CS Extension

Notes

**Note 1**: AJCC does not include a Tis or TX category for melanoma of mucosa of head and neck sites. CS Extension codes of 000 and 999 are mapped to NA and AJCC stage group is derived as NA. **Note 2**: AJCC does not include a T1 or T2 category for mucosal melanoma of head and neck sites. **Note 3**: Use codes 250 and 305 for extension involving the mucosa only of adjacent sites. Use higher codes for extension involving deeper tissues of the primary or adjacent sites. **Note 4**: Use code 275 for localized tumor only if no information is available to assign code 105, 205, 250, 370, 375, or 405. **Note 5**: Use code 340, 775, 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 NA NA IS IS
100 OBSOLETE DATA RETAINED V0200

Invasive tumor with normal vocal cord mobility confined to:
Supraglottis (one subsite):
Aryepiglottic fold
Arytenoid cartilage
Corniculate cartilage
Cuneiform cartilage
Epilarynx, NOS
False cords
Ventricular bands
Ventricular cavity
Ventricular fold
Infrahyoid epiglottis
Laryngeal cartilage, NOS
Laryngeal (posterior) surface of epiglottis
Suprahyoid epiglottis (including tip, lingual {anterior} and laryngeal surfaces)
ERROR: NA L L
105 Tumor confined to mucosa of supraglottis:
Supraglottis (one subsite):
Aryepiglottic fold
Arytenoid cartilage:
Corniculate cartilage
Cuneiform cartilage
Epilarynx, NOS
False cords:
Ventricular bands
Ventricular cavity
Ventricular fold
Infrahyoid epiglottis
Laryngeal cartilage, NOS
Laryngeal (posterior) surface of epiglottis
Suprahyoid epiglottis (including tip, lingual {anterior} and laryngeal surfaces)
WITH normal vocal cord mobility
T3 NA L L
200 OBSOLETE DATA RETAINED V0200

Tumor involves more than one subsite of supraglottis
WITHOUT fixation or NOS
ERROR: NA L L
205 Extension involving mucosa only of more than one subsite of supraglottis listed in code 105
WITHOUT impaired vocal cord mobility or fixation of larynx or NOS
T3 NA L L
250 Extension involving mucosa only of glottic larynx or subglottis
WITHOUT impaired vocal cord mobility or fixation of larynx or NOS
T3 NA L L
275 Localized, NOS T3 NA L L
300 OBSOLETE DATA RETAINED V0200

Tumor involves adjacent regions(s) of larynx
ERROR: NA RE RE
305 Extension involving mucosa only of adjacent regions(s) outside supraglottis including:
Mucosa of base of tongue
Vallecula
Medial wall of pyriform sinus
WITHOUT impaired vocal cord mobility or fixation of larynx or NOS
T3 NA RE RE
340 Stated as T3 with no other information on extension T3 NA L L
350 OBSOLETE DATA RETAINED V0200

Impaired vocal cord mobility
ERROR: NA L L
370 Involvement of deep tissues of any structure in code 105, 205, or 250 T4a NA L L
375 Involvement of any structures in code 105, 205, or 250
WITH impaired vocal cord mobility
T4a NA L L
400 OBSOLETE DATA RETAINED V0200

Tumor limited to larynx WITH vocal cord fixation
ERROR: NA L L
405 Involvement of any structures in supraglottic larynx larynx, and subglottic larynx
WITH vocal cord fixation
T4a NA L L
410 (370, 375, 405) + 305

Involvement of any structures in code 370, 375, or 405 plus mucosal involvement of any structure in code 305
T4a NA RE RE
420 Involvement of deep tissue of any structure in code 305 T4a NA RE RE
425 Involvement of any structure in code 305
WITH impaired vocal cord mobility
T4a NA RE RE
450 OBSOLETE DATA RETAINED V0200

Localized, NOS
ERROR: NA L L
520 Paraglottic space
WITHOUT vocal cord fixation
T4a NA RE RE
530 Minor thyroid cartilage erosion (inner cortex)
WITHOUT vocal cord fixation
T4a NA RE D
600 OBSOLETE DATA RETAINED V0200

Tumor involves region outside the supraglottis
WITHOUT fixation, including:
Medial wall of pyriform sinus
Mucosa of base of tongue
Vallecula
ERROR: NA RE RE
605 Tumor involves further regions outside the supraglottis including:
Deep tissues or musculature:
Base of tongue
Medial wall pyriform sinus
Vallecula
Hypopharynx, NOS
Pre-epiglottic tissues
Postcricoid area
Pyriform sinus. NOS
WITHOUT vocal cord fixation
T4a NA RE RE
620 Involvement of any structures in codes 520, 530, and 605
WITH vocal cord fixation
T4a NA RE RE
630 605 + 530

Any structure in code 605 plus minor thyroid cartilage erosion
T4a NA RE D
650 OBSOLETE DATA CONVERTED V0200
See code 605

Hypopharynx, NOS
Postcricoid area
Pre-epiglottic tissues
ERROR: ERROR: ERROR: ERROR:
660 OBSOLETE DATA CONVERTED V0200
See code 605

Deep base of tongue
ERROR: ERROR: ERROR: ERROR:
670 Cricoid cartilage T4a NA RE RE
675 670 + 530 T4a NA RE RE
680 OBSOLETE DATA CONVERTED V0200
See code 530

Minor thyroid cartilage erosion (e.g., inner cortex)
ERROR: ERROR: ERROR: ERROR:
700 Extension to/through:
Esophagus
Oropharynx
Soft tissues of neck
Thyroid cartilage (except minor erosion, see code 530)
Thyroid gland
T4a NA D D
720 Extension to/through:
Strap muscle(s):
Omohyoid
Sternohyoid
Sternothyroid
Thyrohyoid
Skin
T4a NA D D
730 Extension to/through:
Deep extrinsic muscles of tongue
Trachea
T4a NA D D
775 Stated as T4a with no other information on extension T4a NA L L
800 Contiguous extension, including:
Carotid artery (encased)
Mediastinal structures
Prevertebral space
T4b NA D D
801 Further contiguous extension including:
Base of skull
Brain
Dura
Lower cranial nerves (IX, X, XI, XII)
Masticator space
T4b NA D D
810 Stated as T4b with no other information on extension T4b NA D D
815 Stated as T4 [NOS] with no other information on extension T4NOS NA L L
950 OBSOLETE DATA RETAINED V0200

No evidence of primary tumor
ERROR: NA U U
999 Unknown; extension not stated
Primary tumor cannot be assessed
Not documented in patient record
NA NA U U