CS Extension

Notes

**Note**: The assignment of T categories for gastrointestinal stromal tumors (GIST) 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 350. 360, 370, and 380 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
100 Tumor confined to site of origin Extension Size AJCC7 Extension Size AJCC6 L L
300 Localized, NOS Extension Size AJCC7 Extension Size AJCC6 L L
350 Stated as T1 with no other information on extension Extension Size AJCC7 Extension Size AJCC6 L L
360 Stated as T2 with no other information on extension Extension Size AJCC7 Extension Size AJCC6 L L
370 Stated as T3 with no other information on extension Extension Size AJCC7 Extension Size AJCC6 L L
380 Stated as T4 with no other information on extension Extension Size AJCC7 Extension Size AJCC6 L L
400 Adjacent connective tissue Extension Size AJCC7 Extension Size AJCC6 RE RE
500 OBSOLETE DATA CONVERTED V0203
See code 360

Stated T2[NOS]		 ERROR: ERROR: ERROR: ERROR:
510 OBSOLETE DATA CONVERTED V0203
See code 370

Stated T3[NOS]		 ERROR: ERROR: ERROR: ERROR:
520 OBSOLETE DATA CONVERTED V0203
See Code 380

Stated T4[NOS]		 ERROR: ERROR: ERROR: ERROR:
600 Adjacent organs/structures including bone/cartilage:
For retroperitoneum:
Adrenal(s) (suprarenal gland(s))
Aorta
Ascending colon
Descending colon
Kidney(s)
Pancreas
Inferior vena cava (IVC)
Vertebra
For peritoneum:
Colon (except ascending and descending colon)
Esophagus
Gallbladder
Liver
Small intestine
Spleen
Stomach		 Extension Size AJCC7 Extension Size AJCC6 RE RE
800 Further contiguous extension, including:
For retroperitoneum:
Colon other than ascending or descending
For peritoneum:
Ascending colon
Descending colon		 Extension Size AJCC7 Extension Size AJCC6 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
- For CS Extension codes 100-800 ONLY, the T category for AJCC 7 staging is assigned based on the value of CS Tumor Size, as shown in the Extension Size AJCC 7 Table for this schema. - For CS Extension codes 100-800 ONLY, the T category for AJCC 6 staging is assigned based on the value of CS Tumor Size, as shown in the Extension Size AJCC 6 Table for this schema.