Most specialist can be visited ONLY with a referral that you get after consulting with your GP.
On the other hand, you can directly approach the following specialists with no referral:

• Ear-nose-throat specialists
• Ophthalmologists
• Urologists
• Gynecologists
• Surgery
• Lung screening once a year if your age is above 40
• Dermatologists

These specialists are mostly located in one central state clinic in each district. Regardless of having a referral or not, you need to make an appointment, which can do on the phone(though there is a chance they won’t speak English), or personally at the reception desk. We recommend visiting the reception personally, as there is always at least one English-speaking staff there, and they need to register some of your personal details data. To book an appointment, you will always need your TAJ-card, residence permit and your addresscard, plus the referral from the GP, if necessary.

District 6 and 7:  Terézvárosi Egészségügyi Szolgálat (TESZ): 1074 Budapest, Csengery u. 25. (http://tesz.co.hu)