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.