CS Extension
Notes
**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**: Intraluminal or intramural extension to esophagus and duodenum is classified by the depth of greatest invasion in any of these sites, including stomach. **Note 3**: The assignment of T categories for 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 340, 390, 395, and 398 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.| Code | Description | AJCC 7 T | AJCC 6 T | Summary Stage 1977 T | Summary Stage 2000 T |
|---|---|---|---|---|---|
| 000 | In situ, intraepithelial, noninvasive | TX | NA | IS | IS |
| 050 | OBSOLETE DATA RETAINED AND REVIEWED V0203 See code 000 (Adeno)carcinoma, noninvasive, in a polyp |
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) |
Extension Size AJCC7 | NA | L | L |
| 110 | OBSOLETE DATA RETAINED AND REVIEWED V0203 See codes 155 and 165 Invades lamina propria |
Extension Size AJCC7 | NA | L | L |
| 120 | OBSOLETE DATA RETAINED AND REVIEWED V0203 See codes 155 and 165 Invades muscularis mucosae |
Extension Size AJCC7 | NA | L | L |
| 130 | OBSOLETE DATA RETAINED AND REVIEWED V0203 See codes 155 and 165 Confined to head of polyp Extension to stalk of polyp |
Extension Size AJCC7 | NA | L | L |
| 140 | OBSOLETE DATA RETAINED AND REVIEWED V0203 See codes 155 and 165 Confined to stalk of polyp |
Extension Size AJCC7 | NA | L | L |
| 150 | Invasive tumor in polyp, NOS | Extension Size AJCC7 | NA | L | L |
| 155 | Tumor confined to muscular wall | Extension Size AJCC7 | NA | L | L |
| 160 | OBSOLETE DATA RETAINED AND REVIEWED V0203 See codes 155 and 165 Invades submucosa (superficial invasion) |
Extension Size AJCC7 | NA | L | L |
| 165 | Tumor invades through submucosa and muscularis mucosae to involve mucosa | Extension Size AJCC7 | NA | L | L |
| 200 | OBSOLETE DATA RETAINED AND REVIEWED V0203 See codes 155 and 165 Invades into but not through muscularis propria |
Extension Size AJCC7 | NA | L | L |
| 300 | Implants inside stomach Localized, NOS |
Extension Size AJCC7 | NA | L | L |
| 340 | Stated as T1 with no other information on extension | Extension Size AJCC7 | NA | L | L |
| 350 | OBSOLETE DATA RETAINED V0200 Linitis plastica and no other information regarding extension is available |
ERROR: | NA | RE | L |
| 390 | Stated as T2 with no other information on extension | Extension Size AJCC7 | NA | L | L |
| 395 | Stated as T3 with no other information on extension | Extension Size AJCC7 | NA | L | L |
| 398 | Stated as T4 with no other information on extension | Extension Size AJCC7 | NA | L | L |
| 400 | Invasion through muscularis propria or muscularis, NOS Extension through wall, NOS Perimuscular tissue invaded Subserosal tissue/(sub)serosal fat invaded Note: In V0203 ONLY, code 400 had a different meaning, but the original description of the code has been restored in V0204. |
Extension Size AJCC7 | NA | L | L |
| 440 | Intraluminal extension to esophagus or duodenum | Extension Size AJCC7 | NA | RE | L |
| 450 | Extension to adjacent (connective) tissue WITHOUT perforation of visceral peritoneum: Gastric artery Ligaments: Gastrocolic Gastrohepatic Gastrosplenic Omentum, NOS: Greater Lesser Perigastric fat |
Extension Size AJCC7 | NA | RE | RE |
| 458 | Fat, NOS | Extension Size AJCC7 | NA | RE | RE |
| 480 | OBSOLETE DATA CONVERTED V0203 See code 395 Stated as T3 with no other information on extension |
ERROR: | ERROR: | ERROR: | ERROR: |
| 490 | OBSOLETE DATA CONVERTED V0203 See code 398 Stated as T4 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 |
Extension Size AJCC7 | NA | RE | RE |
| 550 | 500 + 450 | Extension Size AJCC7 | NA | RE | RE |
| 560 | Invasion of/through serosa with invasion of/through mucosa | Extension Size AJCC7 | NA | RE | RE |
| 600 | OBSOLETE DATA RETAINED AND REVIEWED V0203 See codes 610 and 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 |
Extension Size AJCC7 | NA | 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) |
Extension Size AJCC7 | NA | RE | RE |
| 650 | Aorta Celiac axis |
Extension Size AJCC7 | NA | D | D |
| 700 | Abdominal wall Adrenal gland Kidney Retroperitoneum |
Extension Size AJCC7 | NA | D | D |
| 800 | Further contiguous extension | Extension Size AJCC7 | 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 |