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Related Experiment Video

Updated: Jul 4, 2026

Dual Test Gas Pulmonary Diffusing Capacity Measurement During Exercise in Humans Using the Single-Breath Method
08:44

Dual Test Gas Pulmonary Diffusing Capacity Measurement During Exercise in Humans Using the Single-Breath Method

Published on: February 2, 2024

The carbon monoxide diffusing capacity: clinical implications, coding, and documentation.

Alan L Plummer1

  • 1Medicine, Pulmonary, Allergy, and Critical Care Division, Emory University School of Medicine, Atlanta, GA.

Chest
|June 28, 2008
PubMed
Summary
This summary is machine-generated.

The diffusing capacity of the lung for carbon monoxide (DLCO) test is valuable for diagnosing lung diseases. Billing code 94725 for membrane diffusing capacity has seen a surprising increase, likely due to financial incentives, and its use should be halted until clinically justified.

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Last Updated: Jul 4, 2026

Dual Test Gas Pulmonary Diffusing Capacity Measurement During Exercise in Humans Using the Single-Breath Method
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Published on: September 29, 2020

Area of Science:

  • Pulmonary Medicine
  • Respiratory Physiology

Background:

  • The diffusing capacity of the lung for carbon monoxide (DLCO) is a well-established pulmonary function test.
  • Standardization guidelines exist to reduce variability in DLCO measurements.
  • Billing codes 94720 (DLCO) and 94725 (membrane diffusing capacity) are used for reporting.

Purpose of the Study:

  • To investigate the significant increase in the utilization of billing code 94725.
  • To examine the potential reasons behind the surge in membrane diffusing capacity testing.
  • To recommend a course of action regarding the clinical use and billing of code 94725.

Main Methods:

  • Analysis of Medicare population data from 2000 to 2005.
  • Comparison of utilization rates for billing codes 94720 and 94725.
  • Discussion of potential explanations for observed trends.

Main Results:

  • A >1,000% increase in Medicare claims using code 94725 between 2000 and 2005.
  • Utilization of code 94725 increased 14 times faster than code 94720 during the study period.
  • No current clinical indications exist for membrane diffusing capacity testing.

Conclusions:

  • The dramatic rise in code 94725 billing is likely driven by financial gain, not clinical necessity.
  • Billing and coding for membrane diffusing capacity (94725) should be discontinued until clear clinical indications are established.
  • Healthcare providers must be prepared to justify the use of code 94725 to payers if it continues to be used.