Hi Kimberley -
I'm curious there was a dx of tongue cancer at all? Was this already diagnosed and being re-treated, only to find (thankfully) that there wasn't any evidence of malignancy this time?
I can only assume that the patient already had tongue cancer because how else could the provider put it down as a dx if they didn't already know?
I'd use the 141.9 UNLESS for some odd reason the provider wrote tongue cancer down when the patient never had it, and now for certain doesn't have it.
to be certain though, one would have to see the whole physician note...
{that's my opinion on the posted matter}