i am working in ajman. As my employer said he will...

We would like to inform you that the National Health Insurance Company "Daman" issued three types of health insurance documents for those coming to the state, according to the visit visa, by adopting three types of health cards for this category, which are short visit visas valid for 30 days at a price of 40 dirhams, and the second at 70 dirhams for 60 One day and 90 dirhams for a visa valid for 90 days.
“The health insurance policy is canceled upon the expiry of the visa period, and the company is not obligated to cover any medical services after the expiry of the visa period

Yes, insurance is compulsory for the employer