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Question about one of your diagrams

Date: Feb 5, 2024

Question:

This might be a completely stupid question, but I have been asked this question and don't quite know how to answer it. In your 2024 Interventional Radiology Coding Reference on page 158, can you explain why the superficial femoral on the left side (non-selective side) of the picture is a 1st order, while on the right side of the picture it is a 3rd order? I can't explain why the orders change.

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