CPT code 94375: Flow-volume loop, respiratory tracing2026 Medicare rate & RVUs

Medicare pays $42.09 for 94375 nationally in the office. Local office rates run $37.33–$56.75.

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

What 94375 covers

During this pulmonary function test, the patient performs breathing maneuvers while equipment records airflow in relation to lung volume, producing a flow-volume tracing. Pulmonary function laboratories, hospital departments, and office-based respiratory practices commonly perform the test, with a respiratory therapist or other trained staff member coaching the maneuvers. Clinicians use the tracing to assess airflow patterns, including patterns that may suggest obstruction in the upper airway.

Report 94375 when the flow-volume loop test is performed and documented, rather than selecting it solely because a loop image appears in a broader pulmonary function report. The record should support the maneuver performed and the resulting tracing; the interpreting clinician’s findings support the professional service. CMS recognizes professional and technical components: modifier 26 identifies interpretation, modifier TC identifies equipment and staff, and reporting without either modifier represents the global service.

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 94375 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

94375 rates by state

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

How the 94375 rate is calculated

Each of 94375’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 94375

The CMS indicators that decide how 94375 is paid alongside other services.

What modifiers do to the payment

When to use modifier 26

94375 compared with similar codes

How to choose

94010SpirometryNo post-bronchodilator comparison

Use 94375 for the flow-volume loop service. Use 94010 when the documented service is spirometry, rather than treating a loop graphic alone as evidence of both services.

94060Bronchodilator spirometryPre- and post-bronchodilator testing

94060 represents spirometry with bronchodilator responsiveness testing. 94375 represents the flow-volume loop test, without that pre- and post-bronchodilator service definition.

94726Body plethysmographyLung volumes, plethysmographic method

94726 measures lung volumes using body plethysmography. 94375 records airflow in relation to lung volume during breathing maneuvers.

Codes related to 94375

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