Physician-owned vascular lab coding

suatlian

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Do I consider the procedures done in a physician-owned vascular lab as done by the doctors themselves? A new patient has, say, a carotid duplex scan in the vascular lab, and minutes later sees a doctor for an office visit. Do I need to add a 25 modifier when coding for the office visit?

Another scenario: A patient has an AV fistula placed for dialysis, but within the post-op period, comes in for a lower extremity duplex arterial scan for claudication. Do I put a 79 modifier for the vascular lab charge?
 
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