EOD Primary Tumor

Notes

**Note 1:** Deep invasion (code 300) is defined as either invasion beyond the subcutaneous fat, or >6 mm deep (as measured from the granular layer of adjacent normal epidermis to the base of the tumor). **Note 2:** In the case of multiple simultaneous tumors, code the tumor with the greatest extension. **Note 3:** Skin ulceration does not alter the classification.
Code Description SS2018 T
000 Carcinoma in situ IS
100 Lesion(s) confined to dermis Subcutaneous tissue (through entire dermis) L
300 Bone erosion (minor or NOS) Deep invasion - Skeletal muscle - Underlying cartilage Perineural invasion RE
400 Maxilla Mandible Orbital bone Temporal bone RE
500 Gross cortical bone/marrow RE
600 Skull base invasion Skull base foramen RE
700 Further contiguous extension D
999 Unknown; extension not stated Primary tumor cannot be assessed Not documented in patient record Death Certificate Only U
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