CS Extension

Notes

**Note 1**: AJCC stages carcinoma of pharyngeal tonsil using schema for oropharynx. **Note 2**: 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 330, 350, 575, 665, 810, or 815 as appropriate to code CS Extension based on a statement of T when no other extension information is available. **Note 3**: Use code 305 for localized tumor only if no information is available to assign code 100, 200, 305, or 310.

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 Invasive tumor confined to one of the following subsites: Inferior wall (superior surface of soft palate) One lateral wall Posterior superior wall (vault)	ERROR:	Extension Size AJCC6	L	L
105	Invasive tumor confined to: Pharyngeal tonsil (nasopharyngeal tonsil) Adenoid Posterior superior wall (vault)	Extension Size AJCC7	Extension Size AJCC6	L	L
200	OBSOLETE DATA RETAINED V0200 Involvement of two or more subsites: Lateral wall extending into Eustachian tube/middle ear Posterior, inferior, or lateral wall(s)	ERROR:	Extension Size AJCC6	L	L
205	Involvement of inferior wall of nasopharynx (superior surface of soft palate)	Extension Size AJCC7	Extension Size AJCC6	L	L
300	OBSOLETE DATA RETAINED V0200 Confined to nasopharynx Localized, NOS	ERROR:	Extension Size AJCC6	L	L
305	Confined to pharyngeal tonsil Localized, NOS	Extension Size AJCC7	Extension Size AJCC6	L	L
330	Stated as T1 with no other information on extension	Extension Size AJCC7	Extension Size AJCC6	L	L
350	Stated as T2 with no other information on extension	Extension Size AJCC7	Extension Size AJCC6	L	L
400	Oropharynx Soft palate, inferior surface including uvula	Extension Size AJCC7	Extension Size AJCC6	RE	RE
500	Nasal cavity	Extension Size AJCC7	Extension Size AJCC6	RE	RE
530	Pterygopalatine fossa	Extension Size AJCC7	Extension Size AJCC6	RE	RE
550	OBSOLETE DATA RETAINED V0200 Any extension coded in 100-500 WITH fixation or tumor Described only as FIXED	ERROR:	Extension Size AJCC6	RE	RE
555	Any extension coded in 105, 205, 305, 400, 500, or 530 WITH fixation or tumor described only as FIXED	Extension Size AJCC7	Extension Size AJCC6	RE	RE
560	OBSOLETE DATA RETAINED V0200 Any extension coded in 100-500 WITH parapharyngeal extension	ERROR:	Extension Size AJCC6	RE	RE
565	OBSOLETE DATA RETAINED AND REVIEWED V0203 See code 566 Any extension coded in 100, 200, 400, 500, or 530 WITH parapharyngeal extension	Extension Size AJCC7	Extension Size AJCC6	RE	RE
566	Any extension coded in 105, 205, 305, 400, 500, or 530 WITH parapharyngeal extension	Extension Size AJCC7	Extension Size AJCC6	RE	RE
568	Lingual surface of epiglottis	T3	Extension Size AJCC6	D	D
570	OBSOLETE DATA CONVERTED V0200 Site/histology moved to new schema V0200 See code 610 Hard palate	ERROR:	ERROR:	ERROR:	ERROR:
575	Stated as T3 with no other information on extension	T3	Extension Size AJCC6	L	L
580	OBSOLETE DATA RETAINED V0200 Site/histology moved to new schema V0200 See code 530 Pterygopalatine fossa	ERROR:	Extension Size AJCC6	RE	RE
600	OBSOLETE DATA RETAINED V0200 Site/histology moved to new schema V0200 See code 760 Bone including skull	ERROR:	T4b	RE	RE
610	Hard palate	T4a	T4a	D	RE
620	Paranasal sinus	T4a	T4a	D	RE
640	(610, 620) + 568 Any structure in code 610 or 620 plus lingual surface of epiglottis	T4a	T4a	D	D
645	Larynx Hypopharynx Extrinsic muscle of tongue Medial pterygoid muscle Mandible	T4a	T4a	D	D
650	OBSOLETE DATA REVIEWED AND CHANGED V0200 In CS version 1, extension to the orbit was included in both codes 650 and 700. In addition, the isntructions for coding invasion of orbital bone were not clear. Codes 650 and 700 should be reviewed for orbital involvement. Involvement of bone of floor of orbit should be coded 760, and other orbit involvement should be coded 780. Orbit	ERROR:	ERROR:	ERROR:	ERROR:
665	Stated as T4a with no other information on extension	T4a	T4a	RE	RE
700	OBSOLETE DATA REVIEWED AND CHANGED V0200 See note in code 650 Brain Cranial nerves Hypopharynx Infratemporal fossa Orbit Intracranial extension, NOS	ERROR:	ERROR:	ERROR:	ERROR:
710	Lateral nasopharynx	T4b	T4b	L	L
715	710 + (400 - 550) Lateral nasopharynx plus any structure in codes 400 through 530	T4b	T4b	RE	RE
718	710 + (610, 620) Lateral nasopharynx plus hard palate or paranasal sinus	T4b	T4b	D	RE
730	710 + 568 Lateral nasopharynx plus lingual surface of epiglottis	T4b	T4b	D	D
740	Lateral pterygoid muscle Pterygoid plates	T4b	T4b	D	D
750	OBSOLETE DATA RETAINED V0200 Site/histology moved to new schema V0200 See code 780 Masticator space	ERROR:	T4b	D	D
760	Bony structures of skull base Floor of orbit	T4b	T4b	RE	RE
765	760 + (610, 620) Any structure in 760 plus hard palate or paranasal sinus	T4b	T4b	D	RE
770	760 + 568 Any structure in 760 plus lingual surface of epiglottis	T4b	T4b	D	D
780	Brain Cranial nerve involvement Hypopharynx Infratemporal fossa/Masticator space Orbit	T4b	T4b	D	D
790	Carotid artery (encased	T4b	T4b	D	D
800	Further contiguous extension including: Soft tissues of the neck	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	L	L
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 105, 205, 305, 330, 350, 400, 500, 530, 555, and 565 ONLY, the T category for AJCC 7 staging is assigned based on the value of CS Tumor Size as shown in the Extension Size Table AJCC 7 for this schema. - For CS Extension codes 100 through 568, 575, and 580 ONLY, the T category for AJCC 6 staging is assigned based on the value of CS Tumor Size as shown in the Extension Size Table AJCC 6 for this schema.