Question Endoscopic sinus surgery-modifier question

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Does anyone know if it's appropriate to use a 51 modifier when performing surgery on more than one area of the sinuses in an ambulatory surgery center setting? For example, The doctor performed a bilateral frontal sinusotomy as well as a bilateral maxillary antrostomy. Should it be coded 31276-50 , 31267-50-51 ? Thanks for your help
 
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