I have a simple question about the usage of add-on codes and I feel I should know the answer. Is there any rule that limits the number of add-on codes per CPT code? This question came up at work during an audit. A vascular surgeon billed primary procedure code 37228 (unilateral one vessel leg angioplasty) with two add-on codes, 37232 (additional vessel) and 76937-26 (US guidance for vascular access). Thank you in advance to those who respond.
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