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CPT code 94681: Gas-exchange analysis, CO2 output and derived measures2026 Medicare rate & RVUs in Fort Worth, TX

Reports expired-gas analysis measuring oxygen uptake, carbon dioxide output, oxygen extraction, and derived values at rest or during exercise.

CMS RVU26DEffective Oct 1, 2026One payment locality3K Medicare services in 2024

In Fort Worth, TX, Medicare pays $49.44 for 94681 in the office.

$49.44Office (non-facility)
Not available in this settingHospital or facility
−1.3%vs the national office rate ($50.10)

Check a contract rate as a % of Medicare · 94681 nationwide

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

We’ll open 94681 for the payment locality that covers the ZIP.

On this page 11 sections
  1. Rate in Fort Worth, TX
  2. What 94681 covers
  3. Compared with other areas
  4. Rate map
  5. How it’s calculated
  6. Payment rules
  7. Related codes
  8. Rate history
  9. Where it applies
  10. Billing questions
  11. Sources

What 94681 covers

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.

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.

How Fort Worth, TX compares for 94681

Across 109 of 109 payment localities, the office rate for 94681 runs from $43.63 in Arkansas to $69.12 in San Benito County, CA. Fort Worth, TX pays $49.44. The RVUs are the same everywhere; the geographic indexes change the dollars.

94681 in Fort Worth, TX vs other payment areas
  1. Fort Worth, TX · this page$49.44
  2. Austin, TX · Texas$52.46+$3.02
  3. Beaumont, TX · Texas$46.21−$3.23
  4. Brazoria, TX · Texas$49.55+$0.11
  5. Dallas, TX · Texas$49.85+$0.41
  6. Galveston, TX · Texas$49.69+$0.25
  7. Houston, TX · Texas$50.23+$0.79

Other areas in Texas first, then benchmark localities. Bars start at $0.

Every other payment area

94681 in every other Medicare payment locality
Payment localityOfficeFacility
Rest of TexasTexas$47.84—
Los Angeles, CACalifornia$57.80—
Washington, DC areaDistrict of Columbia$58.13—
Miami, FLFlorida$53.37—
Chicago, ILIllinois$51.66—
Manhattan, NYNew York$57.99—
AlaskaAlaska$55.75—
AlabamaAlabama$44.36—

94681 rates by state

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

MEWIVTNHMTNDMNMINYMARIWAIDWYSDIAILINOHPANJCTORNVUTCONEMOKYWVVAMDDECAAZNMKSOKARTNNCSCDCTXLAMSALGAFLAKHI

Explore a state

Local rates. Clear comparisons.

Hover or focus a tile to see its rate range. Select it to open the state’s fee schedule.

$43.63

$61.47

Color shows the midpoint of each state’s locality range.

View every state and territory as a table
94681 office rate range by state
State / territoryOffice rate rangeLocalities
AK$55.751
AL$44.361
AR$43.631
AZ$48.641
CA$53.82–$69.1229
CO$52.681
CT$53.711
DC$58.131
DE$49.521
FL$48.74–$53.373
GA$45.71–$51.002
GU$55.491
HI$55.491
IA$45.891
ID$46.181
IL$46.98–$52.074
IN$46.491
KS$45.531
KY$45.311
LA$45.18–$47.732
MA$52.25–$58.492
MD$50.60–$58.133
ME$46.33–$49.352
MI$46.54–$49.302
MN$50.631
MO$44.22–$48.073
MS$43.941
MT$50.101
NC$46.901
ND$49.511
NE$46.211
NH$51.721
NJ$54.37–$57.382
NM$46.781
NV$49.981
NY$47.68–$59.405
OH$46.421
OK$45.341
OR$49.63–$54.662
PA$46.57–$52.152
PR$50.551
RI$51.521
SC$46.731
SD$49.441
TN$45.781
TX$46.21–$52.468
UT$47.451
VA$49.09–$58.132
VI$50.551
VT$49.181
WA$52.20–$59.882
WI$47.631
WV$44.981
WY$49.841

See 94681 in every payment locality

How the 94681 rate is calculated

Each of 94681’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.

How the rate is built · 94681

RVUs × geographic indexes × conversion factor

Office or facility?

Work0.20

0.20 RVUs× 1.000 GPCI

Practice expense1.27

1.27 RVUs× 1.000 GPCI

Malpractice0.03

0.03 RVUs× 1.000 GPCI

Adjusted RVUs

1.5000

Conversion factor

$33.4009

Medicare rate

$50.10

Every GPCI starts at 1.000, the national rate. Enter a ZIP or drag a slider.

The exact Fort Worth, TX inputs and CMS source lines

PPRRVU2026_Oct_nonQPP.csv

12,424

Code
94681
Physician work
0.20
Practice expense
1.27
Malpractice
0.03

GPCI2026.csv

100

Locality
Fort Worth, TX
Physician work
1.009
Practice expense
0.986
Malpractice
0.871
Office calculation for 94681 in Fort Worth, TX
ComponentRVULocality factorAdjusted
Physician work0.20× 1.0090.2018
Practice expense1.27× 0.9861.2522
Malpractice0.03× 0.8710.0261
Total RVUs1.4802
Conversion factor× 33.4009

Office rate, Fort Worth, TX$49.44

Office: (0.2 × 1.009 + 1.27 × 0.986 + 0.03 × 0.871) × $33.4009 = $49.44

Open 94681 in the RVU calculator

Payment rules and modifiers for 94681

The CMS indicators that decide how 94681 is paid alongside other services.

CMS payment indicators · 94681

Gas-exchange analysis, CO2 output and derived measures

RuleCMS valueWhat it means
Global periodXXXThe global surgery concept doesn’t apply.
Multiple procedures0No multiple-procedure reduction.
Bilateral (modifier 50)0The 150% bilateral adjustment doesn’t apply.
Assistant at surgery (80/81/82/AS)0Not paid without supporting documentation.
Co-surgeons (62)0Not permitted.
Team surgery (66)0Not permitted.
Professional/technical1Diagnostic test with separate professional (26) and technical (TC) components.

What modifiers do to the payment

Modifier 26 · payment effect

With and without the modifier

94681 without 26 · national office

$50.10

Gas-exchange analysis, CO2 output and derived measures

94681-26 · Professional component

$9.69

Pays only the interpretation and report.

When to use modifier 26

Codes related to 94681

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

Codes related to 94681
CodeHow it relatesOffice range, Fort Worth, TX
Same family
94680Oxygen uptake test, direct, rest and exerciseA simpler oxygen-uptake analysis, without 94681's broader gas-exchange measures.$57.05
Used instead
94690Metabolic testing, resting oxygen uptakeFor indirect oxygen-uptake measurement at rest rather than 94681's broader analysis.$51.68
94621Exercise test, cardiopulmonary gas analysisFor cardiopulmonary exercise testing that includes electrocardiographic recording.$164.06

How 94681 has changed in Fort Worth, TX

94681 · Office / nonfacility

$49.44

Effective 2026-10-01

The base rate is $2.96 higher than on 2025-10-01, moving from $46.48 to $49.44 (6.4%).

It is unchanged from the immediately preceding available release, effective 2026-07-01.

Base rate by release · bars start at $0 · select a bar to compare

One bar per available release, ordered by effective date. Missing rates remain gaps. These comparisons hold the code, setting and locality identifiers constant; they do not isolate which policy or input caused a change.

What changed, release by release

  1. January 1, 2026

    RVU26A

    $46.48changed to$49.44

    • Conversion factor 32.3465 changed to 33.4009
    • Practice expense RVU 1.21 changed to 1.27
    • Work GPCI 1.011 changed to 1.009
    • Practice expense GPCI 0.998 changed to 0.986
    • Malpractice GPCI 0.902 changed to 0.871

    Held through RVU26B, RVU26C, RVU26D.

  2. January 1, 2025

    RVU25A

    $47.83changed to$46.48

    • Conversion factor 33.2875 changed to 32.3465

    Held through RVU25B, RVU25C, RVU25D.

  3. March 9, 2024

    RVU24AR

    $47.05changed to$47.83

    • Conversion factor 32.7442 changed to 33.2875

    Held through RVU24B, RVU24C, RVU24D.

  4. January 1, 2024

    RVU24A

    $47.09changed to$47.05

    • Conversion factor 33.8872 changed to 32.7442
    • Practice expense RVU 1.17 changed to 1.21
    • Work GPCI 1.013 changed to 1.011
    • Practice expense GPCI 0.996 changed to 0.998
    • Malpractice GPCI 0.721 changed to 0.902

  5. January 1, 2023

    RVU23A

    $49.07changed to$47.09

    • Conversion factor 34.6062 changed to 33.8872
    • Practice expense RVU 1.21 changed to 1.17
    • Malpractice RVU 0.02 changed to 0.03
    • Work GPCI 1.016 changed to 1.013
    • Practice expense GPCI 0.995 changed to 0.996
    • Malpractice GPCI 0.539 changed to 0.721

    Held through RVU23B, RVU23C, RVU23D.

  6. January 1, 2022

    RVU22A

    $51.56changed to$49.07

    • Conversion factor 34.8931 changed to 34.6062
    • Practice expense RVU 1.27 changed to 1.21

    Held through RVU22B, RVU22C, RVU22D.

  7. January 1, 2021

    RVU21A

    $53.18changed to$51.56

    • Conversion factor 36.0896 changed to 34.8931
    • Work GPCI 1.011 changed to 1.016
    • Practice expense GPCI 0.991 changed to 0.995
    • Malpractice GPCI 0.643 changed to 0.539

    Held through RVU21B, RVU21C, RVU21D.

  8. January 1, 2020

    RVU20A

    $55.06changed to$53.18

    • Conversion factor 36.0391 changed to 36.0896
    • Practice expense RVU 1.33 changed to 1.27
    • Work GPCI 1.007 changed to 1.011
    • Practice expense GPCI 0.986 changed to 0.991
    • Malpractice GPCI 0.747 changed to 0.643

    Held through RVU20B, RVU20C, RVU20D.

  9. January 1, 2019

    RVU19A

    $57.48changed to$55.06

    • Conversion factor 35.9996 changed to 36.0391
    • Practice expense RVU 1.40 changed to 1.33

    Held through RVU19B, RVU19C, RVU19D.

  10. January 1, 2018

    RVU18AR1

    $54.36changed to$57.48

    • Conversion factor 35.8887 changed to 35.9996
    • Practice expense RVU 1.31 changed to 1.40
    • Work GPCI 1.006 changed to 1.007
    • Practice expense GPCI 0.991 changed to 0.986
    • Malpractice GPCI 0.760 changed to 0.747

    Held through RVU18B, RVU18C, RVU18D.

  11. January 1, 2017

    RVU17A

    $52.99changed to$54.36

    • Conversion factor 35.8043 changed to 35.8887
    • Practice expense RVU 1.27 changed to 1.31
    • Work GPCI 1.005 changed to 1.006
    • Practice expense GPCI 0.995 changed to 0.991
    • Malpractice GPCI 0.772 changed to 0.760

    Held through RVU17B, RVU17C, RVU17D.

  12. January 1, 2016

    RVU16A

    $53.90changed to$52.99

    • Conversion factor 35.9335 changed to 35.8043
    • Practice expense RVU 1.29 changed to 1.27

    Held through RVU16B, RVU16C, RVU16D.

  13. July 1, 2015

    RVU15C

    $53.63changed to$53.90

    • Conversion factor 35.7547 changed to 35.9335

    Held through RVU15D.

  14. January 1, 2015

    RVU15A

    $50.53changed to$53.63

    • Conversion factor 35.8228 changed to 35.7547
    • Practice expense RVU 1.21 changed to 1.29
    • Work GPCI 1.002 changed to 1.005
    • Practice expense GPCI 0.987 changed to 0.995
    • Malpractice GPCI 0.799 changed to 0.772

    Held through RVU15B.

  15. January 1, 2014

    RVU14A

    $54.00changed to$50.53

    • Conversion factor 34.0230 changed to 35.8228
    • Practice expense RVU 1.40 changed to 1.21
    • Work GPCI 1.000 changed to 1.002
    • Practice expense GPCI 0.979 changed to 0.987
    • Malpractice GPCI 0.826 changed to 0.799

    Held through RVU14B, RVU14C, RVU14D.

  16. January 1, 2013

    RVU13AR

    Earliest loaded release: $54.00

    Held through RVU13B, RVU13C, RVU13D.

Rates in every CMS release
Effective fromOfficeFacilityCMS release
2026-10-01$49.44Not available in this settingRVU26D
2026-07-01$49.44Not available in this settingRVU26C
2026-04-01$49.44Not available in this settingRVU26B
2026-01-01$49.44Not available in this settingRVU26A
2025-10-01$46.48Not available in this settingRVU25D
2025-07-01$46.48Not available in this settingRVU25C
2025-04-01$46.48Not available in this settingRVU25B
2025-01-01$46.48Not available in this settingRVU25A
2024-10-01$47.83Not available in this settingRVU24D
2024-07-01$47.83Not available in this settingRVU24C
2024-04-01$47.83Not available in this settingRVU24B
2024-03-09$47.83Not available in this settingRVU24AR
2024-01-01$47.05Not available in this settingRVU24A
2023-10-01$47.09Not available in this settingRVU23D
2023-07-01$47.09Not available in this settingRVU23C
2023-04-01$47.09Not available in this settingRVU23B
2023-01-01$47.09Not available in this settingRVU23A
2022-10-01$49.07Not available in this settingRVU22D
2022-07-01$49.07Not available in this settingRVU22C
2022-04-01$49.07Not available in this settingRVU22B
2022-01-01$49.07Not available in this settingRVU22A
2021-10-01$51.56Not available in this settingRVU21D
2021-07-01$51.56Not available in this settingRVU21C
2021-04-01$51.56Not available in this settingRVU21B
2021-01-01$51.56Not available in this settingRVU21A
2020-10-01$53.18Not available in this settingRVU20D
2020-07-01$53.18Not available in this settingRVU20C
2020-04-01$53.18Not available in this settingRVU20B
2020-01-01$53.18Not available in this settingRVU20A
2019-10-01$55.06Not available in this settingRVU19D
2019-07-01$55.06Not available in this settingRVU19C
2019-04-01$55.06Not available in this settingRVU19B
2019-01-01$55.06Not available in this settingRVU19A
2018-10-01$57.48Not available in this settingRVU18D
2018-07-01$57.48Not available in this settingRVU18C
2018-04-01$57.48Not available in this settingRVU18B
2018-01-01$57.48Not available in this settingRVU18AR1
2017-10-01$54.36Not available in this settingRVU17D
2017-07-01$54.36Not available in this settingRVU17C
2017-04-01$54.36Not available in this settingRVU17B
2017-01-01$54.36Not available in this settingRVU17A
2016-10-01$52.99Not available in this settingRVU16D
2016-07-01$52.99Not available in this settingRVU16C
2016-04-01$52.99Not available in this settingRVU16B
2016-01-01$52.99Not available in this settingRVU16A
2015-10-01$53.90Not available in this settingRVU15D
2015-07-01$53.90Not available in this settingRVU15C
2015-04-01$53.63Not available in this settingRVU15B
2015-01-01$53.63Not available in this settingRVU15A
2014-10-01$50.53Not available in this settingRVU14D
2014-07-01$50.53Not available in this settingRVU14C
2014-04-01$50.53Not available in this settingRVU14B
2014-01-01$50.53Not available in this settingRVU14A
2013-10-01$54.00Not available in this settingRVU13D
2013-07-01$54.00Not available in this settingRVU13C
2013-04-01$54.00Not available in this settingRVU13B
2013-01-01$54.00Not available in this settingRVU13AR

Price 94681 for an earlier date of service

Where the Fort Worth, TX rate applies

Fort Worth, TX is a Medicare payment area, not a city. Our Census mapping connects it to 45 cities and communities in Texas. Some span more than one payment area; confirm with the service ZIP.

Browse all communities in Texas

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 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

Show the CMS file lines behind this rate
RVUs for 94681PPRRVU2026_Oct_nonQPP.csv, line 12,424 (RVU26D)
Geographic factors for Fort Worth, TXGPCI2026.csv, line 100 (RVU26D)

Open CMS sourceHow we calculate rates

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