The Tax Cuts and Jobs Act ended the individual mandate starting in 2019. So for 2018, you’ll be penalized unless you have minimum essential health coverage or qualify for an exemption from coverage. You can find a list of exemptions in the instructions to Form 8965 (https://www.irs.gov/pub/irs-pdf/i8965.pdf).
Loss from an unforeseen and sudden event that is deductible, subject to a 10% income floor and $100 reduction for personal losses.