Insurance is big business in the Netherlands. Apart from the basic government insurance, there are a number of other private medical insurance providers who offer a range of insurance coverage options.
In order to work, study or simply travel, you will always need a good international health insurance with experience to cover you, whatever is the length of your expatriation in Amsterdam and the Netherlands.
Expats that are living and/or working in the Netherlands are usually required to take out basic Dutch health insurance to cover the costs of (unexpected) medical care, such as consulting a General Practitioner (GP), medication and hospital treatment. More information can be found on:
http://www.zorgwijzer.nl/faq/expats