CPT code 94728: Airway resistance, oscillometry2026 Medicare rate & RVUs

Medicare pays $48.10 for 94728 nationally in the office. Local office rates run $42.26–$65.98.

Medicare allowed amount for participating (non-QP) physicians, before deductible, coinsurance and claim adjustments. Not a patient’s bill or a hospital charge.

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.

Where 94728 pays more and less

The same RVUs, adjusted for each area’s costs. Open a locality for its calculation, history and nearby areas.

109 of 109 payment localities

94728 rates by state

Office rate range in each state. Select a state to see its payment localities.

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.

Payment rules and modifiers for 94728

The CMS indicators that decide how 94728 is paid alongside other services.

What modifiers do to the payment

When to use modifier 26

94728 compared with similar codes

How to choose

94010SpirometryNo post-bronchodilator comparison

Choose 94728 for oscillometry measurements made during quiet breathing. Choose 94010 when the service is spirometry measuring airflow and volume during breathing maneuvers.

94726Body plethysmographyLung volumes, plethysmographic method

94726 measures lung volumes by plethysmography; 94728 measures respiratory mechanics using oscillometry. They describe different tests.

94727Lung volumesGas dilution or washout

94727 measures lung volumes by gas dilution or washout. It is not the code for oscillometry-based airway resistance testing.

Codes related to 94728

Related codes aren’t interchangeable: bill the code that matches the service performed.

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

Open CMS sourceHow we calculate rates