CS Extension

Notes

**Note 1**: AJCC does not include a Tis category for Neuroendocrine Tumors (NET)) of the rectum/rectosigmoid. CS Extension code 000 is mapped to TX for AJCC stage and in situ Summary Stage. **Note 2**: For rectosigmoid, ignore intraluminal extension to adjacent segment(s) of colon and rectum; code depth of invasion or rectosigmoidal 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 code 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	Submucosa (superficial invasion), including submucosa in the stalk of a polyp	Extension Size AJCC7	T1	L	L
165	For rectum: Intraluminal extension to rectosigmoid Intraluminal extension to anal canal/anus	Extension Size AJCC7	T1	RE	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 rectum, NOS	Extension Size AJCC7	T1	L	L
400	Extension through wall, NOS Invasion 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
405	(200 or 400) +165	T3	T3	RE	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	OBSOLETE DATA RETAINED AND REVIEWED V0203 See codes 165, 405, 455, and 610 Adjacent (connective) tissue: For all sites: Perirectal fat For rectosigmoid: Mesentery (including mesenteric fat, mesocolon) Pericolic fat For rectum: Extension to anus Rectovaginal septum	T3	T3	RE	RE
455	Adjacent (connective) tissue: For all sites: Perirectal fat For rectosigmoid: Mesentery (including mesenteric fat, mesocolon) Pericolic fat For rectum: Rectovaginal septum	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	OBSOLETE DATA RETAINED AND REVIEWED V0203 See codes 555, 610 (500) with [(420 or (450)]	T4	T4	RE	RE
555	500 + (165, 405, 455, or 458)	T4	T4	RE	RE
570	Adherent to other organs or structures, NOS	T4	T4	RE	RE
600	OBSOLETE DATA CONVERTED V0203 See code 610 Rectosigmoid: Cul de sac (rectouterine pouch) Pelvic wall Small intestine Rectum: Bladder for males only Cul de sac (rectouterine pouch) Ductus deferens Pelvic wall Prostate Rectovesical fascia for male only Seminal vesicle(s) Skeletal muscle of pelvic floor Vagina	ERROR:	ERROR:	ERROR:	ERROR:
610	For all sites: Cul de sac (rectouterine pouch) Pelvic wall For rectosigmoid: Pelvic plexuses Small intestine For rectum: Anus (excluding intraluminal extension) Bladder for males only Ductus deferens Prostate Rectovesical fascia for males only Seminal vesicle(s) Skeletal muscle of pelvic floor Vagina	T4	T4	RE	RE
700	For rectosigmoid: Bladder Colon via serosa Fallopian tube(s) Ovary(ies) Prostate Ureter(s) Uterus For rectum: Bladder for females only Bone(s) of pelvis Urethra Uterus	T4	T4	D	D
800	Further contiguous extension including: For all sites: Other segments of colon via serosa For rectosigmoid: Skeletal muscles of pelvic floor Vagina For rectum: Sacral plexus Sacrum Ovary(ies) Perineum, perianal skin	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 CSExtension codes 000-190 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 AJCC 7 Table for this schema.