CS Extension

Notes

**Note 1**: In the case of multiple simultaneous tumors, code the tumor with greatest extension. **Note 2**: Skin ulceration does not alter the AJCC T category. **Note 3**: Presence of tumor at eyelid margin takes priority over depth of invasion in dermis/tarsal plate; i.e., code 250 takes priority over codes 100-200. **Note 4**: Metastatic skin lesions are coded in CS Mets at DX.
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
Minimal infiltration of dermis
(Not invading tarsal plate, not at eyelid margin)		 Determine Correct Table for T Determine Correct Table for T L L
150 Subcutaneous tissue
(Through entire dermis, not invading tarsal plate, not at eyelid margin)		 Determine Correct Table for T Determine Correct Table for T L L
155 Stated as T1 with no other information on extension Determine Correct Table for T Determine Correct Table for T L L
200 Tumor invades tarsal plate, not at eyelid margin Determine Correct Table for T Determine Correct Table for T L L
250 Tumor at eyelid margin Determine Correct Table for T Determine Correct Table for T L L
270 Stated as T2a with no other information on extension Determine Correct Table for T Determine Correct Table for T L L
300 Tumor involves full eyelid thickness Determine Correct Table for T Determine Correct Table for T L L
320 Stated as T2b with no other information on extension Determine Correct Table for T Determine Correct Table for T L L
340 Stated as T2 [NOS] with no other information on extension Determine Correct Table for T Determine Correct Table for T L L
400 Localized, NOS Determine Correct Table for T Determine Correct Table for T L L
500 OBSOLETE DATA CONVERTED V0200
See code 150

Subcutaneous tissue (through entire dermis)		 ERROR: ERROR: ERROR: ERROR:
600 OBSOLETE DATA RETAINED V0200
See code 010, CS Site-Specific Factor 6 for perineural space involvement

Adjacent structures, including:
Bulbar conjunctiva
Globe
Perineural space
Sclera
Soft tissues of orbit		 ERROR: T4 D RE
610 Adjacent structures, including:
Bulbar conjunctiva
Globe
Sclera
Soft tissues of orbit		 T3a T4 D RE
620 Bone/periosteum of orbit
Skeletal muscle
Underlying cartilage		 T3a T4 D RE
650 Stated as T3a with no other information on extension T3a T3 D RE
670 Complete resection requires enucleation, exenteration, or bone resection

Stated as T3b with no other information on extension		 T3b T4 D RE
690 Stated as T3 [NOS] with no other information on extension T3NOS T4 D RE
700 OBSOLETE DATA CONVERTED V0200
See code 620

Bone/periosteum of orbit
Skeletal muscle
Underlying cartilage		 ERROR: ERROR: ERROR: ERROR:
715 Tumor unresectable, extensive invasion:
Ocular structures
Orbital structures		 T4 T4 D RE
720 Nasal cavity
Paranasal sinuses
Other craniofacial structures		 T4 T4 D D
740 Central nervous system T4 T4 D D
750 OBSOLETE DATA CONVERTED V0200
See CS Extension Code 999 and CS Mets at DX codes 20, 30, 55, 58

Metastatic skin lesion(s)		 ERROR: ERROR: ERROR: ERROR:
800 Further contiguous extension T4 T4 D D
810 Stated as T4 with no other information on extension T4 T4 D D
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 ONLY, the T category for AJCC 7 staging is assigned based on the value of CS Tumor Size, CS Extension, and Perineural Invasion recorded in CS Site-Specific Factor 6, as shown in the Extension Size, Perineural Invasion Negative or Unknown AJCC 7 Table, the Extension Size, Perineural Invasion Positive AJCC 7 Table, and the Extension Size, Perineural Invasion 888, 988 Table for this schema. - For cases coded in CSv1 (CS Version Input Original equals 01XXXX) and Year of Diagnosis is less than 2010 and CS-Site Specific Factor 6, Perineural Invasion = 988 or blank, the T category for AJCC 6 staging is assigned based on the value of CS Tumor Size and CS Extension as shown in the Extension Size AJCC 6 Table CSv1 for this schema. For cases coded in CSv2 and cases coded in CSv1 with Year of Diagnosis less than 2010 and Perineural Invasion not coded to 988 or blank, using CS Extension codes 100-400 ONLY, the T category for AJCC 6 staging is assigned based on the value of CS Tumor Size, CS Extension, and Perineural Invasion recorded in CS Site-Specific Factor 6, as shown in the Extension Size, Perineural Invasion Negative or Unknown AJCC 6 Table CSv2, the Extension Size, Perineural Invasion Positive AJCC 6 Table CSv2, and the Extension Size, Perineural Invasion 888, 988 Table CSv2 for this schema.