In the United States, a high-deductible health plan (HDHP) is a health insurance plan with lower premiums and higher deductibles than a traditional health plan. It is intended to incentivize consumer-driven healthcare. Being covered by an HDHP is also a requirement for having a health savings account.[1] Some HDHP plans also offer additional "wellness" benefits, provided before a deductible is paid. High-deductible health plans are a form of catastrophic coverage, intended to cover for catastrophic illnesses.[2] Adoption rates of HDHPs have been growing since their inception in 2004, not only with increasing employer options, but also increasing government options.[3] As of 2016, HDHPs represented 29% of the total covered workers in the United States; however, the impact of such benefit design is not widely understood.[4][5]