CPT code 94013: Lung-volume test, through age 22026 Medicare rate & RVUs

Medicare pays $16.70 for 94013 nationally in a facility.

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

What 94013 covers

This service measures lung volumes using a spirometry technique in children through age 2. It is generally performed in a specialized pediatric pulmonary function laboratory by trained pulmonary function staff, such as a respiratory therapist, with physician oversight. The results help characterize pulmonary function when standard testing requiring active cooperation is not suitable for the child’s age.

Select the code when the documented service measures lung volumes, rather than only expiratory airflow or bronchodilator response. The record should support the child’s age, the spirometry technique, and the lung-volume measurements obtained. The Medicare Physician Fee Schedule represents payment through work, practice-expense, and malpractice RVUs; the practice-expense RVU listed for this code is the same in office and facility settings.

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 94013 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

94013 rates by state

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

How the 94013 rate is calculated

Each of 94013’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 94013

94013 has no global surgery period, no multiple-procedure, bilateral or assistant-at-surgery adjustment, and no professional/technical split. What changes the payment is where the service happens: the place of service on the claim decides whether Medicare pays the office or the facility rate.

94013 compared with similar codes

How to choose

94011Infant spirometryAge 2 years or younger

Use 94011 for the infant spirometry service focused on breathing-capacity and expiratory-flow measurements; 94013 identifies lung-volume measurement.

94012Infant spirometryWith bronchodilator

94012 is the infant spirometry service that includes bronchodilator responsiveness testing. 94013 identifies lung-volume measurement by spirometry technique.

94010SpirometryNo post-bronchodilator comparison

94010 is the general spirometry code. 94013 is specific to spirometry-technique lung-volume measurement in children through age 2.

94726Body plethysmographyLung volumes, plethysmographic method

Choose 94013 for lung-volume measurement using a spirometry technique; 94726 is for lung-volume determination by plethysmography.

Codes related to 94013

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