EOD Primary Tumor
Notes
**Note 1:** **Multiple simultaneous tumors**
* In the case of multiple simultaneous tumors, code the tumor with the greatest extension.
**Note 2:** **In transit metastases**
* In transit metastasis is defined as a tumor distinct from the primary lesion and located either between the primary lesion and the draining regional lymph node(s) or distal to the primary lesion.
* In transit metastasis with positive lymph node(s) are coded under EOD Regional Nodes.
| Code |
Description |
SS2018 T |
| 000 |
In situ, intraepidermal, intraepithelial, noninvasive |
IS |
| 100 |
Confined to site of origin
* Lesion(s) confined to dermis
* Subcutaneous tissue (through entire dermis)
Localized, NOS |
L |
| 400 |
Direct extension to
- Bone
- Cartilage
- Fascia
- Skeletal muscle |
RE |
| 700 |
Further contiguous extension |
D |
| 800 |
No evidence of primary tumor |
U |
| 999 |
Unknown; extension not stated
Primary tumor cannot be assessed
Not documented in medical record
Death Certificate Only |
U |
(1) Fritz AG, Ries LAG (eds). **SEER Extent of Disease 1988: Codes and Coding Instructions (3rd Edition, 1998)**, National Cancer Institute, NIH Pub. No. 98-2313, Bethesda, MD, 1998
(2) Young JL Jr, Roffers SD, Ries LAG, Fritz AG, Hurlbut AA (eds.). **SEER Summary Staging Manual-2000: Codes and Coding Instructions**, National Cancer Institute, NIH Pub. No. 01-4969, Bethesda, MD, 2001.
(3) Collaborative Stage Work Group of the American Joint Committee on Cancer. **Collaborative Stage Data Collection System User Documentation and Coding Instructions, version 02.05**. American Joint Committee on Cancer (Chicago, IL)
(4) Gress, D.M., Edge, S.B., Gershenwald, J.E., et al. **Principles of Cancer Staging**. In: Amin, M.B., Edge, S.B., Greene, F.L., et al. (Eds.) AJCC Cancer Staging Manual. 8th Ed. New York: Springer; 2017
(5) Bichakjian, C.K., Nghiem, P., Sober, A.J., et al. **Merkel Cell Carcinoma**. In: Amin, M.B., Edge, S.B., Greene, F.L., et al. (Eds.) AJCC Cancer Staging Manual. 8th Ed. New York: Springer; 2017
