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Code deleted. See 94726, 94727

Official Description

Determination of airway closing volume, single breath tests

© Copyright 2025 American Medical Association. All rights reserved.

Common Language Description

The CPT® Code 94370 refers to the determination of airway closing volume through single breath tests. This procedure involves measuring the total airway closing volume of a patient during a single breath. Airway closing volume is a critical parameter in assessing lung function, particularly in understanding how the airways behave during the breathing cycle. It provides valuable insights into the mechanics of the lungs and can help identify potential respiratory issues. The measurement is typically performed in a controlled environment, where the patient is instructed to take a deep breath and then exhale, allowing for the assessment of the volume at which the airways begin to close. This test is essential for evaluating conditions that may affect lung capacity and airflow, contributing to a comprehensive respiratory assessment.

© Copyright 2025 Coding Ahead. All rights reserved.

1. Indications

The procedure associated with CPT® Code 94370 is indicated for various clinical scenarios where assessment of airway function is necessary. The following conditions may warrant the performance of this test:

  • Assessment of Lung Function This test is utilized to evaluate the overall function of the lungs, particularly in patients with suspected obstructive or restrictive lung diseases.
  • Diagnosis of Respiratory Conditions It aids in diagnosing conditions such as asthma, chronic obstructive pulmonary disease (COPD), and other disorders that may affect airway dynamics.
  • Monitoring of Disease Progression The procedure can be used to monitor changes in airway closing volume over time, providing insights into the progression of respiratory diseases.
  • Preoperative Evaluation It may be indicated as part of a preoperative assessment for patients undergoing thoracic surgery or procedures that may impact lung function.

2. Procedure

The procedure for determining airway closing volume using CPT® Code 94370 involves several key steps that ensure accurate measurement and assessment of the patient's lung function. The following outlines the procedural steps:

  • Step 1: Patient Preparation The patient is prepared for the test by ensuring they are in a comfortable position, typically seated. They may be instructed to avoid heavy meals or strenuous activity prior to the test to ensure optimal lung function during measurement.
  • Step 2: Equipment Setup The necessary equipment, including a spirometer or similar device capable of measuring lung volumes, is set up and calibrated according to manufacturer specifications to ensure accuracy.
  • Step 3: Instruction to the Patient The patient is given clear instructions on how to perform the test. They are typically asked to take a deep breath in, filling their lungs completely, and then exhale slowly and steadily into the device.
  • Step 4: Measurement of Airway Closing Volume During the exhalation, the device records the volume of air exhaled and identifies the point at which the airways begin to close. This data is crucial for determining the airway closing volume.
  • Step 5: Data Analysis The results are analyzed, and the airway closing volume is calculated. This information is then documented for further evaluation by the healthcare provider.

3. Post-Procedure

After the completion of the airway closing volume test, the patient may be monitored briefly to ensure they are feeling well and do not experience any adverse effects from the procedure. There are typically no specific post-procedure care requirements, as the test is non-invasive and does not involve any sedation or significant physical exertion. Patients can usually resume their normal activities immediately following the test. The results will be reviewed by the healthcare provider, who will discuss the findings with the patient and determine any necessary follow-up actions or additional testing based on the results obtained.

Short Descr BREATH AIRWAY CLOSING VOLUME
Medium Descr DETER AIRWY CLOSING VOL 1 BRTH TSTS
Long Descr Determination of airway closing volume, single breath tests
Status Code Active Code
Global Days XXX - Global Concept Does Not Apply
PC/TC Indicator (26, TC) 1 - Diagnostic Tests for Radiology Services
Multiple Procedures (51) 0 - No payment adjustment rules for multiple procedures apply.
Bilateral Surgery (50) 0 - 150% payment adjustment for bilateral procedures does NOT apply.
Physician Supervisions 09 - Concept does not apply.
Assistant Surgeon (80, 82) 0 - Payment restriction for assistants at surgery applies to this procedure...
Co-Surgeons (62) 0 - Co-surgeons not permitted for this procedure.
Team Surgery (66) 0 - Team surgeons not permitted for this procedure.
Diagnostic Imaging Family 99 - Concept Does Not Apply
APC Status Indicator Discontinued Code
Type of Service (TOS) 5 - Diagnostic Laboratory
Berenson-Eggers TOS (BETOS) none
MUE Not applicable/unspecified.
CCS Clinical Classification 38 - Other diagnostic procedures on lung and bronchus
Date
Action
Notes
2012-01-01 Deleted Code deleted. See 94726, 94727
Pre-1990 Added Code added.
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