Can I fund and use my HSA to pay for last year's expense?

Hi, 

I had a HDHP health plan in 2014 which included a HSA account. At the end of 2014 I had around $50 remaining. 

 

From  2015-2021 I had traditional health insurance which did not include an HSA. I did not touch the $50 remaining in my HSA account. For 2022 I have re-enrolled in a HDHP health plan with a HSA account. I now have two HSA accounts. The old one ($50) and the new one. 

 

At the end of 2021, we had a major medical event resulting in a $6k bill. Can I partially fund my old HSA today and use it towards the medical bill? I did search online and I kept seeing "As long as the HSA was established before you incurred the medical expense, an HSA can be used to reimburse that expense years later." Does the gap from 2015-2021 when I was ineligible for a HSA matter?

 

Thanks.