Collaborative Stage

Note 1: AJCC does not include a Tis category for gastrointestinal stromal tumors (GIST). Any case with a CS Extension code of 000 is mapped to TX for AJCC 7 stage and in situ Summary Stage.
Note 2: Ignore intraluminal extension to adjacent segment(s) of colon; code depth of invasion or extra-appendiceal spread as indicated.
Note 3: The assignment of T categories for gastrointestinal stromal tumors (GISTs) 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 170, 210, 250, and 270 as appropriate to code CS Extension based on a statement of T when no other extension information is available.
Note 4: Use code 150 only if GIST is described as arising in a polyp. Do not use this code for GIST described as arising in the wall of the appendix and extending into the lumen with a polypoid appearance.
Note 5: Use code 300 for localized cases only if no information is available to assign a more specific code.
Note 6: 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 adhesion(s) upon microscopic examination, use lower codes to describe the microscopically confirmed depth of tumor invasion for these cases (excluding adherence to liver, see Note 7).
Note 7: Adherence to the liver capsule is not considered distant metastasis. Use code 570 for any adherence to the liver capsule.

^ For CS Extension codes 100-800 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	TX	NA	IS	IS
050	OBSOLETE DATA RETAINED AND REVIEWED V0203 See code 000 (Adeno)carcinoma in a polyp or adenoma, noninvasive	TX	NA	IS	IS
100	OBSOLETE DATA RETAINED AND REVIEWED V0203 See codes 155 and 165 Invasive tumor confined to mucosa, NOS (including intramucosal, NOS)	^	NA	L	L
110	OBSOLETE DATA RETAINED AND REVIEWED V0203 See codes 155 and 165 Lamina propria, including lamina propria in the stalk of a polyp	^	NA	L	L
120	OBSOLETE DATA RETAINED AND REVIEWED V0203 See codes 155 and 165 Confined to and not through the muscularis mucosae, including muscularis mucosae in the stalk of a polyp	^	NA	L	L
130	OBSOLETE DATA RETAINED AND REVIEWED V0203 See codes 155 and 165 Confined to head of polyp, NOS	^	NA	L	L
140	OBSOLETE DATA RETAINED AND REVIEWED V0203 See codes 155 and 165 Confined to stalk of polyp, NOS	^	NA	L	L
150	Invasive tumor in polyp, NOS	^	NA	L	L
155	Tumor confined to muscular wall	^	NA	L	L
160	OBSOLETE DATA RETAINED AND REVIEWED V0203 See codes 155 and 165 Invades submucosa (superficial invasion), including submucosa in the stalk of a polyp	^	NA	L	L
165	Tumor invades through submucosa and muscularis mucosae to involve mucosa	^	NA	L	L
170	Stated as T1 with no other information on extension	^	NA	L	L
200	OBSOLETE DATA RETAINED AND REVIEWED V0203 See code 155 and 165 Muscularis propria invaded	^	NA	L	L
210	Stated as T2 with no other information on extension	^	NA	L	L
250	Stated as T3 with no other information on extension	^	NA	L	L
270	Stated as T4 with no other information on extension	^	NA	L	L
300	Confined to appendix, NOS Localized, NOS	^	NA	L	L
400	Extension through wall, NOS Invasion through muscularis propria or muscularis, NOS Non-peritonealized pericolic tissues invaded Perimuscular tissue invaded Subserosal tissue/(sub)serosal fat invaded Transmural, NOS Wall, NOS	^	NA	L	L
410	OBSOLETE DATA CONVERTED V0203 See code 250 Stated as T3, NOS	ERROR	ERROR	ERROR	ERROR
420	OBSOLETE DATA CONVERTED V0203 See code 458 Fat, NOS	ERROR	ERROR	ERROR	ERROR
450	Extension to: Adjacent tissue(s), NOS Connective tissue Mesenteric fat Mesentery Mesoappendix Pericolic fat	^	NA	RE	RE
458	Fat, NOS	^	NA	RE	RE
460	OBSOLETE DATA RETAINED AND REVIEWED V0203 See Note 6 and code 570 Adherent to other organs or structures, but no microscopic tumor found in adhesion(s)	^	NA	RE	RE
490	OBSOLETE DATA CONVERTED V0203 See code 270 Stated as T4, NOS	ERROR	ERROR	ERROR	ERROR
500	Invasion of/through serosa (mesothelium) (visceral peritoneum)	^	NA	RE	RE
550	500 + (420 and or 450)	^	NA	RE	RE
560	Invasion of/through serosa with invasion of/through mucosa	^	NA	RE	RE
570	Adherent to liver capsule Adherent to other organs or structures, NOS	^	NA	RE	RE
600	Greater omentum Small intestine	^	NA	RE	RE
650	Abdominal wall Retroperitoneum (excluding fat)	^	NA	RE	RE
660	OBSOLETE DATA RETAINED V0200 Ascending colon: Right kidney Right ureter Descending colon: Left kidney Left ureter	ERROR	NA	RE	RE
700	Fallopian tube Ovary Uterus	^	NA	D	D
750	Adrenal (suprarenal) gland Bladder Diaphragm Fistula to skin Gallbladder Other segment(s) of colon via serosa	^	NA	D	D
800	Other contiguous extension including: Kidney Liver Ureter	^	NA	D	D
950	No evidence of primary tumor	T0	NA	U	U
999	Unknown; extension not stated Primary tumor cannot be assessed Not documented in patient record	TX	NA	U	U

GISTAppendix

CS Extension