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 405, 415, 425, 430, 505, 510, and 515 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 300 for localized tumor only if no information is available to assign code 105 or 205, 520, or 540. **Note 5**: Use code 520, 705, 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 one of the following subsites: Anterior wall (including vallecula and lingual (anterior) surface of epiglottis) One lateral wall Posterior wall |
ERROR: | NA | L | L |
| 105 | Tumor confined to mucosa of one of the following subsites: Anterior wall: Lingual (anterior surface of epiglottis) Vallecula One lateral wall Posterior wall |
T3 | NA | L | L |
| 200 | OBSOLETE DATA RETAINED V0200 Involvement of two or more subsites: Posterior, anterior or lateral wall(s) |
ERROR: | NA | L | L |
| 205 | Involvement of mucosa only of two or more subsites: Anterior wall: Lingual (anterior) surface of epiglottis Vallecula Lateral wall(s) Posterior wall |
T3 | NA | L | L |
| 300 | Localized, NOS | T3 | NA | L | L |
| 400 | OBSOLETE DATA RETAINED V0200 Soft palate, inferior surface including uvula, or soft palate, NOS |
ERROR: | NA | RE | RE |
| 405 | Involvement of mucosa only: Soft palate, inferior surface, including uvula Soft palate, NOS |
T3 | NA | RE | RE |
| 410 | OBSOLETE DATA RETAINED V0200 Hypopharynx NOS Pyriform sinus |
ERROR: | NA | RE | RE |
| 415 | Involvement of mucosa only: Hypopharynx, NOS Pyriform sinus |
T3 | NA | RE | RE |
| 420 | OBSOLETE DATA RETAINED V0200 Soft palate, superior (nasopharyngeal) surface |
ERROR: | NA | RE | RE |
| 425 | Involvement of mucosa only of soft palate, superior (nasopharyngeal) surface | T3 | NA | RE | RE |
| 430 | Involvement of mucosa only: Nasopharynx Larynx Posterior surface of epiglottis |
T3 | NA | RE | RE |
| 500 | OBSOLETE DATA RETAINED V0200 Base of tongue Buccal mucosa (inner cheek) Floor of mouth Gum (gingiva) |
ERROR: | NA | RE | RE |
| 505 | Involvement of mucosa only: Base of tongue Buccal mucosa (inner cheek) Floor of mouth Gum (gingiva) |
T3 | NA | RE | RE |
| 510 | Involvement of mucosa only of both lateral walls through soft palate or base of tongue | T3 | NA | D | RE |
| 515 | Involvement of mucosa only: Anterior two-thirds of tongue Hard palate |
T3 | NA | D | D |
| 520 | Stated as T3 with no other information on extension | T3 | NA | L | L |
| 540 | Involvement of deep soft tissue or musculature of any structure in code 105 | T4a | NA | L | L |
| 545 | 540 + (405, 415, 425, 430, or 505) Involvement of deep soft tissue or musculature of any structure in code 105 plus mucosal involvement of any structure in code 405, 415, 425, 430, or 505 |
T4a | NA | RE | RE |
| 550 | Any extension coded in 105 - 505 WITH fixation |
T4a | NA | RE | RE |
| 555 | Involvement of deep soft tissue or musculature of any structure in codes 405, 415, 425, 430, and 505 | T4a | NA | RE | RE |
| 560 | (540 - 555) + 510 Any involvement in codes 540 - 555 plus mucosal involvement of the structures in code 510 |
T4a | NA | D | RE |
| 565 | (540 - 560) + 515 Any involvement in codes 540 - 560 plus mucosal involvement of hard palate |
T4a | NA | D | D |
| 570 | Involvement of deep soft tissue or musculature of both lateral walls, soft palate, or base of tongue with contiguous involvement through all four sites | T4a | NA | D | RE |
| 575 | 570 + 515 Involvement in 570 plus mucosal involvement of anterior tongue or hard palate |
T4a | NA | D | D |
| 600 | OBSOLETE DATA RETAINED V0200 Prevertebral fascia or muscle Soft tissue of neck |
ERROR: | NA | RE | RE |
| 610 | Soft tissue of neck, NOS | T4a | NA | RE | RE |
| 620 | OBSOLETE DATA RETAINED V0200 Nasopharynx, lateral, or NOS |
ERROR: | NA | RE | RE |
| 650 | OBSOLETE DATA RETAINED V0200 Larynx, NOS Medial pterygoid muscle, or pterygoid muscle, NOS Posterior surface of epiglottis |
ERROR: | NA | RE | RE |
| 670 | Maxilla Maxillary sinus (antrum) Nasal cavity Medial pterygoid muscle, Pterygoid muscle, NOS |
T4a | NA | RE | RE |
| 675 | (610 or 670) + (510, 560, or 570) Involvement of any structure in codes 610 or 670 plus any involvement of both lateral walls through soft palate or base of tongue |
T4a | NA | D | RE |
| 678 | (610,670, or 675) + (515, 565, 575) Involvement of any structure in codes 610, 670, and 675 plus mucosal involvement of anterior tongue or hard palate |
T4a | NA | D | D |
| 680 | Deep extrinsic muscles of tongue: Genioglossus Geniohyoid Hyoglossus Mylohyoid Palatoglossus Styloglossus Parotid Gland |
T4a | NA | D | D |
| 685 | Deep soft tissue or musculature of anterior tongue Deep tissue or periosteum of hard palate |
T4a | NA | D | D |
| 690 | Bone excluding base of skull Lateral pterygoid muscle Overlying skin Palatine bone Pterygoid plates Cartilage, NOS Bone, NOS |
T4a | NA | D | D |
| 700 | OBSOLETE DATA RETAINED V0200 Deep extrinsic muscles of tongue: Genioglossus Geniohyoid Hyoglossus Mylohyoid Palatoglossus Styloglossus Hard palate Mandible |
ERROR: | NA | D | D |
| 705 | Stated as T4a with no other information on extension | T4a | NA | L | L |
| 710 | Prevertebral fascia/muscle | T4b | NA | RE | RE |
| 715 | 710 + (510, 560, 670, 675, or 678) Prevertebral fascia/muscle plus any involvement of both lateral walls through soft palate or base of tongue |
T4b | NA | D | RE |
| 718 | 710 + (515, 565, 575, 680, 685, or 690) Prevertebral fascia/muscle plus involvement of any structure in codes 680 and 690 or any involvement of anterior tongue or hard palate |
T4b | NA | D | D |
| 720 | OBSOLETE DATA CONVERTED V0200 See code 690 Lateral pterygoid muscle Pterygoid plates |
ERROR: | ERROR: | ERROR: | ERROR: |
| 750 | Base of skull Bone of skull |
T4b | NA | D | D |
| 760 | OBSOLETE DATA CONVERTED V0200 See code 690 Bone |
ERROR: | ERROR: | ERROR: | ERROR: |
| 770 | Carotid artery (encased) | T4b | NA | D | D |
| 790 | Contiguous extension: Mediastinal structures |
T4b | NA | D | D |
| 800 | OBSOLETE DATA RETAINED V0200 Further contiguous extension: Anterior 2/3 of tongue Parotid gland |
ERROR: | NA | D | D |
| 801 | Further contiguous extension including: 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 |