Can someone please explain to me paying for a Dr visit? (USA) oo

I have an appointment tomorrow and this is one of the first visits I will be going to by myself. This is my first time going to this Dr (new family dr) and I went online to figure out how much I will have to pay (I logged in using my insurance info, so this is based on my plan).

I have a health condition and I need to be referred to a specialist. That's what this appointment is for and there's something else I want to bring up as well.

This is what it shows for the Dr I will be seeing. Can someone explain what the difference is between the highlighted purple areas? And maybe help me figure out which one my appointment is? Why would my insurance cover one and not the other? Also, what does the highlighted red area mean?

If I do have to pay, do I have to pay tomorrow at my appointment? Or will they bill me?

UPDATE: I did not pay anything and they did not mention anything about sending me a bill or how much I owe. The Dr wrote me a prescription and had me get blood work done as well. I'm so confused about all this.

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