CPT code 94728: Airway resistance2026 Medicare rate & RVUs in Guam
Measures respiratory resistance and related mechanics during quiet breathing with oscillometry, often as part of evaluating obstructive airway symptoms or disease.
Medicare pays $53.17 for 94728 in the office in Guam (Hawaii, Guam). Which amount applies depends on the service address.
Medicare allowed amount for participating (non-QP) physicians, before deductible, coinsurance and claim adjustments. Not a patient’s bill or a hospital charge.
On this page 9 sections
What 94728 covers
Oscillometry assesses respiratory-system mechanics by applying small pressure oscillations while the patient breathes quietly through a mouthpiece. The test measures airway resistance and related responses without requiring repeated forceful expiratory maneuvers. Pulmonary function laboratories commonly perform it under the direction of pulmonologists, allergists, or other clinicians evaluating conditions such as asthma or obstructive lung disease; it can also provide measurements when a patient has difficulty completing effort-dependent testing.
Report 94728 for the oscillometry test itself, not for spirometry, lung-volume measurement, or gas-transfer testing. Documentation should identify the test performed and include the recorded results and the interpreting clinician’s findings. CMS recognizes a professional component, reported with modifier 26 for interpretation, and a technical component, reported with modifier TC for equipment and staff. Reporting the code without either modifier represents the global service, including both components.
This summary was written with AI assistance from CMS physician fee schedule data and checked against the CMS billing rules shown here. Rates on this page come directly from CMS files.
94728 in Hawaii, Guam
| Payment locality | Office | Facility |
|---|---|---|
| Hawaii, Guam | $53.17 | Unavailable |
How the 94728 rate is calculated
Each of 94728’s three RVUs is multiplied by a geographic index (GPCI) for the payment locality, added up, and multiplied by the conversion factor. Drag the indexes or enter a ZIP to see what moves the rate.
How the rate is built · 94728
RVUs × geographic indexes × conversion factor
Work0.25
0.25 RVUs× 1.000 GPCI
Practice expense1.17
1.17 RVUs× 1.000 GPCI
Malpractice0.02
0.02 RVUs× 1.000 GPCI
Adjusted RVUs
1.4400
Conversion factor
$33.4009
Medicare rate
$48.10
Every GPCI starts at 1.000, the national rate. Enter a ZIP or drag a slider.
Payment rules and modifiers for 94728
The CMS indicators that decide how 94728 is paid alongside other services.
CMS payment indicators · 94728
Airway resistance
| Rule | CMS value | What it means |
|---|---|---|
| Global period | XXX | The global surgery concept doesn’t apply. |
| Multiple procedures | 0 | No multiple-procedure reduction. |
| Bilateral (modifier 50) | 0 | The 150% bilateral adjustment doesn’t apply. |
| Assistant at surgery (80/81/82/AS) | 0 | Not paid without supporting documentation. |
| Co-surgeons (62) | 0 | Not permitted. |
| Team surgery (66) | 0 | Not permitted. |
| Professional/technical | 1 | Diagnostic test with separate professional (26) and technical (TC) components. |
What modifiers do to the payment
Modifier 26 · payment effect
With and without the modifier
94728 without 26 · national office
$48.10
Airway resistance
94728-26 · Professional component
$12.36
Pays only the interpretation and report.
94728 compared with similar codes
Compare codes · National
4 codes, side by side
How to choose
- 94010Spirometry
- Choose 94728 for oscillometry measurements made during quiet breathing. Choose 94010 when the service is spirometry measuring airflow and volume during breathing maneuvers.
- 94726Body plethysmography
- 94726 measures lung volumes by plethysmography; 94728 measures respiratory mechanics using oscillometry. They describe different tests.
- 94727Lung volumes
- 94727 measures lung volumes by gas dilution or washout. It is not the code for oscillometry-based airway resistance testing.
94728 billing questions
How is oscillometry different from spirometry?
Oscillometry measures respiratory mechanics during quiet breathing using applied pressure oscillations. Spirometry measures airflow and volume during breathing maneuvers, including forced expiration.
Can 94728 be reported with lung-volume testing?
Yes, when oscillometry and a distinct lung-volume test are both performed and documented. The lung-volume service is separate from the oscillometry measurement.
What do modifiers 26 and TC represent?
Modifier 26 identifies the professional interpretation, while modifier TC identifies the technical service, including equipment and staff. Without either modifier, 94728 represents the global service.
What documentation supports reporting 94728?
Document that oscillometry was performed, the results obtained, and the clinician’s interpretation. For component billing, the record should support the professional or technical service represented by the modifier.
Is airway resistance by oscillometry the same as lung-volume measurement?
No. Oscillometry evaluates respiratory-system mechanics during quiet breathing; lung-volume tests measure volumes of air in the lungs using a different testing method.
Where these rates come from
FeeBase calculates base physician payments from CMS work, practice-expense and malpractice RVUs, adjusted by each locality’s geographic indexes and the conversion factor. Services without a published rate are labeled, never given a made-up amount. Amounts are Medicare allowed amounts before claim adjustments: not a patient’s bill or a commercial rate.
CMS RVU26D · effective Oct 1, 2026 through the day before Jan 1, 2027
Show the CMS file lines behind this rate
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