“Whether a refinancing has occurred is determined by reference to whether the original obligation has been satisfied or extinguished and replaced by a new obligation, based on the parties’ contract and applicable law.”
If you aren’t replacing the original note with a new note or if you aren’t adding a variable rate feature to an account that didn’t have one, you could consider it a modification. Take a look at 1026.20(a) and its commentary before you make a decision on whether you have a refinancing or modification.