Treatment (Set 1)
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(Reference: SEER Program Coding and Staging Manual 2004 (PDF), pgs 169-201 and Appendix C for Surgery of Primary Site codes; FORDS Manual (PDF), pgs 129-191 and Appendix B for Surgery of Primary Site codes.)
The first cancer-directed therapy (treatment given in an attempt to destroy or modify cancer tissue) was surgery
Biopsy of primary tumor followed by a gross excision of the lesion (does not have to be done under the same anesthesia). If the procedure is stated to be a wide excision or reexcision, but the margins are unknown, code to 30. If the excision does not have microscopically negative margins greater than 1 cm, use the appropriate code 20-36.
Code the most extensive surgery if the patient has multiple surgical procedures of the primary site.
Sentinel lymph node biopsy
Surgery of the primary site was performed. (Excision of right lower back lesion)