Health Insurance

Hey there ,
I was wondering if anyone of you knows how health Insurance for non-EU foreign Students Works in Czech Republic . I am thinking of doing my masters in prague but unfortunately I have an allergy condition which requires treatment.  The amazing German insurance i have now(living in Berlin currently ) covers almost everything and I am worried if it will be the same in Prague Too.  So my question is: Are preexisting conditions at all covered from insurances and if yes to What extent . What Insurance Type would you recommend to me ? And how are the healtchare facilities in general and when it comes to allergy specialists and treatment?
Thanks in advance

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