrants of the breast |
| 2 tumors Right Breast-Same Quadrant 4cm tumor Right UIQ breast, 2 cm tumor Right UIQ breast | C502 Breast UIQ C508 Overlapping lesion of Breast C509 Breast Nos | SEER Appendix C: Coding Guidelines-Breast Code the specific quadrant for multifocal tumors all within one quadrant • Do not code C509 (Breast, NOS) in this situation |
| 2 tumors 12 o’clock breast | C502 Breast UIQ C508 Overlapping lesion of Breast C509 Breast Nos | SEER Appendix C: Coding Guidelines-Breast Code the primary site to C509 when There are multiple tumors (two or more) located together at the 12, 3, 6, or 9 o’clock position on the breast |
| 2cm tumor Uncinate of Pancreas | C250 Head of pancreas C251 Body of pancreas C252 Tail of pancreas C257 Other specified parts of pancreas; neck of pancreas C258 Overlapping lesion of pancreas C259 Pancreas, NOS | SEER Program Coding & Staging Manual Coding Instructions for Solid Tumors Refer to table-In the absence of any additional information about the primary site, assign the codes listed for these primary sites/histologies Uncinate of Pancreas Code C250 |
| | C020 Dorsal surface of tongue NOS C021 Border of tongue C022 Ventral surface of tongue NOS C023 Anterior 2/3 of tongue NOS C028 Overlapping lesion of tongue C029 Tongue NOS | SEER Program Coding & Staging Manual Coding Instructions for Solid Tumors Refer to table-In the absence of any additional information about the primary site, assign the codes listed for these primary sites/histologies Lateral Tongue Code C023 |
| Two tumors, LUL 1.2 cm, LLL 2.3 cm, being abstracted as a single primary | C340 Mainstem Bronchus C341 Upper Lobe Lung C342 Middle Lobe Lung C343 Lower Lobe Lung C348 Overlapping lesion of lung C349 Lung NOS | Solid Tumor Rules-Lung-Table 1 Coding Primary Site Lung NOS C349 Note: Includes • Multiple tumors in different lobes of ipsilateral lung • Multiple tumors in ipsilateral lung; unknown if same lobe or different lobe • Tumor in bronchus, unknown if mainstem or lobar bronchus • Tumor present, unknown which lobe • Multiple tumors abstracted as a single primary |
| 3.2 cm mass in right infrahilar region | C340 Mainstem Bronchus C341 Upper Lobe Lung C342 Middle Lobe Lung C343 Lower Lobe Lung C348 Overlapping lesion of lung C349 Lung NOS | Solid Tumor Rules-Lung-Table 1 Coding Primary Site Infrahilar NOS-Lung NOS C349 |
| Operative Text Left Partial Colectomy: Operative Findings- Circumferential mass at the splenic flexure. No obvious liver mets or peritoneal studding Path Text: Left Partial Colectomy,18 Regional nodes removed Tumor Site: Descending Colon Histology Adenocarcinoma Grade: G2 Moderately Differentiated | C18.6 Descending Colon C18.5 Splenic Flexure C18.9 Colon nos | SEER Appendix C Coding Guidelines -Colon Priority order for Coding Primary Site The Operative report with the surgeon’s description takes priority over the path report and imaging. |
