CPT code 94681: Gas-exchange analysis, CO2 output and derived measures2026 Medicare rate & RVUs in Alaska
Reports expired-gas analysis measuring oxygen uptake, carbon dioxide output, oxygen extraction, and derived values at rest or during exercise.
In Alaska, Medicare pays $55.75 for 94681 in the office.
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.
On this page 11 sections
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 Alaska 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. Alaska pays $55.75. The RVUs are the same everywhere; the geographic indexes change the dollars.
- Alaska · this page$55.75
- Los Angeles, CA · California$57.80+$2.05
- Washington, DC area · District of Columbia$58.13+$2.38
- Miami, FL · Florida$53.37−$2.38
- Chicago, IL · Illinois$51.66−$4.09
- Manhattan, NY · New York$57.99+$2.24
- Alabama · Alabama$44.36−$11.39
Other areas in Alaska first, then benchmark localities. Bars start at $0.
Every other payment area
| Payment locality | Office | Facility |
|---|---|---|
| ArkansasArkansas | $43.63 | — |
| ArizonaArizona | $48.64 | — |
| Bakersfield, CACalifornia | $53.91 | — |
| Chico, CACalifornia | $53.82 | — |
| El Centro, CACalifornia | $53.83 | — |
| Fresno, CACalifornia | $53.82 | — |
| Hanford, CACalifornia | $53.82 | — |
| Madera, CACalifornia | $53.82 | — |
| Merced, CACalifornia | $53.82 | — |
| Modesto, CACalifornia | $53.82 | — |
| Napa, CACalifornia | $63.52 | — |
| Oxnard, CACalifornia | $57.63 | — |
| Redding, CACalifornia | $53.82 | — |
| Rest of CaliforniaCalifornia | $53.82 | — |
| Riverside, CACalifornia | $54.15 | — |
| Sacramento, CACalifornia | $56.79 | — |
| Salinas, CACalifornia | $56.59 | — |
| San Diego, CACalifornia | $58.16 | — |
| Marin County, CACalifornia | $67.59 | — |
| San Francisco, CACalifornia | $67.55 | — |
| San Benito County, CACalifornia | $69.12 | — |
| Santa Clara County, CACalifornia | $68.98 | — |
| San Luis Obispo, CACalifornia | $55.65 | — |
| Santa Cruz, CACalifornia | $58.90 | — |
| Santa Maria, CACalifornia | $56.87 | — |
| Santa Rosa, CACalifornia | $59.51 | — |
| Stockton, CACalifornia | $53.82 | — |
| Vallejo, CACalifornia | $63.47 | — |
| Visalia, CACalifornia | $53.82 | — |
| Yuba City, CACalifornia | $53.82 | — |
| ColoradoColorado | $52.68 | — |
| ConnecticutConnecticut | $53.71 | — |
| DelawareDelaware | $49.52 | — |
| Fort Lauderdale, FLFlorida | $51.46 | — |
| Rest of FloridaFlorida | $48.74 | — |
| Atlanta, GAGeorgia | $51.00 | — |
| Rest of GeorgiaGeorgia | $45.71 | — |
| Hawaii, Guam, HIHawaii | $55.49 | — |
| IowaIowa | $45.89 | — |
| IdahoIdaho | $46.18 | — |
| East St. Louis, ILIllinois | $47.72 | — |
| Rest of IllinoisIllinois | $46.98 | — |
| Suburban Chicago, ILIllinois | $52.07 | — |
| IndianaIndiana | $46.49 | — |
| KansasKansas | $45.53 | — |
| KentuckyKentucky | $45.31 | — |
| New Orleans, LALouisiana | $47.73 | — |
| Rest of LouisianaLouisiana | $45.18 | — |
| Metropolitan Boston, MAMassachusetts | $58.49 | — |
| Rest of MassachusettsMassachusetts | $52.25 | — |
| Baltimore area, MDMaryland | $53.54 | — |
| Rest of MarylandMaryland | $50.60 | — |
| Rest of MaineMaine | $46.33 | — |
| Southern Maine, MEMaine | $49.35 | — |
| Detroit, MIMichigan | $49.30 | — |
| Rest of MichiganMichigan | $46.54 | — |
| MinnesotaMinnesota | $50.63 | — |
| Metropolitan Kansas City, MOMissouri | $47.49 | — |
| Metropolitan St. Louis, MOMissouri | $48.07 | — |
| Rest of MissouriMissouri | $44.22 | — |
| MississippiMississippi | $43.94 | — |
| MontanaMontana | $50.10 | — |
| North CarolinaNorth Carolina | $46.90 | — |
| North DakotaNorth Dakota | $49.51 | — |
| NebraskaNebraska | $46.21 | — |
| New HampshireNew Hampshire | $51.72 | — |
| Northern New JerseyNew Jersey | $57.38 | — |
| Rest of New JerseyNew Jersey | $54.37 | — |
| New MexicoNew Mexico | $46.78 | — |
| NevadaNevada | $49.98 | — |
| NYC suburbs and Long Island, NYNew York | $59.40 | — |
| Poughkeepsie and northern NYC suburbs, NYNew York | $54.64 | — |
| Queens, NYNew York | $58.69 | — |
| Rest of New YorkNew York | $47.68 | — |
| OhioOhio | $46.42 | — |
| OklahomaOklahoma | $45.34 | — |
| Portland, OROregon | $54.66 | — |
| Rest of OregonOregon | $49.63 | — |
| Metropolitan Philadelphia, PAPennsylvania | $52.15 | — |
| Rest of PennsylvaniaPennsylvania | $46.57 | — |
| Puerto RicoPuerto Rico | $50.55 | — |
| Rhode IslandRhode Island | $51.52 | — |
| South CarolinaSouth Carolina | $46.73 | — |
| South DakotaSouth Dakota | $49.44 | — |
| TennesseeTennessee | $45.78 | — |
| Austin, TXTexas | $52.46 | — |
| Beaumont, TXTexas | $46.21 | — |
| Brazoria, TXTexas | $49.55 | — |
| Dallas, TXTexas | $49.85 | — |
| Fort Worth, TXTexas | $49.44 | — |
| Galveston, TXTexas | $49.69 | — |
| Houston, TXTexas | $50.23 | — |
| Rest of TexasTexas | $47.84 | — |
| UtahUtah | $47.45 | — |
| VirginiaVirginia | $49.09 | — |
| Virgin Islands, VIUnited States Virgin Islands | $50.55 | — |
| VermontVermont | $49.18 | — |
| Rest of WashingtonWashington | $52.20 | — |
| King County, WAWashington | $59.88 | — |
| WisconsinWisconsin | $47.63 | — |
| West VirginiaWest Virginia | $44.98 | — |
| WyomingWyoming | $49.84 | — |
94681 rates by state
Office rate range in each state. Select a state to see its payment localities.
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
| State / territory | Office rate range | Localities |
|---|---|---|
| AK | $55.75 | 1 |
| AL | $44.36 | 1 |
| AR | $43.63 | 1 |
| AZ | $48.64 | 1 |
| CA | $53.82–$69.12 | 29 |
| CO | $52.68 | 1 |
| CT | $53.71 | 1 |
| DC | $58.13 | 1 |
| DE | $49.52 | 1 |
| FL | $48.74–$53.37 | 3 |
| GA | $45.71–$51.00 | 2 |
| GU | $55.49 | 1 |
| HI | $55.49 | 1 |
| IA | $45.89 | 1 |
| ID | $46.18 | 1 |
| IL | $46.98–$52.07 | 4 |
| IN | $46.49 | 1 |
| KS | $45.53 | 1 |
| KY | $45.31 | 1 |
| LA | $45.18–$47.73 | 2 |
| MA | $52.25–$58.49 | 2 |
| MD | $50.60–$58.13 | 3 |
| ME | $46.33–$49.35 | 2 |
| MI | $46.54–$49.30 | 2 |
| MN | $50.63 | 1 |
| MO | $44.22–$48.07 | 3 |
| MS | $43.94 | 1 |
| MT | $50.10 | 1 |
| NC | $46.90 | 1 |
| ND | $49.51 | 1 |
| NE | $46.21 | 1 |
| NH | $51.72 | 1 |
| NJ | $54.37–$57.38 | 2 |
| NM | $46.78 | 1 |
| NV | $49.98 | 1 |
| NY | $47.68–$59.40 | 5 |
| OH | $46.42 | 1 |
| OK | $45.34 | 1 |
| OR | $49.63–$54.66 | 2 |
| PA | $46.57–$52.15 | 2 |
| PR | $50.55 | 1 |
| RI | $51.52 | 1 |
| SC | $46.73 | 1 |
| SD | $49.44 | 1 |
| TN | $45.78 | 1 |
| TX | $46.21–$52.46 | 8 |
| UT | $47.45 | 1 |
| VA | $49.09–$58.13 | 2 |
| VI | $50.55 | 1 |
| VT | $49.18 | 1 |
| WA | $52.20–$59.88 | 2 |
| WI | $47.63 | 1 |
| WV | $44.98 | 1 |
| WY | $49.84 | 1 |
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
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 Alaska 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
5
- Locality
- Alaska
- Physician work
- 1.500
- Practice expense
- 1.065
- Malpractice
- 0.551
| Component | RVU | Locality factor | Adjusted |
|---|---|---|---|
| Physician work | 0.20 | × 1.500 | 0.3000 |
| Practice expense | 1.27 | × 1.065 | 1.3525 |
| Malpractice | 0.03 | × 0.551 | 0.0165 |
| Total RVUs | 1.6691 | ||
| Conversion factor | × 33.4009 | ||
Office rate, Alaska$55.75
Office: (0.2 × 1.5 + 1.27 × 1.065 + 0.03 × 0.551) × $33.4009 = $55.75
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
| Rule | CMS value | What it means |
|---|---|---|
| Global period | XXX | The global surgery concept doesn’t apply. |
| Multiple procedures | 0 | No multiple-procedure reduction. |
| Bilateral (modifier 50) | 0 | The 150% bilateral adjustment doesn’t apply. |
| Assistant at surgery (80/81/82/AS) | 0 | Not paid without supporting documentation. |
| Co-surgeons (62) | 0 | Not permitted. |
| Team surgery (66) | 0 | Not permitted. |
| Professional/technical | 1 | Diagnostic 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.
How 94681 has changed in Alaska
94681 · Office / nonfacility
$55.75
Effective 2026-10-01
The base rate is $3.16 higher than on 2025-10-01, moving from $52.59 to $55.75 (6.0%).
It is unchanged from the immediately preceding available release, effective 2026-07-01.
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
January 1, 2026
RVU26A
$52.59changed to$55.75
- Conversion factor 32.3465 changed to 33.4009
- Practice expense RVU 1.21 changed to 1.27
- Practice expense GPCI 1.081 changed to 1.065
- Malpractice GPCI 0.592 changed to 0.551
Held through RVU26B, RVU26C, RVU26D.
January 1, 2025
RVU25A
$54.12changed to$52.59
- Conversion factor 33.2875 changed to 32.3465
Held through RVU25B, RVU25C, RVU25D.
March 9, 2024
RVU24AR
$53.23changed to$54.12
- Conversion factor 32.7442 changed to 33.2875
Held through RVU24B, RVU24C, RVU24D.
January 1, 2024
RVU24A
$54.39changed to$53.23
- Conversion factor 33.8872 changed to 32.7442
- Practice expense RVU 1.17 changed to 1.21
- Practice expense GPCI 1.100 changed to 1.081
- Malpractice GPCI 0.603 changed to 0.592
January 1, 2023
RVU23A
$57.62changed to$54.39
- 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
- Practice expense GPCI 1.118 changed to 1.100
- Malpractice GPCI 0.614 changed to 0.603
Held through RVU23B, RVU23C, RVU23D.
January 1, 2022
RVU22A
$60.44changed to$57.62
- Conversion factor 34.8931 changed to 34.6062
- Practice expense RVU 1.27 changed to 1.21
Held through RVU22B, RVU22C, RVU22D.
January 1, 2021
RVU21A
$62.55changed to$60.44
- Conversion factor 36.0896 changed to 34.8931
- Malpractice GPCI 0.661 changed to 0.614
Held through RVU21B, RVU21C, RVU21D.
January 1, 2020
RVU20A
$64.86changed to$62.55
- Conversion factor 36.0391 changed to 36.0896
- Practice expense RVU 1.33 changed to 1.27
- Practice expense GPCI 1.117 changed to 1.118
- Malpractice GPCI 0.708 changed to 0.661
Held through RVU20B, RVU20C, RVU20D.
January 1, 2019
RVU19A
$67.61changed to$64.86
- Conversion factor 35.9996 changed to 36.0391
- Practice expense RVU 1.40 changed to 1.33
Held through RVU19B, RVU19C, RVU19D.
January 1, 2018
RVU18AR1
$63.56changed to$67.61
- Conversion factor 35.8887 changed to 35.9996
- Practice expense RVU 1.31 changed to 1.40
- Practice expense GPCI 1.112 changed to 1.117
- Malpractice GPCI 0.710 changed to 0.708
Held through RVU18B, RVU18C, RVU18D.
January 1, 2017
RVU17A
$61.59changed to$63.56
- Conversion factor 35.8043 changed to 35.8887
- Practice expense RVU 1.27 changed to 1.31
- Practice expense GPCI 1.107 changed to 1.112
- Malpractice GPCI 0.712 changed to 0.710
Held through RVU17B, RVU17C, RVU17D.
January 1, 2016
RVU16A
$62.61changed to$61.59
- Conversion factor 35.9335 changed to 35.8043
- Practice expense RVU 1.29 changed to 1.27
Held through RVU16B, RVU16C, RVU16D.
July 1, 2015
RVU15C
$62.29changed to$62.61
- Conversion factor 35.7547 changed to 35.9335
Held through RVU15D.
January 1, 2015
RVU15A
$58.36changed to$62.29
- Conversion factor 35.8228 changed to 35.7547
- Practice expense RVU 1.21 changed to 1.29
- Practice expense GPCI 1.087 changed to 1.107
- Malpractice GPCI 0.687 changed to 0.712
Held through RVU15B.
January 1, 2014
RVU14A
$61.48changed to$58.36
- Conversion factor 34.0230 changed to 35.8228
- Practice expense RVU 1.40 changed to 1.21
- Practice expense GPCI 1.067 changed to 1.087
- Malpractice GPCI 0.661 changed to 0.687
Held through RVU14B, RVU14C, RVU14D.
January 1, 2013
RVU13AR
Earliest loaded release: $61.48
Held through RVU13B, RVU13C, RVU13D.
| Effective from | Office | Facility | CMS release |
|---|---|---|---|
| 2026-10-01 | $55.75 | Not available in this setting | RVU26D |
| 2026-07-01 | $55.75 | Not available in this setting | RVU26C |
| 2026-04-01 | $55.75 | Not available in this setting | RVU26B |
| 2026-01-01 | $55.75 | Not available in this setting | RVU26A |
| 2025-10-01 | $52.59 | Not available in this setting | RVU25D |
| 2025-07-01 | $52.59 | Not available in this setting | RVU25C |
| 2025-04-01 | $52.59 | Not available in this setting | RVU25B |
| 2025-01-01 | $52.59 | Not available in this setting | RVU25A |
| 2024-10-01 | $54.12 | Not available in this setting | RVU24D |
| 2024-07-01 | $54.12 | Not available in this setting | RVU24C |
| 2024-04-01 | $54.12 | Not available in this setting | RVU24B |
| 2024-03-09 | $54.12 | Not available in this setting | RVU24AR |
| 2024-01-01 | $53.23 | Not available in this setting | RVU24A |
| 2023-10-01 | $54.39 | Not available in this setting | RVU23D |
| 2023-07-01 | $54.39 | Not available in this setting | RVU23C |
| 2023-04-01 | $54.39 | Not available in this setting | RVU23B |
| 2023-01-01 | $54.39 | Not available in this setting | RVU23A |
| 2022-10-01 | $57.62 | Not available in this setting | RVU22D |
| 2022-07-01 | $57.62 | Not available in this setting | RVU22C |
| 2022-04-01 | $57.62 | Not available in this setting | RVU22B |
| 2022-01-01 | $57.62 | Not available in this setting | RVU22A |
| 2021-10-01 | $60.44 | Not available in this setting | RVU21D |
| 2021-07-01 | $60.44 | Not available in this setting | RVU21C |
| 2021-04-01 | $60.44 | Not available in this setting | RVU21B |
| 2021-01-01 | $60.44 | Not available in this setting | RVU21A |
| 2020-10-01 | $62.55 | Not available in this setting | RVU20D |
| 2020-07-01 | $62.55 | Not available in this setting | RVU20C |
| 2020-04-01 | $62.55 | Not available in this setting | RVU20B |
| 2020-01-01 | $62.55 | Not available in this setting | RVU20A |
| 2019-10-01 | $64.86 | Not available in this setting | RVU19D |
| 2019-07-01 | $64.86 | Not available in this setting | RVU19C |
| 2019-04-01 | $64.86 | Not available in this setting | RVU19B |
| 2019-01-01 | $64.86 | Not available in this setting | RVU19A |
| 2018-10-01 | $67.61 | Not available in this setting | RVU18D |
| 2018-07-01 | $67.61 | Not available in this setting | RVU18C |
| 2018-04-01 | $67.61 | Not available in this setting | RVU18B |
| 2018-01-01 | $67.61 | Not available in this setting | RVU18AR1 |
| 2017-10-01 | $63.56 | Not available in this setting | RVU17D |
| 2017-07-01 | $63.56 | Not available in this setting | RVU17C |
| 2017-04-01 | $63.56 | Not available in this setting | RVU17B |
| 2017-01-01 | $63.56 | Not available in this setting | RVU17A |
| 2016-10-01 | $61.59 | Not available in this setting | RVU16D |
| 2016-07-01 | $61.59 | Not available in this setting | RVU16C |
| 2016-04-01 | $61.59 | Not available in this setting | RVU16B |
| 2016-01-01 | $61.59 | Not available in this setting | RVU16A |
| 2015-10-01 | $62.61 | Not available in this setting | RVU15D |
| 2015-07-01 | $62.61 | Not available in this setting | RVU15C |
| 2015-04-01 | $62.29 | Not available in this setting | RVU15B |
| 2015-01-01 | $62.29 | Not available in this setting | RVU15A |
| 2014-10-01 | $58.36 | Not available in this setting | RVU14D |
| 2014-07-01 | $58.36 | Not available in this setting | RVU14C |
| 2014-04-01 | $58.36 | Not available in this setting | RVU14B |
| 2014-01-01 | $58.36 | Not available in this setting | RVU14A |
| 2013-10-01 | $61.48 | Not available in this setting | RVU13D |
| 2013-07-01 | $61.48 | Not available in this setting | RVU13C |
| 2013-04-01 | $61.48 | Not available in this setting | RVU13B |
| 2013-01-01 | $61.48 | Not available in this setting | RVU13AR |
Where the Alaska rate applies
Alaska is a Medicare payment area, not a city. Our Census mapping connects it to 355 cities and communities in Alaska. Some span more than one payment area; confirm with the service ZIP.
- Adak
- Akhiok
- Akiachak
- Akiak
- Akutan
- Alakanuk
- Alatna
- Alcan Border
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
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