Collaborative Stage

Note 2: AJCC does not include a Tis category for Neuroendocrine Tumors (NET) of the colon. CS Extension code 000 is mapped to TX for AJCC stage and in situ Summary Stage.
Note 1: Ignore intraluminal extension to adjacent segment(s) of colon/rectum or to the ileum from the cecum; code depth of invasion or extracolonic spread as indicated.
Note 3: The assignment of the T1 categories for NETs of the colon/rectum is based on tumor size. A physician's statement of the T category may be used to code both CSTumor 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,. Use codes 170, 180, 190, 210, 410, and 810 as appropriate to code CS Extension based on a statement of T when no other extension information is available.
Note 4: Use code 300 for localized tumor only if no information is available to assign a more specific code.
Note 5: Use code 570 for tumor with macroscopic adhesions to other organs or structures and for pathologically confirmed tumor in adhesions. However, if no tumor is present in adhesions upon microscopic examination, use lower codes to describe the microscopically confirmed depth of tumor invasion for these cases.

^ For CSExtension codes 100-190 and 300 ONLY, the T category for AJCC7 staging is assigned based on the value of CS Tumor Size, as shown in the Extension Size AJCC 7 Table for this schema.

Code	Description	TNM 7 Map	TNM 6 Map	SS77 Map	SS2000 Map
000	In situ, intraepithelial, noninvasive	TX	Tis	IS	IS
050	OBSOLETE DATA RETAINED AND REVIEWED V0203 See code 000 (Adeno)carcinoma in a polyp or adenoma, noninvasive	TX	Tis	IS	IS
100	Invasive tumor confined to mucosa, NOS including intramucosal, NOS	^	Tis	L	L
110	Invades lamina propria, including lamina propria in the stalk of a polyp	^	Tis	L	L
120	Confined to and not through the muscularis mucosae, including muscularis mucosae in the stalk of a polyp.	^	Tis	L	L
130	OBSOLETE DATA RETAINED AND REVIEWED V0203 See codes 110, 120, 160 Confined to head of polyp, NOS	^	T1	L	L
140	OBSOLETE DATA RETAINED AND REVIEWED V0203 See codes 110, 120, 160 Confined to stalk of polyp, NOS	^	T1	L	L
150	OBSOLETE DATA RETAINED AND REVIEWED V0203 See codes 110, 120, 160 Invasive tumor in polyp, NOS	^	T1	L	L
160	Invades submucosa (superficial invasion), including submucosa in the stalk of a polyp	^	T1	L	L
170	Stated as T1a with no other information on extension	^	T1	L	L
180	Stated as T1b with no other information on extension	^	T1	L	L
190	Stated as T1 [NOS] with no other information on extension	^	T1	L	L
200	Muscularis propria invaded	T2	T2	L	L
210	Stated as T2 with no other information on extension	T2	T2	L	L
300	Localized, NOS Confined to colon, NOS	^	T1	L	L
400	Extension through wall, NOS Through muscularis propria or muscularis, NOS Non-peritonealized pericolic tissues invaded Perimuscular tissue invaded Subserosal tissue/(sub)serosal fat invaded Transmural, NOS	T3	T3	L	L
410	Stated as T3 with no other information on extension	T3	T3	L	L
420	OBSOLETE DATA CONVERTED V0203 See code 458 Fat, NOS	ERROR	ERROR	ERROR	ERROR
450	Extension to: All colon sites: Adjacent tissue(s), NOS Connective tissue Mesenteric fat Mesentery Mesocolon Pericolic fat Ascending and descending colon: Retroperitoneal fat Transverse colon/flexures: Gastrocolic ligament Greater omentum	T3	T3	RE	RE
458	Fat, NOS	T3	T3	RE	RE
460	OBSOLETE DATA RETAINED AND REVIEWED V0203 See Note 5, code 570 Adherent to other organs or structures, but no microscopic tumor found in adhesion(s)	T3	T3	RE	RE
490	OBSOLETE DATA CONVERTED V0203 See code 810 Stated as T4, NOS with no other information on extension	ERROR	ERROR	ERROR	ERROR
500	Invasion of/through serosa (mesothelium) (visceral peritoneum)	T4	T4	RE	RE
550	500 + (450, 458) Invasion of/through serosa with extension to tissues listed in code 450 or to fat	T4	T4	RE	RE
570	Adherent to other organs or structures, NOS	T4	T4	RE	RE
600	All colon sites: Small intestine Cecum: Greater omentum Ascending colon: Greater omentum Liver, right lobe Transverse colon and flexures: Gallbladder/bile ducts Kidney Liver Pancreas Spleen Stomach Descending colon: Greater omentum Pelvic wall Spleen Sigmoid colon: Greater omentum Pelvic wall	T4	T4	RE	RE
650	All colon sites: Abdominal wall Retroperitoneum (excluding fat)	T4	T4	RE	RE
660	Ascending colon: Right kidney Right ureter Descending colon: Left kidney Left ureter	T4	T4	RE	RE
700	Cecum, ascending, descending and sigmoid colon: Fallopian tube Ovary Uterus	T4	T4	D	D
750	All colon sites unless otherwise stated above: Adrenal (suprarenal) gland Bladder Diaphragm Fistula to skin Gallbladder Other segment(s) of colon via serosa	T4	T4	D	D
800	Further contiguous extension: Cecum: Kidney Liver Ureter Transverse colon and flexures: Ureter Sigmoid colon: Cul de sac (rectouterine pouch) Ureter Other 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

NETColon

CS Extension