$52.64
94680 represents simpler oxygen-uptake analysis. 94681 includes carbon dioxide output, oxygen extraction, and related derived measures.
On this page
CMS RVU26D · Effective 2026-10-01
94681 Gas-exchange analysis Medicare reimbursement rates in Kansas
Reports expired-gas analysis measuring oxygen uptake, carbon dioxide output, oxygen extraction, and derived values at rest or during exercise. Compare 94681 office and facility rates across CMS payment localities in Kansas.
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 94681 in Kansas?
Kansas 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
$45.53
1 of 1 localities have a supported rate.
Payment area: Kansas
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 function testing
About 94681: Expired-gas oxygen uptake analysis
Reports expired-gas analysis measuring oxygen uptake, carbon dioxide output, oxygen extraction, and derived values at rest or during exercise.
This test analyzes expired gas to quantify oxygen uptake, carbon dioxide output, oxygen extraction percentage, and related derived values. It may be performed at rest or with exercise, often in a pulmonary function or exercise physiology laboratory when a clinician needs detailed metabolic gas-exchange data. Pulmonary laboratory staff, such as respiratory therapists, typically operate the analyzer, with a qualified professional interpreting the results.
Select 94681 when the performed analysis includes carbon dioxide output, oxygen extraction, and other derived gas-exchange measures; document the test conditions, whether exercise was used, the measurements, and the interpretation. Distinguish it from simpler oxygen-uptake analysis and indirect resting measurement. CMS recognizes professional and technical components: report modifier 26 for interpretation, TC for equipment and staff, or neither modifier for the global service.
CMS billing rules for 94681
- 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 RVU0.20 · 13%
- Practice expense (office) RVU1.27 · 85%
- Malpractice RVU0.03 · 2%
3K
Medicare services in 2024 · #2179 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.
94681 compared with similar codes
Office rates for Kansas, from the same CMS release.
$47.36
94690 is an indirect oxygen-uptake measurement at rest. 94681 analyzes a broader set of expired-gas measures and may be performed with or without exercise.
$152.99
94621 is a broader cardiopulmonary exercise test with electrocardiographic recording. Use 94681 for the expired-gas analysis when that full exercise-testing service is not performed.
Compare 94681 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
Kansas →
Office / nonfacility
$45.53
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 94681 in Kansas.
PPRRVU2026_Oct_nonQPP.csv
12,424
- Code
- 94681
- Physician work
- 0.20
- Practice expense
- 1.27
- Malpractice
- 0.03
GPCI2026.csv
54
- Locality
- Kansas
- Physician work
- 1.000
- Practice expense
- 0.904
- Malpractice
- 0.504
| Component | RVU | Locality factor | Adjusted |
|---|---|---|---|
| Physician work | 0.20 | × 1.000 | 0.2000 |
| Practice expense | 1.27 | × 0.904 | 1.1481 |
| Malpractice | 0.03 | × 0.504 | 0.0151 |
| Total RVUs | 1.3632 | ||
| Conversion factor | × 33.4009 | ||
Office / nonfacility rate, Kansas$45.53
Explore RVUs, geographic factors and the full formula
Office / nonfacility
| Component | RVU | Local GPCI |
|---|---|---|
| Work | 0.2 | 1 |
| Practice expense | 1.27 | 0.904 |
| Malpractice | 0.03 | 0.504 |
(0.2 × 1 + 1.27 × 0.904 + 0.03 × 0.504) × $33.4009 = $45.53
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.
94681 billing questions
How does 94681 differ from 94680?
94681 captures carbon dioxide output, oxygen extraction, and additional derived gas-exchange values. Use 94680 for the simpler oxygen-uptake analysis described by that code.
Can 94681 be performed without exercise?
Yes. The analysis may be performed at rest or with exercise; document the conditions under which the gas measurements were obtained.
Which modifiers identify the professional and technical components?
Append modifier 26 for the interpretation and TC for the equipment and staff portion. Without either modifier, the claim represents the global service.
Are oxygen uptake and the derived gas measurements separate units?
No. Report the analysis as one service rather than separate units for each gas measurement or derived value.
When would 94621 be a better fit?
94621 describes cardiopulmonary exercise testing with electrocardiographic recording and gas-exchange measurements. Choose it when that broader exercise test is performed rather than an expired-gas analysis alone.
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.
12,42194680,,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
12,42594681,26,O2 uptk co2 outp % o2 xtrc,A,,0.20,0.08,,0.08,,0.01,0.29,0.29,1,XXX,0.00,0.00,0.00,0,0,0,0,0,9,,33.4009,09,0,99,0.00,0.00,0.00
12,42694681,TC,O2 uptk co2 outp % o2 xtrc,A,,0.00,1.19,,1.19,NA,0.02,1.21,1.21,1,XXX,0.00,0.00,0.00,0,0,0,0,0,9,,33.4009,02,0,99,0.00,0.00,0.00
12,42794690,,O2 uptk rest indirect,A,,0.07,1.48,,1.48,NA,0.02,1.57,1.57,1,XXX,0.00,0.00,0.00,0,0,0,0,0,9,,33.4009,09,0,99,0.00,0.00,0.00
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
5707202,LA,99,REST OF LOUISIANA,1.000,0.885,0.958