Yes. For 2024, you can contribute an additional $3150 (on top of the employer contribution), and then withdraw it immediately to pay the bill (or to reimburse yourself if you already paid the bill), and the contribution will be tax-deductible. You can do the same for 2025. The only requirement is that the medical procedure must occur after the HSA is opened (which it will).
Let me add that I recommend that you contribute the maximum amount to the HSA every year, even if you don't have planned medical expenses. In many ways, an HSA is a better way to save for retirement than an IRA. With an IRA, you get a tax deduction for your contributions, and you pay tax when you withdraw. With an HSA, you get a tax deduction for your contributions. Then, if you withdraw the funds for medical expenses, it is completely tax-free, and that includes medicare premiums and prescriptions after you retire. Plus, over age 65, you can withdraw the money for any reason and only pay regular income tax with no penalties. So it's like an IRA but with a tax-free option for medical expenses. I would recommend you maximize your HSA contributions before maximizing your IRA contributions, as long as you are eligible.
