CS Extension

Notes

**Note 1**: Intraluminal or intramural extension to esophagus and duodenum is classified by the depth of greatest invasion in any of these sites, including stomach. (For extension to esophagus or duodenum via serosa, see code 610). **Note 2**: If the diagnosis states linitis plastica and no other information regarding extension is available, use code 350. Linitis plastica is defined as diffuse involvement of the entire thickness of the stomach wall. **Note 3**: Codes 610, 650, and 700 are for contiguous extension from the site of origin. Discontinuous involvement is coded in CS Mets at DX, except for implants within the stomach (code 300). Malignant (positive) peritoneal cytology is coded in CS Mets at DX.
Code Description AJCC 7 T AJCC 6 T Summary Stage 1977 T Summary Stage 2000 T
000 In situ, intraepithelial, noninvasive Tis Tis IS IS
050 (Adeno)carcinoma, noninvasive, in a polyp Tis Tis IS IS
100 Invasive tumor confined to mucosa, NOS, including intramucosal, NOS T1a T1 L L
110 Invades lamina propria T1a T1 L L
120 Invades muscularis mucosae T1a T1 L L
122 Mucosal tumor with intraluminal extension to esophagus or duodenum T1a T1 RE L
125 Stated as T1a with no other information on extension T1a T1 L L
130 Confined to head of polyp
Extension to stalk of polyp
T1NOS T1 L L
140 Confined to stalk of polyp T1NOS T1 L L
150 Tumor in polyp, NOS T1NOS T1 L L
160 Invades submucosa (superficial invasion) T1b T1 L L
165 Submucosal tumor with intraluminal extension to esophagus or duodenum T1b T1 RE L
170 Stated as T1b with no other information on extension T1b T1 L L
180 Stated as T1 [NOS] with no other information on extension T1NOS T1 L L
200 Invades into but not through muscularis propria T2 T2a L L
300 Implants inside stomach
Localized, NOS
T1NOS T1 L L
340 OBSOLETE DATA CONVERTED V0203
See code 180

Stated as T1, NOS
ERROR: ERROR: ERROR: ERROR:
350 Linitis plastica and no other information regarding extension available
(See Note 2)
T2 T2a RE L
360 Invasion of muscularis propria with intraluminal extension to esophagus or duodenum T2 T2a RE L
390 Stated as T2 with no other information on extension T2 T2NOS L L
400 Extension through wall, NOS
Invasion through muscularis propria or muscularis, NOS
Perimuscular tissue invaded
Subserosal tissue/(sub)serosal fat invaded
T3 T2b L L
415 Invasion through muscularis propria with intraluminal extension to esophagus or duodenum T3 T2b RE L
450 Extension to adjacent (connective) tissue
WITHOUT perforation of visceral peritoneum covering these structures:
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 T2b L L
490 OBSOLETE DATA CONVERTED V0203
See code 810

Stated as T4, NOS
ERROR: ERROR: ERROR: ERROR:
500 OBSOLETE DATA RETAINED AND REVIEWED V0203
See codes 505, 555

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
Stated as T4a, NOS
T4a T3 RE RE
505 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 listed in codes 610, 650, and 700
T4a T3 RE RE
550 OBSOLETE DATA CONVERTED V0203
See code 551

(450) + (500)
ERROR: ERROR: ERROR: ERROR:
551 505 + 450 T4a T3 RE RE
555 Stated as T4a with no other information on extension T4a 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
T4b T4 RE RE
610 Diaphragm
Duodenum via serosa
Duodenum, NOS
Esophagus via serosa
Ileum
Jejunum
Liver
Pancreas
Small intestine, NOS
Spleen
Transverse colon/mesocolon (including flexures)
T4b T4 RE RE
650 Aorta
Celiac axis
T4b T4 D D
690 OBSOLETE DATA CONVERTED V0203
See code 805

Stated as T4b, NOS
ERROR: ERROR: ERROR: ERROR:
700 Abdominal wall
Adrenal (suprarenal) gland
Kidney

Retroperitoneum
T4b T4 D D
800 Further contiguous extension T4b T4 D D
805 Stated as T4b with no other information on extension T4b T4 D D
810 Stated as T4 [NOS] with no other information on extension T4NOS T4 D D
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