CS Extension
Notes
**Note 1**: Impaired vocal cord mobility may be described as vocal cord paresis, and may suggest invasion of intrinsic laryngeal muscle. Fixation of the vocal cord maybe described as immobility of the arytenoids noted on endoscopy, paralysis of the vocal cords, or deviation of larynx to the fixed side. **Note 2**: Use code 450 for localized tumor only if no information is available to assign codes 100 through 400. **Note 3**: Use code 375, 630, 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 | Tis | Tis | IS | IS |
| 100 | Invasive tumor confined to site of origin Stated as T1 with no other information on extension |
T1 | T1 | L | L |
| 200 | Tumor involves more than one subsite of supraglottis or glottis WITHOUT fixation or NOS |
T2 | T2 | L | L |
| 300 | Tumor involves adjacent regions(s) of larynx | T2 | T2 | L | L |
| 350 | Impaired vocal cord mobility | T2 | T2 | L | L |
| 375 | Stated as T2 with no other information on extension | T2 | T2 | L | L |
| 400 | OBSOLETE DATA RETAINED AND REVIEWED V0203 See codes 410, 630 Tumor limited to larynx WITH vocal cord fixation Stated as T3 with no other information on extension |
T3 | T3 | L | L |
| 410 | Tumor limited to larynx WITH vocal cord fixation | T3 | T3 | L | L |
| 450 | Localized, NOS | T1 | T1 | L | L |
| 500 | Invasion of inner cortex of thyroid cartilage | T3 | T3 | RE | RE |
| 600 | Base of tongue Hypopharynx, NOS Postcricoid area Pre-epiglottic tissues Pyriform sinus (pyriform fossa) Vallecula |
T3 | T3 | RE | RE |
| 630 | Stated as T3 with no other information on extension | T3 | T3 | L | L |
| 680 | Extension to/through cricoid cartilage and thyroid cartilage (See code 500) |
T4a | T4a | RE | D |
| 700 | Extension to/through: Cervical esophagus Deep extrinsic muscle(s) of tongue Strap muscle(s): Omohyoid Sternohyoid Sternothyroid Thyrohyoid Oropharynx Skin Soft tissues of neck Thyroid gland Trachea |
T4a | T4a | D | D |
| 775 | Stated as T4a with no other information on extension | T4a | T4a | RE | RE |
| 800 | Further contiguous extension, including: Carotid artery (encased) Mediastinal structures Prevertebral space |
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 |