Bill 91037 and 91038 based on time, not number of electrodes inserted

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Note:  The following article synopsis was NOT provided by HCPro. It was created by Find-A-Code/innoviHealth.

Article Overview

This short coding guidance article addresses CPT billing for impedance pH monitoring and is aimed at coders, billing staff, and gastroenterology practices. It summarizes an official CPT Assistant reference and discusses how to think about code selection for monitored esophageal reflux testing, with emphasis on duration-based reporting and the wording of the CPT descriptors.

Why This Topic Matters

Accurate reporting for esophageal reflux monitoring affects coding consistency and claim processing. This article helps readers understand the general scope of CPT guidance for this service and why the number of electrodes alone does not determine the code choice.

What You Will Learn

  • The general CPT coding topic covered by the article
  • How the article frames duration-based reporting for impedance pH monitoring
  • What official source is referenced for the guidance
  • Why the article is relevant to gastroenterology coding workflows

Who Should Read This

  • Medical coders
  • Billing specialists
  • Gastroenterology practices
  • Revenue cycle staff

Codes Discussed


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