If you require immediate medical attention, you can call 112. Dialing this number will direct you to the emergency services that will forward you to the appropriate department depending on your emergency: Police, fire department, ambulance.
The basic Dutch healthcare insurance usually covers the costs related to the emergency and the ambulance that will offer first aid and transportation to the hospital etc. However, if you do not have an insurance, you will have to take care of these costs yourself.
If your case is non-life threatening, you can wait to book an appointment with your GP at the earliest convenience or the “Huisartsen post” which is a GP office that works irregular hours. The GP will then assess the situation and see if it is necessary for you to visit the hospital.
Once you are referred and you turn up at the hospital for the first time, go to the desk and register with them. They will need all your personal details and your GP’s name and address. You will be given a little plastic folder with all your information — you will need to take this with you every single time you go.