Nasal endoscopy vs Laryn/Broncoscopy endoscopy
"For endoscopy procedure, code approprite endoscopy, of each anatomical site examined."CPT 2011, pg. 112.
I'm not sure what the principal diagnosis is for your son, and I hope he is feeling better. And I am probably incorrect, but isn't the physician evaluating 3 different anatomical sites. The sinuses, the larynx, and the bronchi?
31231- Nasal endoscopy, diagnostic, unilateral or bilateral (separate procedure)
"for diagnostic evaluation refer to employing a nasal/sinus endoscope to inspect the interior of the nasal cavity and the middle and superior meatus, the turbinates, and the speno-ethmoid recess." CPT 2011, pg,109
Could this mean that the physician went up the nose, into the paranasal sinuses to look and inspect the first anatomical site: the Frontal sinsuses: 1. Frontal sinus, 2. the Ethmoid sinus, 3. the sphenoid sinus and it's recess. 4. the Ethmoid/Sphenoid turbinates and meatus. These are all cavities or small spaces in the face behind the skin, below and next to the brain and eyeballs.
After this evaluation, the doctor would then pull the scope back and then procede down the nasopharynx, pass the epiglottis to the larynx and inspect this area also. The physician would then take the scope and pass the larynx to the trachea, then into the second anatomical site: the Lung cavity, into either the right or left bronchus?
31622-Bronchoscopy, rigid (not through the nose- but through the mouth) or flexible,(through the mouth or nose), including fluoroscopic guidance, when performed; diagnostic, with cell washing, when performed etc.CPT 2011, pg.112
To me it seems as though the physician at the time of surgery could have evaluated at least 3 or more different anatomical sites. I think this is what you need to see and ask about from the intra/post operative surgical notes.
I hope this helps.