Modifer on 36558

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We do coding and billing for a radiologist out of a California hospital, most of his services (x-rays, CT scans etc) are billed with a 26 modifier, we have had no problems with the 36558 without a modifier (insert tun cath) until recently, they (Medicare) are now all of a sudden getting denied for missing modifier, I am confused as to what modifier is needed here. Any insight?
 

papplegate

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what exactly is the denial? for what type of modifier are they looking for? post op period 78 or 79, 26 or TC ?
 
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