CS Extension

Notes

**Note 1**: Use code 360 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 2**: Use code 300 for localized tumor only if no information is available to assign code 105 or 360.
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 mucosa of one of the following
Frontal sinus
Sphenoid sinus
ERROR: NA L L
105 Tumor confined to mucosa of one of the following:
Frontal sinus
Sphenoid sinus
NA NA L L
300 Localized, NOS NA NA L L
320 Tumor confined to mucosa of more than one accessory sinus NA NA RE RE
330 Tumor confined to mucosa of adjacent structure:
Nasal cavity:
Floor
Lateral wall
Septum
Turbinates
Nasal cavity, NOS
Nasopharynx
NA NA RE RE
340 OBSOLETE DATA CONVERTED V0203
See code 105

Stated as T3 with no other information on extension
ERROR: ERROR: ERROR: ERROR:
360 Involvement of deep soft tissues of single accessory sinus NA NA L L
365 360 +330

Involvement of deep soft tissues of single accessory sinus plus mucosal involvement of any structure in code 330
NA NA RE RE
370 Involvement of deep soft tissues of more than one accessory sinus NA NA RE RE
380 Involvement of deep soft tissues of adjacent structures in code 330 NA NA RE RE
390 Destruction of bony wall of sinus NA NA RE RE
400 OBSOLETE DATA RETAINED V0200

More than one accessory sinus invaded
Destruction of bony wall of sinus
ERROR: NA RE RE
500 OBSOLETE DATA RETAINED V0200

Palate
Nasal cavity, NOS:
Floor
Lateral wall
Septum
Turbinates
ERROR: NA RE RE
550 Involvement of hard palate NA NA RE RE
600 Bone, cartilage:
Facial bones
Maxilla
Orbital structures
Pterygoid fossa
Zygoma
NA NA RE RE
650 Anterior orbital contents
Skin of nose
Skin of cheek
Muscles:
Masseter
Pterygoid
NA NA RE RE
700 OBSOLETE DATA RETAINED V0200

Brain
Cranial nerves
Muscles:
Masseter
Pterygoid
Nasopharynx
Orbital contents, including eye
Soft tissue
Skin
ERROR: NA RE RE
725 OBSOLETE DATA CONVERTED V0203
See code 360

Stated as T4a with no other information on extension
ERROR: ERROR: ERROR: ERROR:
750 Anterior cranial fossa
Base of skull
Clivus
Cribriform plate
Middle cranial fossa
NA NA RE RE
790 Contiguous extension:
Brain
Lower cranial nerves (IX, X, XI, XII)
Dura
Middle cranial fossa
Orbital apex
NA NA RE RE
800 OBSOLETE DATA RETAINED V0200

Further contiguous extension
ERROR: NA D D
801 OBSOLETE DATA REVIEWED V0203
See codes 790, 805

Further contiguous extension:
Brain
Dura
Lower cranial nerves (IX, X, XI, XII)
Prevertebral space
Mediastinal structures
NA NA D D
805 Further contiguous extension:
Carotid artery (encased)
Masticator space
Mediastinal structures
Prevertebral space
NA NA D D
810 OBSOLETE DATA CONVERTED V0203
See code 750

Stated as T4b with no other information on extension
ERROR: ERROR: ERROR: ERROR:
815 OBSOLETE DATA CONVERTED V0203
See code 360

Stated as T4 NOS with no other information on extension
ERROR: ERROR: ERROR: ERROR:
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