Who do I call for insurance coverage on billable items?

Start with your primary insurance company.  The number for customer service will be located on your insurance card.  If your primary does not cover your item, call your secondary, tertiary, etc.

Find out if the item(s) you medically need (have a current prescription for) are a covered benefit under your insurance plan.

If the items are covered under your insurance plan, find out how many you are allowed per year and how many you are allowed at a time.  (Quantity/Frequency)