Call your doctor first and consult with them, if it is necessary for you to come in person. If you need to see a doctor in person. Try to avoid places with an increased risk of infection.
If possible, travel by car or call a taxi. Only stay in the waiting room for the necessary time and keep the distances between other patients.
Of course, cover your mouth and nose with a face mask. Avoid touching objects that have been touched by patients before you (such as handles, railings).
However, do not underestimate the importance of preventive health checkups!