We have a new patient that presents for further evaluation and consideration of sentinel lymph node biopsy. She underwent a partial mastectomy back in December in another town, however, they do not have the technology for a sentinel lymph node biopsy and she has come to us for a sentinel lymph node biopsy. The doc does an E/M encounter for this and is going to proceed with a sentinal lymph node study in the near future. What would the ICD-9 code be for this visit? Any insight would be greatly appreciated. Thank you in advance.