Yes, health insurance is mandatory for the Estonia Digital Nomad Visa (DNV). You must have a valid medical insurance policy with a minimum coverage of €30,000 to apply for a digital nomad visa in Estonia. You can use this medical coverage throughout your stay in Estonia for any medical treatments or emergencies. You may also qualify for Estonia's public health insurance (Haigekassa) if you reside in the country for a qualifying period of time, during which you will be required to use your private medical insurance.