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 |