E/M code

My question is two fold.The provider I work with wants to bill when she calls or writes a letter to the patient with lab results. The only code I could find is for non-face-to-face services 99441-99443. She has also asked if you can charge an office visit when she writes a letter.

I am under the impression that the lab follow up would be considered part of the office visit when the labs were ordered. I could be wrong.

If it is possible to bill for the lab reviews do I have the right codes?

Thank You

E/M code