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Have a complaint about ONVZ?
Let us know!

We do our best to serve you as well as possible. Despite this, you may be unhappy or disagree with a decision we have made. Your options in such cases are explained below.

File a complaint

If you disagree with a decision we have made, or you are dissatisfied with our services or the way we handle your personal data, you can file a complaint in one of the following ways:

  • use our special complaint form
  • send a letter to the following address:



    Postbus 392

    3990 GD Houten

    The Netherlands

Complaint about ONVZ forms

If you have a complaint about our forms being overly complicated or unnecessary, please let us know. If you are dissatisfied with our response, you can also file your complaint with the Nederlandse Zorgautoriteit (Dutch Health-Care Authority, NZa).

Nederlandse Zorgautoriteit

T.a.v. de Informatielijn/het Meldpunt

Postbus 3017

3502 GA Utrecht

The Netherlands

+31 (0)88 770 87 70

How we handle your complaint

You will receive confirmation once we have received your complaint and we will process your complaint within 15 working days of receipt. If we need more time, we will notify you.

Not satisfied with our response?

We aim to handle your complaint with care. However, you may not agree with our response or decision. In that case, you can contact the complaints and disputes committee Stichting Klachten en Geschillen Zorgverzekeringen.

Complaint about your health-care provider

If you are dissatisfied with your health-care provider, let them know.

We are here whenever you need us

  • Direct personal contact

    Monday to Friday from 8.30 a.m. to 6.00 p.m

    030 639 62 22

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