Advancing Health Savings Act of 2023

This bill amends the tax code to allow individuals to treat medical expenses paid before opening a Health Savings Account (HSA) as qualified expenses, if the HSA is established within 60 days of starting a high-deductible health plan. It directly affects people who set up an HSA shortly after enrolling in a qualifying health plan, making it easier to use HSA funds for prior medical costs. The key provision treats the HSA as if it existed from the start date of their health coverage for expense eligibility purposes. The change applies to health coverage beginning after December 31, 2023. This is a technical adjustment to HSA rules, not a broad policy change.