Recently with some idiots stealing radioactive equipment and those who had been exposed to radiation may not be covered under their medical card.

Below are the exclusion that I found in one of my medical card contract (ALIANZ).

From Zurich Mega Med brochure

Some Exclusion / Limitation from Medical Insurance that you may not know.
Some Exclusion / Limitation from Medical Insurance that you may not know.

If you have older medical card (my 2006 Prudential), you may be covered as Radiation sickness exclusion is not written on contract.

Prudential Medical Card 2006

News Source:
Stolen radioactive material: Health checks advised for Klang apartment residents