CS Extension

Notes

**Note 1**: If there is fixation of hemilarynx or larynx, code to 550, not 420 or 450. **Note 2**: Use code 300 for localized tumor only if no information is available to assign code 100, 200, or 305. **Note 3**: Use code 305, 455, 565, 638, 810, or 815 if the physician's assignment of T category is the only information available about the extent of the tumor.

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	Invasive tumor confined to one of the following subsites: Laryngopharynx Postcricoid area Posterior pharyngeal wall Pyriform sinus	Extension Size	Extension Size	L	L
150	OBSOLETE DATA CONVERTED V0200 See code 420 Code 100 with tumor fixation	ERROR:	ERROR:	ERROR:	ERROR:
200	Tumor invades more than one subsite of hypopharynx (listed in code 100) WITHOUT fixation of hemilarynx	Extension Size	Extension Size	L	L
300	Localized, NOS	Extension Size	Extension Size	L	L
305	Stated as T1 with no other information on extension	Extension Size	Extension Size	L	L
400	Oropharynx	Extension Size	Extension Size	RE	RE
420	Code 100 with tumor fixation WITHOUT fixation of hemilarynx	Extension Size	Extension Size	RE	RE
450	Code 200, 300, or 400 with tumor fixation WITHOUT fixation of hemilarynx	Extension Size	Extension Size	RE	RE
455	Stated as T2 with no other information on extension	Extension Size	Extension Size	L	L
500	Larynx WITHOUT fixation	Extension Size	Extension Size	RE	RE
510	OBSOLETE DATA CONVERTED V0104 See code 450 Any of codes 100-400 WITH fixation of tumor or fixation, NOS	ERROR:	ERROR:	ERROR:	ERROR:
550	Fixation of hemilarynx or larynx	T3	T3	RE	RE
560	Esophagus	T3	T4a	RE	RE
565	Stated as T3 with no other information on extension	T3	T3	RE	RE
600	Central compartment soft tissues of neck including: Prelaryngeal strap muscles Subcutaneous fat	T4a	T4a	RE	RE
610	OBSOLETE DATA CONVERTED V0200 Assigned to T3 in AJCC7, see code 560 Esophagus	ERROR:	ERROR:	ERROR:	ERROR:
620	Thyroid gland	T4a	T4a	D	RE
630	Cricoid cartilage Thyroid cartilage	T4a	T4a	D	RE
635	Hyoid bone	T4a	T4a	D	D
638	Stated as T4a with no other information on extension	T4a	T4a	RE	RE
640	Prevertebral fascia/muscle(s)	T4b	T4b	RE	RE
645	640 + 635 Prevertebral fascia/muscles plus hyoid bone	T4b	T4b	D	D
650	Carotid artery (encased)	T4b	T4b	D	RE
655	650 + 635 Carotid aratery plus hyoid bone	T4b	T4b	D	D
660	OBSOLETE DATA CONVERTED V0200 See code 635 Hyoid bone	ERROR:	ERROR:	ERROR:	ERROR:
700	Mediastinal structures	T4b	T4b	D	D
760	Base of tongue Floor of mouth Nasopharynx	T4b	T4b	D	D
800	Further contiguous extension	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 CSExtension codes 100, 200, 300, 305, 400, 420, 450, and 500 ONLY, the T category for AJCC 7 staging is assigned based on the value of CS Tumor Size and CS Extension as shown in the Extension Size Table for this schema. - For CS Extension codes 100, 200, 300, 305, 400, 420, 450, and 500 ONLY, the T category for AJCC 6 staging is assigned based on the value of CS Tumor Size and CS Extension as shown in the Extension Size Table for this schema.