After multiple mammograms and a core biopsy with a diagnosis of hyperplasia and precancerous papilloma, i have been told to go to a surgeon. why?

Prevent cancer: It is generally advisable to have the precancerous papilloma removed so that it doesn't have a chance to develop into cancer.

With those results: on core biopsy, the usual recommendation is surgical excision. A core biopsy only provides samples of an area, it doesn't remove it entirely. When the core biopsy result is a complex or atypical papilloma, at surgery some of these will be "upgraded" to a malignancy once the pathologist has the entire area to analyze, so they should be removed surgically.