The best way to find out if your insurance will cover Botox for your migraines is to contact them or your HR representative to see if it is a covered benefit. If it is they can also help you find injectors in your area that are in your network.
Insurance coverage for migraines will vary by carrier. The best way to find limitations and better understand coverage is to contact your carrier or HR representative for assistance. They can also provide the names of injectors in your area who are in your network.
What is done with the remaining Botox is a question only your doctor can answer. Once reconstituted the product can be used for up to 24 hours, longer in some situations if stored properly. Your should only be charged for the units that were injected.
Read 3 Doctor Answers
Recommended reading
Everything you need to know about Botox for Migraines