If you have any type of Tavel insurance, first you need to cancel with NCL, you will get a cancel confirm along with the taxes, port fees, dining and/or drinking packages, excursions purchased, showing those will be refunded. Sounds like you might not have travel insurance. If you do, to submit a claim you will need original cruise invoice, cancel invoice, trip cancellation policy, itinerary, and if for medical, physicians statement. Don't let it ride, NCL will not contact you for a no show. Unless you have cancelled for no reason with NCL you won't get any FCC, unless someone special reaches out. You should get your refund for the above charges within 10 days.