Yes, but the terms of your policy probably clearly state that the insurance companies decision is final and binding. So to get another opinion would probably be futile.
Every insurance co has a procedure to dispute their appraisal.Most use ccc(outside co) to come up with the amount.ccc's job is to come up with the least money so that they can continue business with insurance companies.The insured should hire a licensed appraiser to challenge the insurance co.Your appraiser will most likely get you more money.