Change in doctor's site

I received a letter from NorthShore University HealthSystems saying that my primary physician, in Skokie, was changing to a new "site". My doctor says he's not physically moving anywhere, that site is some form of accounting number, and I need to check with my insurance to know what it means.  I believe my insurance card says my current "site" is 284. What is a site and does this matter?

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