What are the indications for plethysmography and use of code 94726?


The indications for plethysmography include:

  • Diagnosis of restrictive lung disease
  • Measurement of lung volumes to distinguish between restrictive and obstructive processes
  • Evaluation of obstructive lung diseases, such as bullous emphysema and cystic fibrosis
  • Measurement of lung volumes when multiple repeated trials are required or when the subject is unable to perform multibreath tests
  • Evaluation of resistance to airflow
  • Determination of the response to bronchodilators
  • Determination of bronchial hyperreactivity in response to methacholine, histamine, or isocapnic hyperventilation
  • Following the course of disease and response to treatment

This question was answered in our Coding Essentials for RT/Pulmonary Function. For more hot topics relating to respiratory services, please visit our store or call us at 1.800.252.1578, ext. 2.


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