A Limited-purpose Flexible Spending Account (LPFSA) is designed specifically for HDHP participants who contribute to an HSA. To prevent disqualifying your HSA, an LPFSA is legally restricted to paying for qualified dental and vision expenses only. Once you satisfy your primary HDHP deductible, the LPFSA can convert to a post-deductible FSA, covering general medical expenses. The LPFSA shares the same $3,400 contribution cap, strict use-it-or-lose-it rules, and $680 rollover limits as the MedFSA.