Who called from 4156000998

Got a call from this number. The call dropped when I answered.

It's California Pacific Medical Center.  Most likely from Radiation Oncology.

I got a call from this number as well. The person on the other end hung up when I said, "Hello"

They called my cell four times consecutively this morning.  They did not leave a message, nor did I answer.  It is a land-line based in San Francisco.

I got a call from them as well. It rang twice and when I answered they hung up.  Then I got a call from 415-563-4321 also CA Pacific Medical Center which someone actually spoke.