This article was recently published by my Jurisdiction about the IVR same/similar option, it states it is supposed to pull from CWF and local Jurisdiction records.
https://www.noridianmedicare.com/dme...r_option5.html
One thing I found out today that might be a good tip for future reference, when checking a procedure code for same or similar, there is an option to add a modifier but if you don't know it you can say "no modifier". Well if you decide to state "no modifier" it won't pull accurate information. I checked one today with no modifier and it said there is no SS equipment, then I checked again with NU modifer and with RR modifier added, and it found same/similar equipment on file.