CS Extension

Notes

**Note 1**: Islets of Langerhans are distributed throughout the pancreas; an islet tumor is coded to the subsite of the pancreas in which the tumor arises if the information is available. **Note 2**: Codes 400-780 are used for contiguous extension of tumor from the site of origin. Discontinuous involvement is coded in CS Mets at DX. **Note 3**: The assignment of T1 and T2 categories for tumors of the pancreas 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 150 and 200 as appropriate to code CS Extension based on a statement of T when no other extension information is available.
Code Description AJCC 7 T AJCC 6 T Summary Stage 1977 T Summary Stage 2000 T
000 In situ, intrapethelial, noninvasive
Pancreatic intraepithelial neoplasia III (PanInIII)
Tis Tis IS IS
100 Confined to pancreas Extension Size Extension Size L L
150 Stated as T1 with no other information on extension Extension Size Extension Size L L
200 Stated as T2 with no other information on extension Extension Size Extension Size L L
300 Localized, NOS Extension Size Extension Size L L
400 Peripancreatic tissue T3 T3 RE RE
420 OBSOLETE DATA CONVERTED V0203
See code 510

Stated as T3, NOS
ERROR: ERROR: ERROR: ERROR:
450 Ampulla of Vater
Duodenum
Extra hepatic bile duct(s)
T3 T3 RE RE
500 Adjacent large vessel(s) (except as listed in code 600)
Colon
Spleen
Stomach
T3 T3 RE RE
510 Stated as T3 with no other information on extension T3 T3 RE RE
600 Tumor is inseparable from the celiac axis or superior mesenteric artery
Aorta
Celiac artery
Superior mesenteric artery
T4 T4 RE RE
790 OBSOLETE DATA CONVERTED V0203
See code 810

Stated as T4, NOS
ERROR: ERROR: ERROR: ERROR:
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, 150, 200, 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 Table for this schema. - For CS Extension codes 100, 150, 200, and 300 ONLY, the T category for AJCC 6 staging is assigned based on the value of CS Tumor Size, as shown in the Extension Size Table for this schema.