$45.89
Choose 94680 for direct oxygen-uptake measurement at rest and exercise. 94681 includes carbon dioxide output and oxygen-extraction measures.
On this page
CMS RVU26D · Effective 2026-10-01
94680 Oxygen uptake test Medicare reimbursement rates in Iowa
Reports direct expired-gas measurement of oxygen uptake at rest and during exercise, when both conditions are assessed using this simple testing service. Compare 94680 office and facility rates across CMS payment localities in Iowa.
Amounts below use the non-QP conversion factor for participating physicians. These are base physician payments before claim-level adjustments, not patient costs or total hospital charges.
What does Medicare pay for 94680 in Iowa?
Iowa has 1 payment locality in this comparison. Use the service location to choose the applicable amount. These are the supported base rates for the payment area shown below, using the same CMS release.
Office / nonfacility
$53.06
1 of 1 localities have a supported rate.
Payment area: Iowa
One mapped payment locality.
Facility setting
No supported rate
These are locality ranges, not averages or address-specific quotes. A facility-setting amount covers the physician service; it does not include a hospital’s separate bill. Choose a locality below to inspect its calculation, compare other payment areas, or price a percentage of Medicare.
Pulmonary testing
About 94680: Direct oxygen uptake testing at rest and exercise
Reports direct expired-gas measurement of oxygen uptake at rest and during exercise, when both conditions are assessed using this simple testing service.
This service measures oxygen uptake by analyzing expired gas directly, first at rest and then during exercise. It is performed in pulmonary function laboratories and similar diagnostic settings, typically by respiratory testing staff with a qualified clinician interpreting the findings. The results can help assess exercise-related respiratory or metabolic limitations; the service is narrower than a comprehensive cardiopulmonary exercise evaluation.
Select this code when the documented test includes direct oxygen-uptake measurement at both rest and exercise. The record should support the conditions tested and the direct expired-gas method; distinguish it from indirect measurement and from exercise testing that evaluates a broader set of cardiopulmonary responses. CMS recognizes separately priced professional and technical components: report modifier 26 for the interpretation, modifier TC for equipment and staff, or neither for the global service.
CMS billing rules for 94680
- Professional and technical components
- Diagnostic test with a professional component (modifier 26, interpretation) and a technical component (modifier TC, equipment and staff); billing without a modifier is the global service.
Where the value comes from
- Work RVU0.25 · 14%
- Practice expense (office) RVU1.45 · 84%
- Malpractice RVU0.03 · 2%
1.9K
Medicare services in 2024 · #2496 by national volume
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.
94680 compared with similar codes
Office rates for Iowa, from the same CMS release.
$47.83
94690 is indirect oxygen-uptake analysis at rest. 94680 uses direct expired-gas analysis and includes exercise testing.
$34.74
94618 is pulmonary stress testing focused on the exercise response; 94680 measures oxygen uptake directly from expired gas at rest and during exercise.
$153.95
94621 is a broader cardiopulmonary exercise evaluation with multiple physiologic measures. 94680 identifies the narrower direct oxygen-uptake service.
Compare 94680 by payment locality
Find the payment area for your service address, then open its rate page for calculation inputs, release history and the percentage-of-Medicare tool. A city may cross payment-area boundaries; the ZIP lookup above helps resolve the location.
1 of 1 payment localities
Iowa →
Office / nonfacility
$53.06
Facility
Unavailable
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How this local rate is calculated
Each RVU component is multiplied by its own geographic practice cost index (GPCI). The three adjusted components are added, then multiplied by the conversion factor. These are the inputs used for 94680 in Iowa.
PPRRVU2026_Oct_nonQPP.csv
12,421
- Code
- 94680
- Physician work
- 0.25
- Practice expense
- 1.45
- Malpractice
- 0.03
GPCI2026.csv
53
- Locality
- Iowa
- Physician work
- 1.000
- Practice expense
- 0.915
- Malpractice
- 0.397
| Component | RVU | Locality factor | Adjusted |
|---|---|---|---|
| Physician work | 0.25 | × 1.000 | 0.2500 |
| Practice expense | 1.45 | × 0.915 | 1.3268 |
| Malpractice | 0.03 | × 0.397 | 0.0119 |
| Total RVUs | 1.5887 | ||
| Conversion factor | × 33.4009 | ||
Office / nonfacility rate, Iowa$53.06
Explore RVUs, geographic factors and the full formula
Office / nonfacility
| Component | RVU | Local GPCI |
|---|---|---|
| Work | 0.25 | 1 |
| Practice expense | 1.45 | 0.915 |
| Malpractice | 0.03 | 0.397 |
(0.25 × 1 + 1.45 × 0.915 + 0.03 × 0.397) × $33.4009 = $53.06
The office and facility calculations use their respective practice-expense RVUs. The facility amount here is the physician fee, not a separate hospital or facility bill.
94680 billing questions
How is 94680 different from 94690?
94680 describes direct oxygen-uptake analysis at rest and during exercise. 94690 is for indirect oxygen-uptake analysis at rest.
When should modifier 26 or TC be used?
Use modifier 26 for the professional interpretation and modifier TC for the technical service involving equipment and staff. Report the global service without either modifier when one claim includes both components.
Is 94680 the same as a cardiopulmonary exercise test?
No. 94680 identifies direct oxygen-uptake measurement at rest and with exercise; 94621 describes a broader cardiopulmonary exercise evaluation.
What should the test documentation show?
Document that oxygen uptake was measured by direct expired-gas analysis and that testing covered both rest and exercise.
Where these rates come from
FeeBase calculates base physician payments from CMS work, practice-expense, and malpractice RVUs, adjusted by each locality’s geographic indices and the applicable conversion factor. Unavailable or separately priced services are labeled rather than assigned a made-up amount.
Source: RVU26D. Effective 2026-10-01 through the day before 2027-01-01.
12,41894667,,Mnpj chest wall 1st,A,,0.00,0.80,,0.80,NA,0.02,0.82,0.82,5,XXX,0.00,0.00,0.00,0,0,0,0,0,9,,33.4009,09,0,99,0.00,0.00,0.00
12,41994668,,Mnpj chest wall sbsq,A,,0.00,1.15,,1.15,NA,0.02,1.17,1.17,5,XXX,0.00,0.00,0.00,0,0,0,0,0,9,,33.4009,09,0,99,0.00,0.00,0.00
12,42094669,,Mechanical chest wall oscill,A,,0.00,0.75,,0.75,NA,0.02,0.77,0.77,5,XXX,0.00,0.00,0.00,0,0,0,0,0,9,,33.4009,09,0,99,0.00,0.00,0.00
12,42194680,,O2 uptk rst&xers dir simple,A,,0.25,1.45,,1.45,NA,0.03,1.73,1.73,1,XXX,0.00,0.00,0.00,0,0,0,0,0,9,,33.4009,09,0,99,0.00,0.00,0.00
12,42294680,26,O2 uptk rst&xers dir simple,A,,0.25,0.11,,0.11,,0.01,0.37,0.37,1,XXX,0.00,0.00,0.00,0,0,0,0,0,9,,33.4009,09,0,99,0.00,0.00,0.00
12,42394680,TC,O2 uptk rst&xers dir simple,A,,0.00,1.34,,1.34,NA,0.02,1.36,1.36,1,XXX,0.00,0.00,0.00,0,0,0,0,0,9,,33.4009,02,0,99,0.00,0.00,0.00
12,42494681,,O2 uptk co2 outp % o2 xtrc,A,,0.20,1.27,,1.27,NA,0.03,1.50,1.50,1,XXX,0.00,0.00,0.00,0,0,0,0,0,9,,33.4009,09,0,99,0.00,0.00,0.00
5006102,IL,15,SUBURBAN CHICAGO,1.007,1.027,1.772
5106102,IL,99,REST OF ILLINOIS,1.000,0.913,1.563
5208102,IN,00,INDIANA,1.000,0.927,0.486
5305102,IA,00,IOWA,1.000,0.915,0.397
5405202,KS,00,KANSAS,1.000,0.904,0.504
5515102,KY,00,KENTUCKY,1.000,0.889,0.915
5607202,LA,01,NEW ORLEANS,1.000,0.941,1.136