CS Extension

Notes

**Note 1**: AJCC does not include a Tis or TX category for melanoma of mucosa of head and neck sites. CSExtension 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 310 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 300 for localized tumor only if no information is available to assign code 105, 205, 250, 440, or 510. **Note 5**: Use code 440, 725, 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:
Inferior wall (superior surface of soft palate)
One lateral wall
Posterior superior wall (vault)
ERROR: NA L L
105 Tumor involving mucosa only of one of the following subsites:
Inferior wall (superior surface of soft palate)
One lateral wall
Posterior superior wall (vault)
T3 NA L L
200 OBSOLETE DATA RETAINED V0200

Involvement of two or more subsites:
Lateral wall extending into eustachian tube/middle ear
Posterior, inferior, or lateral wall(s)
ERROR: NA L L
205 Tumor involving mucosa only of two or more subsites:
Lateral wall extending into Eustachian tube/middle ear
Posterior, inferior, or lateral wall(s)
T3 NA L L
250 Tumor involving mucosa only of nasopharynx, NOS T3 NA L L
300 OBSOLETE DATA RETAINED V0200

Confined to nasopharynx
Localized, NOS
T3 NA L L
305 Localized, NOS T3 NA L L
310 Tumor involving mucosa only:
Nasal cavity
Oropharynx
Soft palate including uvula
T3 NA RE RE
315 Tumor involving mucosa only:
Hard palate
Paranasal sinus
T3 NA D RE
400 OBSOLETE DATA RETAINED V0200

Oropharynx
Soft palate,
ERROR: NA RE RE
440 Stated as T3 with no other information on extension T3 NA L L
500 OBSOLETE DATA RETAINED V0200

Nasal cavity
ERROR: NA RE RE
510 Involvement of deep soft tissues or musculature of any structure in code 105 or 250 T4a NA L L
515 510 + 310

Involvement of deep soft tissues or musculature of any structure in code 105 or 250 plus involvement of mucosa of any structure in code 310
T4a NA RE RE
520 OBSOLETE DATA CONVERTED V0203
See code 545

510 + 315

(Involvement of deep soft tissues or musculature of any structure in code 105, 205, or 250 + Involvement of mucosa of any structure in code 315)
ERROR: ERROR: ERROR: ERROR:
530 Involvement of deep soft tissues or musculature of any structure in code 310 T4a NA RE RE
535 Involvement of any structure in codes 105 to 310
WITH tumor described as FIXED
T4a NA RE RE
540 Involvement of any structure in codes 105 to 310
WITH parapharyngeal extension
T4a NA RE RE
545 (510 - 540) + 315

Involvement of deep soft tissues or musculature of any structure in codes 510 - 540 with involvement of mucosa of any structure in code 315
T4a NA D RE
550 OBSOLETE DATA RETAINED V0200

Any extension coded in 100-500 WITH fixation or tumor
Described only as FIXED
ERROR: NA RE RE
555 Bony involvement of any structure in code 315 T4a NA D RE
560 OBSOLETE DATA RETAINED V0200

Any extension coded in 100-500 WITH parapharyngeal extension
ERROR: NA RE RE
570 OBSOLETE DATA RETAINED V0200

Hard palate
ERROR: NA D RE
580 Pterygopalatine fossa
WITHOUT bone invasion
T4a NA RE RE
600 OBSOLETE DATA RETAINED V0200

Bone, including Skull
ERROR: NA RE RE
610 Bone excluding base of skull
Cartilage, NOS
Bone, NOS
T4a NA RE RE
620 OBSOLETE DATA RETAINED V0200

Paranasal sinus
ERROR: NA D RE
630 (580 or 610) + (315 or 555)

Involvement of any structure in code 580 or 610 plus any involvement of structures in code 315
T4a NA D RE
650 OBSOLETE DATA REVIEWED AND CHANGED V0200
In CSv1 extension to the orbit was included in both codes 650 and 700. In addition the instructions for coding invasion of orbital bone were not clear. Codes 650 and 700 should be reviewed for orbital involvement. Involvement of bone of floor of orbit should be coded 760, and other orbit involvement should be coded 790.

Orbit
ERROR: ERROR: ERROR: ERROR:
670 Hypopharynx
Overlying skin
Soft tissues of neck
T4a NA D D
700 OBSOLETE DATA REVIEWED AND CHANGED V0200
See note in code 650

Brain
Cranial nerves
Hypopharynx
Infratemporal fossa
Orbit
Intracranial extension, NOS
ERROR: ERROR: ERROR: ERROR:
710 OBSOLETE DATA REVIEWED AND CHANGED V0203
Code 710 included in error in CSv2: V0200, V0202 with the tag OBSOLETE DATA RETAINED V0200. Code 710 should not be entered on any case. See note in code 650; see codes 670, 760, 790.

Brain
Cranial nerves
Hypopharynx
Infratemporal fossa
Orbit
Intracranial extension, NOS
ERROR: ERROR: ERROR: ERROR:
725 Stated as T4a with no other information on extension T4a NA L L
750 OBSOLETE DATA CONVERTED V0200
See code 790

Masticator space
ERROR: ERROR: ERROR: ERROR:
760 Skull base including floor of orbit T4b NA RE RE
765 760 + (315, 555)

Base of skull including floor of orbit plus any involvement of structures in code 315 or 555
T4b NA D RE
770 760 + 670

Base of skull including floor or orbit plus any involvement of structures in code 670
T4b NA D D
790 Contiguous extension:
Brain
Dura
Intracranial extension, NOS
Lower cranial nerves (IX, X, XI, XII)
Masticator space/infratemporal fossa
Orbit
T4b NA D D
800 OBSOLETE DATA RETAINED V0200

Further contiguous extension
Soft tissues of the neck
ERROR: NA D D
801 Further contiguous extension:
Carotid artery (encased)
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