[nradov]

Some doctors have been concerned that patients lack the education needed to interpret their own charts. So when patients don't understand something they call back and ask a lot of questions, which doctors see as a waste of time. (I don't agree with this perspective, just giving some context.)

[hopler]

In the US that's fine, because the doctor can bill for the follow-up consultation.

[nradov]

Answering questions over the phone is usually not billable.