Is it okay to causally visit someone at their office in American work culture?

Posted by clumsy_engineer@reddit | AskAnAmerican | View on Reddit | 178 comments

They are a friend of mine who I basically met through my professional work. We are both medical doctors. They are slightly my senior and we helped each other considerably related to our work. We tend to bring each other small gifts when we meet at conferences or meetings. I will be visiting their city for a conference. I would like to visit them at their office if they are available. I will of course ask if they have available time during my visit. As you might have guessed, I am pretty unfamiliar with American work culture, so I would appreciate any comments.