CS Extension

Notes

**Note 1**: AJCC does not include a Tis category for Neuroendocrine Tumors (NET) of the small intestine. CS Extension code 000 is mapped to TX for AJCC stage and in situ for Summary Stage. **Note 2**: Ignore intraluminal or lateral extension to adjacent segment(s) of small intestine and code depth of invasion or spread outside the small intestine as indicated. **Note 3**: The nonperitonealized perimuscular tissue is, for jejunum and ileum, part of the mesentery and, for duodenum in areas where serosa is lacking, part of the retroperitoneum. **Note 4**: The assignment of the T1 category for neuroendocrine tumors (NET) of the small intestine 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, 210, 410, and 810 as appropriate to code CS Extension based on a statement of T when no other extension information is available. **Note 5**: Use code 300 for localized tumor only if no information is available to assign code 100, 110, 120. 160, 170, 200 or 210,
Code Description AJCC 7 T AJCC 6 T Summary Stage 1977 T Summary Stage 2000 T
000 In situ, intraepithelial, noninvasive TX Tis IS IS
050 OBSOLETE DATA RETAINED AND REVIEWED V0203
See code 000

(Adeno)carcinoma in a polyp, noninvasive
TX Tis IS IS
100 Invasive tumor confined to mucosa, NOS, including intramucosal, NOS Extension Size AJCC7 T1 L L
110 Invades lamina propria, including lamina propria in a polyp Extension Size AJCC7 T1 L L
120 Confined to and not through the muscularis mucosae, including muscularis mucosae in a polyp Extension Size AJCC7 T1 L L
130 OBSOLETE DATA RETAINED AND REVIEWED V0203
See codes 110, 120, 160

Confined to head of polyp
Extension Size AJCC7 T1 L L
140 OBSOLETE DATA RETAINED AND REVIEWED V0203
See codes 110, 120, 160

Confined to stalk of polyp
Extension Size AJCC7 T1 L L
150 OBSOLETE DATA RETAINED AND REVIEWED V0203
See codes 110, 120, 160

Invasion of polyp, NOS
Extension Size AJCC7 T1 L L
160 Invades submucosa (superficial invasion) including submucosa in a polyp Extension Size AJCC7 T1 L L
170 Stated as T1 with no other information on extension Extension Size AJCC7 T1 L L
200 Muscularis propria invaded T2 T2 L L
210 Stated as T2 with no other information on extension T2 T2 L L
300 Localized, NOS
Intraluminal spread to other segments of small intestine or cecum
Extension Size AJCC7 T1 L L
400 Invasion through muscularis propria or muscularis, NOS
Extension through wall, NOS
Subserosal tissue/(sub)serosal fat invaded
Transmural, NOS
T3 T3 L L
410 Stated as T3 with no other information on extension T3 T3 RE RE
420 OBSOLETE DATA CONVERTED V0203
See code 458

Fat, NOS
ERROR: ERROR: ERROR: ERROR:
450 OBSOLETE DATA RETAINED V0200
See codes 460-470 and 560

Adjacent connective tissue
Mesentery, including mesenteric fat, invaded less than or equal to 2 cm in depth or NOS
Nonperitonealized perimuscular tissue invaded less than or equal to 2 cm in depth or NOS
Retroperitoneum invaded less than or equal to 2 cm in depth or NOS
ERROR: T3 RE RE
458 Fat, NOS T3 T3 RE RE
460 OBSOLETE DATA REVIEWED V0203
See codes 465, 485

Adjacent connective tissue
Mesentery, including mesenteric fat
Perimuscular tissue
T3 T3 RE RE
465 Adjacent connective tissue
Mesentery, including mesenteric fat less than or equal to 2 centimeters (cm) in depth or NOS
Nonperitonealized perimuscular tissue less than or equal to 2 cm in depth or NOS
T3 T3 RE RE
470 OBSOLETE DATA REVIEWED V0203
See codes 475, 488

For duodenum primary only:
Retroperitoneum
T3 T3 RE RE
475 For duodenum primary only:
Retroperitoneum less than or equal to 2 cm in depth or NOS
T3 T3 RE RE
480 For duodenum primary only:
Ampulla of Vater
Pancreas
Pancreatic duct
T3 T3 RE RE
485 Mesentery invaded greater than 2 cm in depth
Nonperitonealized perimuscular tissue invaded greater than 2 cm in depth
T3 T4 RE RE
488 For duodenum primary only:
Retroperitoneum invaded greater than 2 cm in depth
T3 T4 RE RE
500 Invasion of/through serosa(mesothelium)(tunica serosa) (visceral peritoneum) T4 T4 L RE
550 OBSOLETE DATA RETAINED V0200

(500) + [(420) or (450)]
T4 T4 RE RE
560 OBSOLETE DATA CONVERTED V0203
See code 565

(500) + [(420) or (460) or (470) or (480)]
ERROR: ERROR: ERROR: ERROR:
565 500 + (458, 465, 475, 480, 485, or 488) T4 T4 RE RE
600 OBSOLETE DATA RETAINED V0200
See codes 480 and 610

For duodenum primary only:
Ampulla of Vater
Diaphragm
Extrahepatic bile ducts
Gallbladder
Pancreas
Pancreatic duct
ERROR: T4 RE RE
610 For duodenum primary only:
Diaphragm
Extrahepatic bile ducts
Gallbladder
T4 T4 RE RE
650 For duodenum primary only:
Blood vessel(s), major:
Aorta
Gastroduodenal artery
Portal vein
Renal vein
Superior mesenteric artery or vein
Vena cava
Greater omentum
Hepatic flexure
Kidney, NOS
Kidney, right
Liver, NOS
Liver, quadrate lobe
Liver, right lobe
Omentum, NOS
Transverse colon
Ureter, right
For jejunum or ileum primary only:
Colon, including appendix
T4 T4 RE RE
660 For duodenum primary only:
Stomach
T4 T4 RE RE
665 (610, 650, 660) + (485, 488) T4 T4 RE RE
670 OBSOLETE DATA RETAINED V0200

For all small intestine sites:
Abdominal wall
Mesentery invaded greater than 2 cm in depth
Non-peritonealized perimuscular tissue invaded
greater than 2 cm in depth
Retroperitoneum invaded greater than 2 cm in depth
T4 T4 RE RE
675 For all small intestine sites:
Abdominal wall
T4 T4 RE RE
678 For jejunum or ileum primary only:
Retroperitoneum invaded greater than 2cm in depth
T4 T4 RE RE
680 For all small intestine sites:
Other segments of the small intestine via serosa
T4 T4 RE RE
690 OBSOLETE DATA CONVERTED V0203
See code 810

Stated as T4[NOS] with no other information on extension
ERROR: ERROR: ERROR: ERROR:
700 For jejunum or ileum primary only:
Bladder
Fallopian tube
Ovary
Uterus
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
- For CS Extension codes 100-170, 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 A JCC 7 Table for this schema.