Private insurance
If you are younger than 30, or if you are older than 30 but staying in the Netherlands for less than a year, and you are not employed, private healthcare agreements for international students will suffice for you. If not, you must choose a basic healthcare insurance at the start of your studies in order not to be fined.
Several private insurance companies such as Aon Consulting (see link below) offer similar products covering medical expenses, accidents, luggage, general liability and legal assistance in the event of physical injury.
Basisverzekering
The Dutch basisverzekering, or basic healthcare insurance, is compulsory for Dutch citizens. International students aged 30 and older who are planning to stay in the Netherlands for one year or longer are obliged under Dutch law to take out this basic healthcare insurance. Furthermore, from the moment you start a (part-time) job, you will have to take out basic healthcare insurance, even if you are an EU citizen and are covered by an EU health insurance card.
Dutch basic healthcare insurance is more expensive than private insurance, costing around € 1,100 a year. This might be more expensive than your current insurance. Keep this in mind if you want to seek employment in the Netherlands in addition to studying. The cost of basic healthcare insurance may make working less worthwhile as you would merely be working to pay your insurance.