CS Extension
Notes
**Note 1**: AJCC does not include a Tis category for Neuroendocrine Tumors (NET) of the colon. CS Extension code 000 is mapped to TX for AJCC stage and in situ Summary Stage. **Note 2**: Ignore intraluminal extension to adjacent segment(s) of colon/rectum or to the ileum from the cecum; code depth of invasion or extracolonic spread as indicated. **Note 3**: The assignment of the T1 categories for NETs of the colon/rectum 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, 180, 190, 210, 410, and 810 as appropriate to code CS Extension based on a statement of T when no other extension information is available. **Note 4**: Use code 300 for localized tumor only if no information is available to assign a more specific code. **Note 5**: 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 adhesions upon microscopic examination, use lower codes to describe the microscopically confirmed depth of tumor invasion for these cases.| 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 or adenoma, noninvasive |
TX | Tis | IS | IS |
| 100 | Invasive tumor confined to mucosa, NOS including intramucosal, NOS | Extension Size AJCC7 | Tis | L | L |
| 110 | Invades lamina propria, including lamina propria in the stalk of a polyp | Extension Size AJCC7 | Tis | L | L |
| 120 | Confined to and not through the muscularis mucosae, including muscularis mucosae in the stalk of a polyp. | Extension Size AJCC7 | Tis | L | L |
| 130 | OBSOLETE DATA RETAINED AND REVIEWED V0203 See codes 110, 120, 160 Confined to head of polyp, NOS |
Extension Size AJCC7 | T1 | L | L |
| 140 | OBSOLETE DATA RETAINED AND REVIEWED V0203 See codes 110, 120, 160 Confined to stalk of polyp, NOS |
Extension Size AJCC7 | T1 | L | L |
| 150 | OBSOLETE DATA RETAINED AND REVIEWED V0203 See codes 110, 120, 160 Invasive tumor in polyp, NOS |
Extension Size AJCC7 | T1 | L | L |
| 160 | Invades submucosa (superficial invasion), including submucosa in the stalk of a polyp | Extension Size AJCC7 | T1 | L | L |
| 170 | Stated as T1a with no other information on extension | Extension Size AJCC7 | T1 | L | L |
| 180 | Stated as T1b with no other information on extension | Extension Size AJCC7 | T1 | L | L |
| 190 | Stated as T1 [NOS] 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 Confined to colon, NOS |
Extension Size AJCC7 | T1 | L | L |
| 400 | Extension through wall, NOS Through muscularis propria or muscularis, NOS Non-peritonealized pericolic tissues invaded Perimuscular tissue invaded Subserosal tissue/(sub)serosal fat invaded Transmural, NOS |
T3 | T3 | L | L |
| 410 | Stated as T3 with no other information on extension | T3 | T3 | L | L |
| 420 | OBSOLETE DATA CONVERTED V0203 See code 458 Fat, NOS |
ERROR: | ERROR: | ERROR: | ERROR: |
| 450 | Extension to: All colon sites: Adjacent tissue(s), NOS Connective tissue Mesenteric fat Mesentery Mesocolon Pericolic fat Ascending and descending colon: Retroperitoneal fat Transverse colon/flexures: Gastrocolic ligament Greater omentum |
T3 | T3 | RE | RE |
| 458 | Fat, NOS | T3 | T3 | RE | RE |
| 460 | OBSOLETE DATA RETAINED AND REVIEWED V0203 See Note 5, code 570 Adherent to other organs or structures, but no microscopic tumor found in adhesion(s) |
T3 | T3 | RE | RE |
| 490 | OBSOLETE DATA CONVERTED V0203 See code 810 Stated as T4, NOS with no other information on extension |
ERROR: | ERROR: | ERROR: | ERROR: |
| 500 | Invasion of/through serosa (mesothelium) (visceral peritoneum) | T4 | T4 | RE | RE |
| 550 | 500 + (450, 458) Invasion of/through serosa with extension to tissues listed in code 450 or to fat |
T4 | T4 | RE | RE |
| 570 | Adherent to other organs or structures, NOS | T4 | T4 | RE | RE |
| 600 | All colon sites: Small intestine Cecum: Greater omentum Ascending colon: Greater omentum Liver, right lobe Transverse colon and flexures: Gallbladder/bile ducts Kidney Liver Pancreas Spleen Stomach Descending colon: Greater omentum Pelvic wall Spleen Sigmoid colon: Greater omentum Pelvic wall |
T4 | T4 | RE | RE |
| 650 | All colon sites: Abdominal wall Retroperitoneum (excluding fat) |
T4 | T4 | RE | RE |
| 660 | Ascending colon: Right kidney Right ureter Descending colon: Left kidney Left ureter |
T4 | T4 | RE | RE |
| 700 | Cecum, ascending, descending and sigmoid colon: Fallopian tube Ovary Uterus |
T4 | T4 | D | D |
| 750 | All colon sites unless otherwise stated above: Adrenal (suprarenal) gland Bladder Diaphragm Fistula to skin Gallbladder Other segment(s) of colon via serosa |
T4 | T4 | D | D |
| 800 | Further contiguous extension: Cecum: Kidney Liver Ureter Transverse colon and flexures: Ureter Sigmoid colon: Cul de sac (rectouterine pouch) Ureter Other 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 |