The government ensures that insurance providers give the same basic level of service in their packages. There can be changes to the amount of coverage. This means you need to look at the list every so often to see what is and isn’t covered. The contents of the basic care package (basispakket) can be found on the government website.
Visiting a family doctor, for example, is included in the coverage of basic health care in the Netherlands. If you are not insured in the Netherlands you will be asked to pay up front and then claim the money back from your own health insurance.
If you want to see whether a specific medicine is covered by your basic insurance (or how much it costs if not), you can use the website medicijnkosten.nl. The website is made by the Dutch government to list the average price of most medications.