Collaborative Stage

Note 1: For this schema, AJCC defines Tis as carcinoma in situ/dysplasia (tumor size less than 0.5mm), confined to mucosa. Neuroendocrine tumors (NET) stated to be in situ, noninvasive, or confined to mucosa are classified as Tis. "Dysplasia" alone is generally not reportable in cancer registries but, if a registry does collect it, code 000 should be used.
Note 2: Intraluminal or intramural extension to esophagus and duodenum is classified by the depth of greatest invasion. For extension to esophagus or duodenum via serosa, see code 600.
Note 3 : The assignment of the T1 category for NETs of the stomach is based on tumor size. A physician's statement of the T category may be used to code both 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. Use codes 170, 390, 480, or 810 as appropriate to code CS Extension based on a statement of T when no other information is available.
Note 3: Use code 300 for localized tumor only if no information is available to assign code 100, 110, 120, 160. 170, 200, 390, or 400.

^ For CS Extension codes 110-170 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 AJCC 7 Table for this schema.

Code	Description	TNM 7 Map	TNM 6 Map	SS77 Map	SS2000 Map
000	In situ, intraepithelial, noninvasive Dysplasia Tumor size less than 0.5 millimeters (mm)	Tis	Tis	IS	IS
050	OBSOLETE DATA RETAINED AND REVIEWED V0203 See code 000 (Adeno)carcinoma in a polyp, noninvasive	Tis	Tis	IS	IS
100	Tumor confined to mucosa, NOS including intramucosal, NOS	Tis	T1	L	L
110	Invades lamina propria, including lamina propria in a polyp	^	T1	L	L
120	Invades muscularis mucosae, including muscularis mucosae in a polyp	^	T1	L	L
130	OBSOLETE DATA RETAINED AND REVIEWED V0203 See codes 110, 120, 160 Confined to head of polyp Extension to stalk	^	T1	L	L
140	OBSOLETE DATA RETAINED AND REVIEWED V0203 See codes 110, 120,160 Confined to stalk of polyp	^	T1	L	L
150	OBSOLETE DATA RETAINED AND REVIEWED V0203 See codes 110, 120, 160 Tumor in polyp, NOS	^	T1	L	L
160	Invades submucosa (superficial invasion), including submucosa in a polyp	^	T1	L	L
170	Stated as T1 with no other information on extension	^	T1	L	L
200	Invades into but not through muscularis propria	T2	T2a	L	L
300	Localized, NOS Implants inside stomach	^	T1	L	L
340	OBSOLETE DATA CONVERTED V0203 See code 170 Stated as T1, NOS with no other information on extension	ERROR	ERROR	ERROR	ERROR
350	OBSOLETE DATA RETAINED V0200 Linitis plastica (see Note 2) and no other information regarding extension is available.	ERROR	T2a	RE	L
390	Stated as T2 with no other information on extension	T2	T2NOS	L	L
400	Invasion through muscularis propria or muscularis, NOS Extension through wall, NOS Perimuscular tissue invaded Subserosa /(sub)serosal fat penetrated	T3	T2b	L	L
450	Extension to adjacent (connective) tissue WITHOUT perforation of visceral peritoneum: Gastric artery Ligaments: Gastrocolic Gastrohepatic Gastrosplenic Omentum, NOS: Greater Lesser Perigastric fat	T3	T2b	RE	RE
480	Stated as T3 with no other information on extension	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) (tunica serosa) (visceral peritoneum) Including perforation of visceral peritoneum covering the gastric ligaments or the omentum WITHOUT invasion of adjacent structures	T4	T3	RE	RE
550	500 + 450 Invasion of tissues in code 500 plus extension to structures in code 450	T4	T3	RE	RE
600	OBSOLETE DATA RETAINED AND REVIEWED V0203 See codes 610, 650 Diaphragm Duodenum via serosa or NOS Esophagus via serosa Ileum Jejunum Liver Pancreas Small intestine, NOS Spleen Transverse colon/mesocolon (including flexures) Celiac axis Aorta	T4	T4	RE	RE
610	Diaphragm Duodenum via serosa or NOS Esophagus via serosa Ileum Jejunum Liver Pancreas Small intestine, NOS Spleen Transverse colon/mesocolon (including flexures)	T4	T4	RE	RE
650	Aorta Celiac axis	T4	T4	D	D
700	Abdominal wall Adrenal gland Kidney Retroperitoneum	T4	T4	D	D
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

NETStomach

CS Extension