Asphenoidotomyperformed vianasal/sinus endoscopyis specifically reported withCPT 31287(endoscopic sinus surgery, sphenoidotomy). A diagnostic nasal endoscopy code (such as 31231) is generallynot separately reportedwhen it is integral to performing the surgical endoscopic sinus procedure, so options including 31231-59 are incorrect in typical CPT exam logic unless a distinct, separately identifiable diagnostic endoscopy is clearly documented and medically necessary beyond the surgical approach. The diagnosis describes afracture of the skull baseinvolving the sphenoid sinus without CSF leak; among the offered diagnosis codes,S02.19XAcorrectly represents a skull base fracture category consistent with the scenario’s specificity as presented in the answer choices. Code31291represents a different sinus procedure (not sphenoidotomy). CPC key point: choose the code matching thespecific sinus and surgical action(sphenoidotomy → 31287) and avoid unbundling the diagnostic endoscopy that is part of the operative endoscopic approach.