CS Extension

Notes

**Note 1**: In the case of multiple simultaneous tumors, code the tumor with the greatest extension. **Note 2**: Skin ulceration does not alter the AJCC T category. **Note 3**: In-transit metastasis is coded in CS Lymph Nodes. **Note 4**: The assignment of the T1, T2, and T3 categories for Merkel cell carcinomas is based on tumor size. A physician's statement of the T 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 600, 610, 620, and 810 as appropriate to code CS Extension based on a statement of T when no other extension information is available.
Code Description AJCC 7 T AJCC 6 T Summary Stage 1977 T Summary Stage 2000 T
000 In situ, intraepidermal, intraepithelial, noninvasive Tis Tis IS IS
100 Lesion(s) confined to dermis Extension Size Extension Size L L
400 Localized, NOS Extension Size Extension Size L L
500 Subcutaneous tissue (through entire dermis) Extension Size Extension Size L L
600 Stated as T1 with no other information on extension Extension Size Extension Size L L
610 Stated as T2 with no other information on extension Extension Size Extension Size L L
620 Stated as T3 with no other information on extension Extension Size Extension Size L L
680 Fascia T4 T4 D RE
700 Underlying cartilage, bone, skeletal muscle 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 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, 500, 600, 610, and 620 ONLY, the T category for AJCC 7 staging is assigned based on the value of CS Tumor Size as shown in the Extension Size Table for this schema. - For CS Extension codes 100, 400, 500, 600, 610, and 620 ONLY, the T category for AJCC 6 staging is assigned based on the value of CS Tumor Size as shown in the Extension Size Table for this schema.