Please bear in mind that the level of public medical services in Poland is very poor. Lower staff, such as receptionists do not speak English and you'll have to stand in long lines to get to a doctor. You may also learn that desired doctor is not available at the moment.
Fun Alternatives: Should you need to go to a doctor please call one of private clinics. I personally prefere Centrum Medyczne - Medical Center in Warsaw where you'll receive all necessary treatment on a good level. The bad thing about private clinics is that you have to pay.
Please check http://www.cm-lim.com.pl to learn more about Medical Center.