CS Extension

Notes

**Note 1**: Tumors of the head of the pancreas arise to the right of the superior mesenteric-portal vein confluence. **Note 2**: Islets of Langerhans are distributed throughout the pancreas; an islet tumor is coded to the subsite of the pancreas in which the tumor arises if the information is available. **Note 3**: The assignment of T1 and T2 categories for tumors of the pancreas is based on tumor size. A physician's statement of the T category may be used to code CS Tumor Size and/or CS Extension if this is the only information in the medical record regarding one or both of these fields. However the two fields are coded independently: for example the record may document size but not extension, other than the physician's statement of the T category. Use codes 150 and 200 as appropriate to code CS Extension based on a statement of T when no other extension information is available.

Code	Description	AJCC 7 T	AJCC 6 T	Summary Stage 1977 T	Summary Stage 2000 T
000	In situ, intraepithelial, noninvasive Pancreatic Intraepithelial Neoplasia III (PanInIII)	Tis	Tis	IS	IS
100	Confined to pancreas	Extension Size	Extension Size	L	L
150	Stated as T1 with no other information on extension	Extension Size	Extension Size	L	L
200	Stated as T2 with no other information on extension	Extension Size	Extension Size	L	L
300	Localized, NOS	Extension Size	Extension Size	L	L
400	Extension to peripancreatic tissue, NOS Fixation to adjacent structures, NOS	T3	T3	RE	RE
420	OBSOLETE DATA CONVERTED V0203 See code 595 Stated as T3, NOS	ERROR:	ERROR:	ERROR:	ERROR:
440	Ampulla of Vater Duodenum Extrahepatic bile duct(s)	T3	T3	RE	RE
500	Adjacent stomach Stomach, NOS	T3	T3	RE	RE
540	Blood vessel(s) (major): Gastroduodenal artery Hepatic artery Pancreaticoduodenal artery Portal vein Superior mesenteric vein Transverse colon, including hepatic flexure	T3	T3	RE	RE
550	Mesenteric fat Mesentery Mesocolon Peritoneum	T3	T3	RE	D
570	Gallbladder	T3	T3	RE	D
575	Omentum	T3	T3	RE	D
580	Body of stomach	T3	T3	D	RE
590	580 + (550 and/or 570) Body of stomach plus any structures in 550 and/or 570	T3	T3	D	D
593	580 + 575 Body of stomach plus omentum	T3	T3	RE	D
595	Stated as T3 with no other information on extension	T3	T3	RE	RE
600	Tumor is inseparable from the superior mesenteric artery Superior mesenteric artery	T4	T4	RE	RE
610	OBSOLETE DATA RETAINED AND REVIEWED V0203 See codes 575, 593, 640 Omentum	T4	T4	RE	D
630	Liver (including porta hepatis)	T4	T4	RE	D
640	600 + 575 Superior mesenteric artery plus omentum	T4	T4	RE	D
650	600 + (550 and/or 570) Superior mesenteric artery plus any structure in code 550 and/or 570	T4	T4	RE	D
660	600 + 580 Superior mesenteric artery plus body of stomach	T4	T4	D	RE
670	(550, 570, 610, and/or 630) + 600 + 580 Any structure in codes 550, 570, 610, and/or 630 plus superior mesenteric artery plus body of stomach OR (550, 570, 610, and/or 630) + 580 Any structure in codes 550, 570, 670, and/or 630 plus body of stomach	T4	T4	D	D
680	Tumor is inseparable from the celiac axis Aorta Celiac artery	T4	T4	D	D
690	Colon (other than transverse colon including hepatic flexure) Spleen	T4	T4	D	D
780	Adrenal (suprarenal) gland Ileum Jejunum Kidney Retroperitoneum Ureter	T4	T4	D	D
790	OBSOLETE DATA CONVERTED V0203 See code 810 Stated as T4, NOS	ERROR:	ERROR:	ERROR:	ERROR:
800	Further contiguous extension	T4	T4	D	D
810	Stated as T4 with no other information on extension	T4	T4	RE	RE
950	No evidence of primary tumor	T0	T0	U	U
999	Unknown; extension not stated Primary tumor cannot be assessed Not documented in patient record	TX	TX	U	U

- For CS Extension codes 100, 150, 200, and 300 ONLY, the T category for AJCC 7 staging is assigned based on the value of CS Tumor Size, as shown in the Extension Size Table for this schema. - For CS Extension codes 100, 150, 200, and 300 ONLY, the T category for AJCC 6 staging is assigned based on the value of CS Tumor Size, as shown in the Extension Size Table for this schema.