Wiki Anesthesia for Gastro

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jeni20us@yahoo.com

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Do we need any modify for CPT 99100 ? I bill CPT 00813 and patient is 80 years old. I used CPT 99100 with a modifier AA. BS denied CPT 99100 due to invalid modifier ?
dos : 01.02.2022 00813 AAQS P2 (LINE 1)
01.02.2022 99100 AA ( Line 2)
bs denied line 2 due to invalid mod . Any know why
 
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