CS Extension
Notes
**Note 1**: AJCC does not include a T category or stage grouping for in situ 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 305 and 315 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 310 for localized tumor only if no information is available to assign code 105, 205, 305, 340, 345, or 400. **Note 5**: Use code 320, 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 confined to site of origin |
ERROR: | NA | L | L |
| 105 | Tumor confined to mucosa of site of origin | T3 | NA | L | L |
| 200 | OBSOLETE DATA RETAINED V0200 Tumor involves more than one subsite, WITHOUT fixation or NOS |
ERROR: | NA | L | L |
| 205 | Extension involving mucosa only of more than one subsite of supraglottis, glottis, or subglottis WITHOUT impairment of vocal cord mobility or fixation of larynx or NOS |
T3 | NA | L | L |
| 300 | OBSOLETE DATA RETAINED V0200 Tumor involves adjacent regions(s) of larynx |
ERROR: | NA | L | L |
| 305 | Extension involving mucosa only of adjacent region(s) of larynx WITHOUT impairment of vocal cord mobility or fixation of larynx or NOS |
T3 | NA | L | L |
| 310 | Localized, NOS | T3 | NA | L | L |
| 315 | Extension involving mucosa only of adjacent regions: Base of tongue Hypopharynx, NOS Pre-epiglottic tissues Postcricoid area Pyriform sinus Vallecula |
T3 | NA | RE | RE |
| 320 | Stated as T3 with no other information on extension | T3 | NA | L | L |
| 340 | Involvement of deep tissues of any structures in code 105, 205, or 305 Soft tissue, NOS |
T4a | NA | L | L |
| 345 | Involvement of any structure in code 105, 205, or 305 WITH impaired vocal cord mobility | T4a | NA | L | L |
| 350 | OBSOLETE DATA RETAINED V0200 Impaired vocal cord mobility |
ERROR: | NA | L | L |
| 400 | Tumor limited to larynx WITH vocal cord fixation |
T4a | NA | L | L |
| 450 | OBSOLETE DATA RETAINED V0200 Localized, NOS |
ERROR: | NA | L | L |
| 460 | (340, 345, or 400) + 315 Involvement of any structures in code 340, 345, or 400 plus mucosal involvement of any structures in code 315 |
T4a | NA | RE | RE |
| 500 | Involvement of deep tissue or musculature of any structure in code 315 WITH or WITHOUT vocal impairment or fixation of larynx or NOS |
T4a | NA | RE | RE |
| 600 | OBSOLETE DATA RETAINED V0200 Hypopharynx, NOS Postcricoid area Pre-epiglottic tissues Pyriform sinus (pyriform fossa) Vallecula |
ERROR: | NA | RE | RE |
| 680 | Extension to/through: Cricoid cartilage Thyroid cartilage |
T4a | NA | RE | D |
| 700 | Extension to/through: Cervical esophagus Deep muscle of tongue Extrinsic (strap) muscles: Omohyoid Sternohyoid Sternothyroid Thyrohyoid Oropharynx Skin Soft tissues of neck Thyroid gland 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 |