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.