I retired from Megacorp on 8/31/18. I rolled over my HSA account to our personal bank as the megacorp provider was going to charge me $3.95 a month to keep it there, and my bank will charge us $0.
Today I received an "ineligible notice" from our HSA saying that some blood work was paid for from our LIMITED PURPOSE FSA (can only be used for dental & vision), and I need to pay the $44 back. The date of service for this was
May of 2016.
Problem is, I have no account with that megacorp HSA/FSA provider now. The letter also says if I don't pay it back, they'll send me a form stating that $44 is taxable income.
At this point I'm willing to take the tax hit

rather than sending them $44 which will just float around in their Ether.
Anything I'm missing here?