Health insurers use the preapproval process to decide whether a medicine, procedure or service is medically essential. Your plan has its own formulary or listing of approved medicines. This listing also must be a half of the paperwork your insurer supplies to you. You also can name your insurer to find out which medicine are on the list. If you’re making a cashless declare, we don’t need too many paperwork. But, for reimbursement claims, we would require all of your medical invoices along with the declare kind.