CS Extension

Notes

**Note 1**: The assignment of T1 and T2 categories for tumors of the oropharynx 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 305, 310, 540, 705, 810, or 815 as appropriate to code CS Extension based on a statement of T when no other extension information is available. **Note 2**: Use code 300 for localized tumor only if no information is available to assign code 150, 200, 305, 310, or 530.

Code	Description	AJCC 7 T	AJCC 6 T	Summary Stage 1977 T	Summary Stage 2000 T
000	In situ, intraepithelial, noninvasive	Tis	Tis	IS	IS
100	OBSOLETE DATA RETAINED V0200 Epiglottis mapped to T3 in CSv2, see code 530 Invasive tumor confined to one of the following subsites: Anterior wall (including vallecula and lingual (anterior) surface of epiglottis) One lateral wall Posterior wall	ERROR:	Extension Size AJCC6	L	L
150	Invasive tumor confined to one of the following subsites: Anterior wall including vallecula One lateral wall (including tonsillar pillar/fossa, palatine tonsil, tonsil, NOS) Posterior wall	Extension Size AJCC7	Extension Size AJCC6	L	L
200	Involvement of two or more subsites listed in code 100: Posterior, anterior, lateral wall(s)	Extension Size AJCC7	Extension Size AJCC6	L	L
300	Localized, NOS	Extension Size AJCC7	Extension Size AJCC6	L	L
305	Stated as T1 with no other information on extension	Extension Size AJCC7	Extension Size AJCC6	L	L
310	Stated as T2 with no other information on extension	Extension Size AJCC7	Extension Size AJCC6	L	L
400	Soft palate, inferior surface including uvula Soft palate, NOS	Extension Size AJCC7	Extension Size AJCC6	RE	RE
410	OBSOLETE DATA CONVERTED V0200 T4a involvement per curator, see code 630 Hypopharynx NOS Pyriform sinus	ERROR:	ERROR:	ERROR:	ERROR:
420	Soft palate, superior (nasopharyngeal) surface	Extension Size AJCC7	Extension Size AJCC6	RE	RE
500	Base of tongue (including lingual tonsil) Buccal mucosa (inner cheek) Floor of mouth Gum (gingiva)	Extension Size AJCC7	Extension Size AJCC6	RE	RE
510	Any site in codes 150-500 WITH fixation	Extension Size AJCC7	Extension Size AJCC6	RE	RE
520	Involvement of both lateral walls through soft palate or base of tongue	Extension Size AJCC7	Extension Size AJCC6	D	RE
530	Epiglottis, lingual surface	T3	Extension Size AJCC6	L	L
531	530 + 200	T3	Extension Size AJCC6	L	L
533	530 + (400, 420, 500, 510) Epiglottis, lingual surface plus any structure in codes 400, 420, 500, and 510	T3	Extension Size AJCC6	RE	RE
535	530 WITH fixation WITH or WITHOUT involvement of any site in codes 400, 420, 500, and 510	T3	Extension Size AJCC6	RE	RE
538	530 +520 Epiglottis, lingual surface, plus both lateral walls through soft palate or base of tongue	T3	Extension Size AJCC6	D	RE
540	Stated as T3 with no other information on extension	T3	Extension Size AJCC6	RE	RE
550	OBSOLETE DATA RETAINED V0200 Extension to lingual surface of epiglottis assigned to T3 in AJCC 7 See codes 510, 535 Any extension coded in 100-500 WITH fixation	ERROR:	Extension Size AJCC6	RE	RE
600	OBSOLETE DATA REVIEWED AND CHANGED V0203 T4 involvement per curator , see codes 610, 635, 675, 708, 715, 718 Prevertebral fascia or muscle Soft tissue of neck	ERROR:	ERROR:	ERROR:	ERROR:
610	Soft tissue of neck	T4a	T4a	RE	RE
620	OBSOLETE DATA CONVERTED V0200 See code 710 Nasopharynx, lateral, or NOS	ERROR:	ERROR:	ERROR:	ERROR:
630	Hypopharynx NOS Pyriform sinus	T4a	T4a	RE	RE
635	630 + (420, 500, 510, 535, or 610)	T4a	T4a	RE	RE
650	Larynx, NOS Medial pterygoid muscle, or pterygoid muscle, NOS Posterior surface of epiglottis	T4a	T4a	RE	RE
675	(610, 630, 650) + 520 Involvement of any structure in codes 610, 630, and 650 plus involvement of both lateral walls through soft palate or base of tongue	T4a	T4a	D	RE
700	Deep extrinsic muscles of tongue: Genioglossus Geniohyoid Hyoglossus Mylohyoid Palatoglossus Styloglossus Hard palate Mandible	T4a	T4a	D	D
705	Stated as T4a with no other information on exension	T4a	T4a	RE	RE
708	Prevertebral fascia/muscle	T4b	T4b	RE	RE
710	Nasopharynx, lateral or NOS	T4b	T4b	RE	RE
715	(708 or 710) + 520 Prevertebral fascia/muscle or nasopharynx plus involvement of both lateral walls through soft palate or base of tongue	T4b	T4b	D	RE
718	(708 and/or 710) + 700 Prevertebral fascia/muscle or nasopharynx plus any structure in code 700	T4b	T4b	D	D
720	Lateral pterygoid muscle Pterygoid plates	T4b	T4b	D	D
750	Base of skull Bone of skull Bone, NOS (excluding bones in codes 700, 720)	T4b	T4b	D	D
760	OBSOLETE DATA CONVERTED V0200 See code 750 Bone	ERROR:	ERROR:	ERROR:	ERROR:
770	Carotid artery (encased)	T4b	T4b	D	D
800	Further contiguous extension: Anterior 2/3 of tongue Parotid gland	T4b	T4b	D	D
810	Stated as T4b with no other information on extension	T4b	T4b	D	D
815	Stated as T4 [NOS] with no other information on extension	T4NOS	T4NOS	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 150-520 ONLY, the T category for AJCC 7staging 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 100-550 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.