trigger InsuranceCheck on Treatment__c (after insert) {

integer count;
for(Treatment__c t:trigger.new){
    count=[select count() from Physician_Insurance__c where Insurance__r.name=:t.insurance__r.name];

    if(count==0)
    {   Physician_Insurance__c pi=new Physician_Insurance__c();
        //pi.name=t.Insurance__r.name;
        pi.Physician__c=t.Patient__r.Primary_Referring_Physician__c;
        pi.Insurance__c=t.insurance__c;
        //pi.PI_ExtID__c=
        insert pi;
    }

    }

}