Need CPT for FDL tendon release

Agree, these are not the same thing. If it was a transfer they would have said transfer. Also, depending on where and what other procedures were done at the same time it can alter the coding choices/bundling issues with foot/ankle.
Tenotomy, Tenolysis, Transfer. All different.
That is a good article above.
These are good learning webinars:
The coding coach articles here for ortho are good too:
The AAOS public site has really good information for learning: (example)
This reference can help if you have to do a lot of foot & ankle:
Sometimes you can find topics here too: