CS Extension

Notes

**Note 1**: AJCC does not include an in situ category for carcinoid tumors of appendix. Any case so coded will be mapped to TX for AJCC 7 stage and in situ Summary Stage. Cases coded with 000 will continue to map to Tis if AJCC 6 staging is applicable. **Note 2**: The assignment of T1, T1a, and T1b categories for carcinoid of appendix 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 code 320, 330, or 335, 410, 490, or 850 as appropriate to code CS Extension based on a statement of T when no other extension information is available. **Note 3**: Codes 405-750 are used for contiguous extension from the site of origin. Discontinuous involvement is coded in CS Mets at DX. **Note 4**: Tumor that is adherent to other organs or structures, macroscopically, is classified cT4b. If tumor is present in adhesion(s) upon microscopic examination, the tumor is classified as pT4b. Use code 565 for macroscopic adhesions if no pathologic confirmation, and for pathologically confirmed tumor in adhesions. However, if no tumor is present in adhesion(s) upon microscopic examination, the classification is based upon extent of tumor invasion into or through the wall; use codes 000, 100, 160, 200, 370, 451, and 470 as appropriate to describe the microscopically confirmed depth of tumor invasion for these cases. Use codes 601-650, 670, 701, and 751-800 to code invasion of underlying structures from the adherent tumor.

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	(Adeno)carcinoma, noninvasive, in a polyp or adenoma	TX	Tis	IS	IS
100	Invasive tumor confined to mucosa, NOS (including intramucosal, NOS)	Extension Size AJCC7	Tis	L	L
110	Invades lamina propria	Extension Size AJCC7	Tis	L	L
120	Invades muscularis mucosae	Extension Size AJCC7	Tis	L	L
130	OBSOLETE DATA RETAINED V0200 Confined to head of polyp, NOS	ERROR:	T1	L	L
140	OBSOLETE DATA RETAINED V0200 Confined to stalk of polyp, NOS	ERROR:	T1	L	L
150	OBSOLETE DATA RETAINED V0200 Invasive tumor in polyp, NOS	ERROR:	T1	L	L
160	Invades submucosa (superficial invasion)	Extension Size AJCC7	T1	L	L
200	Invades muscularis propria	Extension Size AJCC7	T2	L	L
300	Confined to appendix, NOS Localized, NOS	Extension Size AJCC7	T1	L	L
310	OBSOLETE DATA CONVERTED V0203 See code 335 Stated as T1, NOS with no other information on extension	ERROR:	ERROR:	ERROR:	ERROR:
320	Stated as T1a with no other information on extension	Extension Size AJCC7	T1	L	L
330	Stated as T1b with no other information on extension	Extension Size AJCC7	T1	L	L
335	Stated as T1 [NOS] with no other information on extension	Extension Size AJCC7	T1	L	L
340	OBSOLETE DATA CONVERTED V0203 See code 410 Stated as T2 with no other information on extension	ERROR:	ERROR:	ERROR:	ERROR:
350	OBSOLETE DATA CONVERTED V0203 See code 490 Stated as T3 with no other information on extension	ERROR:	ERROR:	ERROR:	ERROR:
370	Extension to cecum	Extension Size AJCC7	T1	L	L
400	OBSOLETE DATA REVIEWED AND CHANGED V0203 Code 400 was defined as "Extension through wall, NOS, Non-peritonealized pericolic tissues invaded, Perimuscular tissue invaded, Subserosal tissue/(sub)serosal fat invaded, Transmural, NOS in CSv1. Code 400 was defined as "Extension to cecum" in CSv2: V0201, V0202. All cases should be reviewed and recoded to appropriate codes; see codes 370, 401. Extension to cecum	ERROR:	ERROR:	ERROR:	ERROR:
401	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	Extension Size AJCC7	T3	L	L
410	Stated as T2 with no other information on extension	Extension Size AJCC7	TX	L	L
420	OBSOLETE DATA CONVERTED V0203 See code 458 Fat, NOS	ERROR:	ERROR:	ERROR:	ERROR:
450	OBSOLETE DATA REVIEWED AND CHANGED V0203 Code 450 was defined as "Extension to: Adjacent tissue(s), NOS, Connective tissue, Mesenteric fat, Mesentery, Mesoappendix, Mesocolon, Pericolic fat" in CSv1. Code 450 was defined as "Extension to ileum" in CSv2: V0201, V0202. All cases should be reviewed and recoded to appropriate codes; see codes 451, 470. Extension to ileum	ERROR:	ERROR:	ERROR:	ERROR:
451	Extension to: Adjacent tissue(s), NOS Connective tissue Mesenteric fat Mesentery Mesoappendix Mesocolon Pericolic fat	Extension Size AJCC7	T3	RE	RE
458	Fat, NOS	Extension Size AJCC7	T3	RE	RE
460	OBSOLETE DATA RETAINED V0200 Adherent to other organs or structures, but no microscopic tumor found in adhesion(s)	ERROR:	T3	RE	RE
470	Extension to ileum	T3	T4	RE	RE
490	Stated as T3 with no other information on extension	T3	TX	RE	RE
500	OBSOLETE DATA REVIEWED AND CHANGED V0203 Code 500 was defined as "Invasion of/through serosa (mesothelium) (visceral peritoneum)" in CSv1. Code 500 was defined as "Abdominal wall, Skeletal muscles" in CSv2: V0201, V0202. All cases should be reviewed and recoded to appropriate codes; see codes 501, 650, and 670 Abdominal wall Skeletal muscles	ERROR:	ERROR:	ERROR:	ERROR:
501	OBSOLETE DATA RETAINED V0203 Invasion of/through serosa (mesothelium) (visceral peritoneum)	ERROR:	T4	RE	RE
550	OBSOLETE DATA RETAINED V0200 Any of [(420) to (451)] + (501)	ERROR:	T4	RE	RE
565	Adherent to other organs or structures clinically with no microscopic examination Tumor found in adhesion(s) if microscopic examination performed	T4	T3	RE	RE
570	Adherent to other organs or structures, NOS	T4	T4	RE	RE
600	OBSOLETE DATA REVIEWED AND CHANGED V0203 Code 600 was defined as "Small intestine, Greater omentum" in CSv1. Code 600 was defined as "Perineum, Vulva" in CSv2: V0201, V0202. All cases should be reviewed and recoded to appropriate codes; see codes 601, 800. Perineum Vulva	ERROR:	ERROR:	ERROR:	ERROR:
601	Small intestine Greater omentum	T4	T4	RE	RE
650	Abdominal wall Retroperitoneum (excluding fat)	T4	T4	RE	RE
660	OBSOLETE DATA RETAINED V0200 Ascending colon: Right kidney Right ureter Descending colon: Left kidney Left ureter	ERROR:	T4	RE	RE
670	Skeletal muscle	T4	T4	D	D
700	OBSOLETE DATA REVIEWED AND CHANGED V0203 Code 700 was defined as "Bladder, Pelvic peritoneum, Urethra, Vagina" in CSv1. Code 700 was defined as "Fallopian tube, Ovary, Uterus" in CSv2: V0201, V0202. All cases should be reviewed and recoded to appropriate codes; see codes 701, 800. Bladder Pelvic peritoneum Urethra Vagina	ERROR:	ERROR:	ERROR:	ERROR:
701	Bladder Pelvic peritoneum Urethra Vagina	T4	T4	D	D
750	OBSOLETE DATA REVIEWED AND CHANGED V0203 Code 750 was defined as "Adrenal (suprarenal) gland, Bladder, Diaphragm, Fistula to skin, Gallbladder, Other segment(s) of colon via serosa" in CSv1. Code 750 was defined as "Broad ligament(s), Cervix uteri, Corpus uteri, Prostate" in CSv2: V0201, V0202. All cases should be reviewed and recoded to appropriate codes; see codes 751, 800. Broad ligament(s) Cervix uteri Corpus uteri Prostate	ERROR:	ERROR:	ERROR:	ERROR:
751	Adrenal (suprarenal) gland Diaphragm Fistula to skin Gallbladder Other segment(s) of colon via serosa	T4	T4	D	D
800	Further contiguous extension: Kidney Liver Ureter Other contiguous extension	T4	T4	D	D
850	Stated as T4 with no other information on extension	T4	T4	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 100-120, 160-300, 320-335, 370, 401-410, and 451 ONLY, the T category is assigned based on the value of CS Tumor Size, as shown in the Extension Size AJCC 7 Table for this schema.