Question RE: The "X" modifiers and surgery

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I have read so much on the new "X" modifiers but still can not find the answer to my question. Which "X" modifier would you use in a knee or shoulder scope (as an example) say...29827 and 29823,59. Which "X" modifier would you use in that scenario? Or, 29888 and 29881,59?

Thanks so much !!

Question RE: The "X" modifiers and surgery