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 400 and 440 for extension involving the mucosa only of adjacent sites. Use higher codes for extension involving the 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, 470, or 510. **Note 5**: Use code 470, 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 lamina propria (mucoperiosteum) (stroma) |
ERROR: | NA | L | L |
| 105 | Tumor confined to mucosa of lower gum | T3 | NA | L | L |
| 300 | Localized, NOS | T3 | NA | L | L |
| 400 | Extension involving mucosa only: Buccal mucosa (inner cheek) Floor of mouth Lateral pharyngeal wall Lip, NOS (labial mucosa) Lower lip (labial mucosa) Soft palate including uvula Tongue mucosa Tonsillar pillars and fossae Tonsils |
T3 | NA | RE | RE |
| 440 | Extension involving mucosa only to upper lip (labial mucosa) | T3 | NA | D | RE |
| 470 | Stated as T3 with no other information on extension | T3 | NA | L | L |
| 500 | OBSOLETE DATA RETAINED V0200 Buccal mucosa (inner cheek) Floor of mouth Labial mucosa (inner lip), lip Tongue |
ERROR: | NA | RE | RE |
| 510 | Involvement of deep tissue or periosteum of lower gum | T4a | NA | L | L |
| 520 | 510 + 400 Involvement of deep tissue of lower gum plus mucosal involvement of any structure in code 400 |
T4a | NA | RE | RE |
| 530 | Involvement of deep soft tissue or musculature of any structure in code 400 | T4a | NA | RE | RE |
| 550 | Facial muscle, NOS Subcutaneous soft tissue of face |
T4a | NA | RE | RE |
| 600 | OBSOLETE DATA RETAINED V0200 Lateral pharyngeal wall (tonsillar pillars and fossae, tonsils) |
ERROR: | NA | RE | RE |
| 650 | OBSOLETE DATA RETAINED V0200 Soft palate including uvula |
ERROR: | NA | RE | RE |
| 700 | Cartilage of mandible Cortical bone of mandible Mandible, NOS Cartilage, NOS Cortical bone, NOS Bone, NOS except base of skull, maxilla |
T4a | NA | RE | RE |
| 720 | Extrinsic muscle of tongue: Genioglossus Hyoglossus Palatoglossus Styloglossus |
T4a | NA | RE | RE |
| 725 | (510 -720) + 440 Involvement of any structure in codes 510-720 plus mucosal involvement of upper lip |
T4a | NA | D | RE |
| 730 | Deep soft tissues or musculature of upper lip | T4a | NA | D | RE |
| 760 | Skin of face | T4a | NA | D | D |
| 770 | Cartilage of maxilla Cortical bone of maxilla Maxilla, NOS Maxillary sinus (antrum) |
T4a | NA | D | D |
| 775 | Stated as T4a with no other information on extension | T4a | NA | L | L |
| 790 | OBSOLETE DATA CONVERTED V0200 See Code 800 Skull |
ERROR: | ERROR: | ERROR: | ERROR: |
| 800 | Contiguous extension : Base of skull Carotid artery (encased) Masticator space Pterygoid plates |
T4b | NA | D | D |
| 801 | Further contiguous extension including : Brain Dura Lower cranial nerves (IX, X, XI, XII) Mediastinal structures Prevertebral 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 |