CS Extension

This input is used for staging

Notes

**Note 1**: AJCC 7th Edition T1 and T2 categories are based on size and high risk features and not depth of invasion or extension. AJCC 7th Edition includes a T3 category for head and neck skin primaries only. **Note 2**: In the case of multiple simultaneous tumors, code the tumor with the greatest extension. **Note 3**: Skin ulceration does not alter the AJCC T category. **Note 4**: The assignment of the T1 category for cutaneous squamous cell carcinomas with one or no high-risk features is based on tumor size. A physician's statement of the T1 category may be used to code both CS Tumor Size and/or CS Extension if this is the only information in the medical record regarding one or both of these fields. However the two fields are coded independently; for example, the record may document size but not extension. Use codes 510, 520, 600, and 810 as appropriate to code CS Extension based on a statement of T when no other extension information is available. **Note 5**: Use code 400 (Localized, NOS) when no further information is available to assign code 100, 500, 510, or 520.

Default

999

NAACCR Item

NAACCR #2810
Code Description AJCC 7 T AJCC 6 T Summary Stage 1977 T Summary Stage 2000 T
000 In situ, intraepidermal, intraepithelial, noninvasive
Bowen disease
Tis Tis IS IS
100 Lesion(s) confined to dermis Extension Size High Risk Extension Size AJCC6 L L
400 Localized, NOS Extension Size High Risk Extension Size AJCC6 L L
500 Subcutaneous tissue (through entire dermis) Extension Size High Risk Extension Size AJCC6 L L
510 Stated as T1 with no other information on extension Extension Size High Risk Extension Size AJCC6 L L
520 Stated as T2 with no other information on extension T2 T2 L L
550 Underlying cartilage and/or skeletal muscle Extension Size High Risk T4 D RE
600 For skin of head and neck primaries only:
Maxilla
Mandible
Orbital bone
Temporal bone

Stated as T3 with no other information on extension
T3 T4 D RE
700 OBSOLETE DATA RETAINED V0200
Invasion of cartilage, bone, skeletal muscle reclassified in AJCC 7th Edition
See codes 550, 600, 710, and 750

Underlying cartilage, bone, skeletal muscle
ERROR: T4 D RE
710 For skin of head and neck primaries only:
Direct or perineural invasion of skull base
T4 T4 D RE
750 Bone (other than in code 600 or 710):
Axial or appendicular skeleton
T4 T4 D RE
800 Further contiguous extension T4 T4 D D
810 Stated as T4 with no other information on extension T4 T4 D RE
950 No evidence of primary tumor T0 T0 U U
999 Unknown; extension not stated
Primary tumor cannot be assessed
Not documented in patient record
TX TX U U
- For CS Extension codes 100, 400, 500, 510, and 550 ONLY, the T category for AJCC 7 staging is assigned based on the values of CS Tumor Size and CS Site-Specific Factor 12, High Risk Features, as shown in the Extension Size High Risk Table for this schema. - For CS Extension codes 100, 400, 500 and 510 ONLY, the T category for AJCC 6th Edition is assigned based on value of CS Tumor Size as shown in the Extension Size AJCC 6 Table for this schema.