You will be asked to submit proof of Czech health insurance when you apply for your visa. For detailed information please refer to the Ministry of the Interior: http://www.mvcr.cz/mvcren/article/third-country-nationals-application-requirements-travel-medical-insurance-during-a-stay-longer-than-90-days.aspx
Students may apply online and receive their documents anywhere in the world. Companies usually offer student discounts to students ages 17-26. The following are some recommended insurance companies:
Students can of course use medical services in both emergency and non-emergency cases. A valid insurance card is required when going to a doctor or a medical facility in the Czech Republic. EU nationals should provide European Health Insurance Card.
The Czech Republic uses the European emergency number 112.