Sucking out mucous does not qualify for tissue. Also opening up the antrum, as in an antrostomy (opening the maxillary sinus opening for drainage) is not removal of tissue, because that is what 31256 is. Removal of anything else, polyps in the maxillary sinus, any crusts, or mucousa (note the "a" at the end of that word) from inside the maxillary sinus qualifies for tissue, and thus 31267. I hope that helps.
Barbara J. Cobuzzi, CPC, CENTC
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