Coding Ahead
CasePilot
Medical Coding Assistant
Case2Code
Search and Code Lookup Tool
RedactPHI
HIPAA-Compliant PHI Redaction
DetectICD10CM
ICD-10-CM Code Detection
Log in Register free account
1 code page views remaining. Guest accounts are limited to 1 page view. Register free account to get 5 more views.
Log in Register free account

Official Description

Airway resistance by oscillometry

© Copyright 2025 American Medical Association. All rights reserved.

Common Language Description

Airway resistance by oscillometry, designated by CPT® Code 94728, is a diagnostic procedure utilized to assess airway obstruction in patients. This method is particularly effective in distinguishing between central and peripheral airway obstructions, which is crucial for accurate diagnosis and treatment planning. The procedure employs oscillometry, a technique that utilizes sound waves to monitor and evaluate changes in the airway. It is commonly applied in patients suffering from asthma and other obstructive pulmonary diseases, where understanding the nature of airway resistance is essential for effective management. During the test, clips are affixed to the patient's nose to ensure that air does not enter through the nostrils, thereby allowing for a controlled assessment of airflow through the mouth. The patient is instructed to breathe normally into a mouthpiece connected to a pneumotachograph, which measures airflow. Concurrently, a sound wave generated by a loudspeaker is introduced, and the interaction between the airflow and the sound wave is captured by the oscillometry device. This device records various components of airway obstruction, providing valuable data for the physician. Following the procedure, the physician analyzes the results and compiles a comprehensive written report detailing the findings, which aids in the subsequent clinical decision-making process.

© Copyright 2025 Coding Ahead. All rights reserved.

1. Indications

Airway resistance by oscillometry is indicated for the evaluation of various conditions related to airway obstruction. The following are the specific indications for performing this procedure:

  • Asthma - Patients with asthma may undergo this test to assess the degree of airway obstruction and to monitor changes in their condition over time.
  • Obstructive Pulmonary Diseases - Individuals with other obstructive pulmonary diseases, such as chronic obstructive pulmonary disease (COPD), may be evaluated to determine the nature and extent of airway resistance.
  • Assessment of Airway Changes - The procedure is useful for detecting changes in airway resistance that may occur due to various factors, including environmental triggers or treatment interventions.

2. Procedure

The procedure for airway resistance by oscillometry involves several key steps that ensure accurate measurement of airway obstruction. The following outlines the procedural steps:

  • Preparation of the Patient - The patient is prepared for the test by having clips placed on their nose. This is done to prevent air from entering through the nostrils, ensuring that all airflow is measured through the mouthpiece.
  • Breathing into the Mouthpiece - The patient is instructed to breathe normally into a mouthpiece that is connected to a pneumotachograph. This device measures the airflow during the breathing process, which is critical for the assessment of airway resistance.
  • Introduction of Sound Waves - While the patient breathes, a sound wave generated by a loudspeaker is superimposed over the breathing pattern. This sound wave is essential for the oscillometry technique, as it interacts with the airflow to provide data on airway resistance.
  • Data Collection - The oscillometry device captures the airflow and the response to the sound wave. It records various components of airway obstruction, which are crucial for the physician's analysis.
  • Review of Results - After the test is completed, the physician reviews the recorded data and prepares a written report detailing the findings. This report is used to inform further clinical decisions regarding the patient's management.

3. Post-Procedure

Post-procedure care for airway resistance by oscillometry typically involves minimal recovery time, as the test is non-invasive and does not require sedation. Patients may resume their normal activities immediately following the procedure. The physician will review the results with the patient during a follow-up appointment, discussing any necessary changes to treatment plans based on the findings. It is important for patients to understand the implications of the test results and to follow any recommendations provided by their healthcare provider for ongoing management of their condition.

Short Descr AIRWY RESIST BY OSCILLOMETRY
Medium Descr AIRWAY RESISTANCE BY OSCILLOMETRY
Long Descr Airway resistance by oscillometry
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 STV-Packaged Codes
Type of Service (TOS) 5 - Diagnostic Laboratory
Berenson-Eggers TOS (BETOS) T2D - Other tests - other
MUE 1
CCS Clinical Classification 38 - Other diagnostic procedures on lung and bronchus

This is a primary code that can be used with these additional add-on codes.

94729 Addon Code MPFS Status: Active Code APC N Diffusing capacity (eg, carbon monoxide, membrane) (List separately in addition to code for primary procedure)
59 Distinct procedural service: under certain circumstances, it may be necessary to indicate that a procedure or service was distinct or independent from other non-e/m services performed on the same day. modifier 59 is used to identify procedures/services, other than e/m services, that are not normally reported together, but are appropriate under the circumstances. documentation must support a different session, different procedure or surgery, different site or organ system, separate incision/excision, separate lesion, or separate injury (or area of injury in extensive injuries) not ordinarily encountered or performed on the same day by the same individual. however, when another already established modifier is appropriate it should be used rather than modifier 59. only if no more descriptive modifier is available, and the use of modifier 59 best explains the circumstances, should modifier 59 be used. note: modifier 59 should not be appended to an e/m service. to report a separate and distinct e/m service with a non-e/m service performed on the same date, see modifier 25.
26 Professional component: certain procedures are a combination of a physician or other qualified health care professional component and a technical component. when the physician or other qualified health care professional component is reported separately, the service may be identified by adding modifier 26 to the usual procedure number.
XU Unusual non-overlapping service, the use of a service that is distinct because it does not overlap usual components of the main service
76 Repeat procedure or service by same physician or other qualified health care professional: it may be necessary to indicate that a procedure or service was repeated by the same physician or other qualified health care professional subsequent to the original procedure or service. this circumstance may be reported by adding modifier 76 to the repeated procedure or service. note: this modifier should not be appended to an e/m service.
95 Synchronous telemedicine service rendered via a real-time interactive audio and video telecommunications system: synchronous telemedicine service is defined as a real-time interaction between a physician or other qualified health care professional and a patient who is located at a distant site from the physician or other qualified health care professional. the totality of the communication of information exchanged between the physician or other qualified health care professional and the patient during the course of the synchronous telemedicine service must be of an amount and nature that would be sufficient to meet the key components and/or requirements of the same service when rendered via a face-to-face interaction. modifier 95 may only be appended to the services listed in appendix p. appendix p is the list of cpt codes for services that are typically performed face-to-face, but may be rendered via a real-time (synchronous) interactive audio and video telecommunications system.
GC This service has been performed in part by a resident under the direction of a teaching physician
GV Attending physician not employed or paid under arrangement by the patient's hospice provider
Q1 Routine clinical service provided in a clinical research study that is in an approved clinical research study
TC Technical component; under certain circumstances, a charge may be made for the technical component alone; under those circumstances the technical component charge is identified by adding modifier 'tc' to the usual procedure number; technical component charges are institutional charges and not billed separately by physicians; however, portable x-ray suppliers only bill for technical component and should utilize modifier tc; the charge data from portable x-ray suppliers will then be used to build customary and prevailing profiles
Date
Action
Notes
2020-01-01 Changed Code description changed.
2012-01-01 Added Added
Code
Description
Code
Description
Code
Description
Code
Description
CasePilot

Get instant expert-level medical coding assistance.

Ask about:
CPT Codes Guidelines Modifiers Crosswalks NCCI Edits Compliance Medicare Coverage
Example: "What is CPT code 99213?" or "Guidelines for E/M services"