In any case: You are obligated to have health insurance.
There are three types of health insurance. Which type is applicable depends on your personal situation.
The Dutch public health insurance ("zorgverzekering") is mandatory for students that fulfill one of the following conditions:
If you don’t fulfill these conditions you are not eligible for this insurance.
This card is eligible only in case you fulfill three conditions:
You can remain insured with the health insurance in your home country.
All other students are obligated to choose a different health insurance. This will in most cases be your pre-existing insurance. You need to make sure that it covers your stay in the Netherlands.
Find out more about costs and financing of studies