If you take on work for an employer in another country than Norway, you will, as a general rule, cease to be a member of the Norwegian National Insurance Scheme. This means you will not be entitled to reimbursement for your healthcare services expenses from the Norwegian National Insurance Scheme. You must, therefore, check whether you are covered by a national insurance scheme in the country where you work to have healthcare expenses covered there.
There are some exceptions where you can keep your membership in the National Insurance Scheme. You can read more about this on the page 'Working in the EEA or Switzerland' (nav.no) (in Norwegian only).
If you are considered a resident of Norway and are covered by the social security scheme of the country where you work, you may be entitled to an S1 certificate from your country of employment. The S1 certificate documents your right to coverage of healthcare expenses received in Norway.
The S1 certificate is not used within the Nordic region. If you work in another Nordic country and live in Norway, you will keep your health rights in Norway without having an S1 certificate.
If you are not covered by the Norwegian National Insurance Scheme or a social security scheme in you work country, you should consider taking out private insurance. This is important in case you need healthcare.
Example
​Johan wants to live in Italy. He gets a job as a bartender in Rome and moves there to start work. This means he is no longer a member of the Norwegian National Insurance Scheme and will, therefore, not be entitled to social security benefits from Norway while he is working in Italy. Johan must find out whether he is covered by the Italian national insurance scheme.