EOD Primary Tumor
Notes
**Note 1:** In the case of multiple simultaneous tumors, code the tumor with the greatest extension.
**Note 2:** 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 patient 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: 3-30
(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: 549-562
