Yes some people say that after 6 months of neuromodulation therapy their tinnitus was completely gone. I started listening to it as a background sound almost all the time now when I am in a closed space, so hope mine will be gone in a couple of months.
You might be able to find the frequency that you lost, which is probably the frequency of your tinnitus. You can do the hearing test, and see where is the gap on the audiogram. Alternatively, play the scale of frequencies 20Hz-20000Hz and see if you can spot any gaps that you can not hear. You may need to play with the volume. If you don't have any gaps probably the frequency of your tinnitus is the highest one you can hear, i.e. this is where your hair cells started to die for some reason, and you should use that frequency for neuromodulation therapy.
http://www.szynalski.com/tone-generator/