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CPT code 91133: Electrogastrography, with provocative test2026 Medicare rate & RVUs in Connecticut

Electrogastrography with testing records gastric electrical activity during a challenge, helping evaluate abnormal stomach rhythms in patients with persistent upper gastrointestinal symptoms.

CMS RVU26DEffective Oct 1, 2026One payment locality24 Medicare services in 2024

In Connecticut, Medicare pays $546.42 for 91133 in the office.

$546.42Office (non-facility)
Not available in this settingHospital or facility
+7.5%vs the national office rate ($508.36)

Check a contract rate as a % of Medicare · 91133 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 91133 for the payment locality that covers the ZIP.

On this page 11 sections
  1. Rate in Connecticut
  2. What 91133 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 91133 covers

Electrogastrography with testing records electrical signals from the stomach before and during or after a challenge, commonly a meal, to assess gastric slow-wave patterns and their response. Gastroenterology practices may use it when persistent nausea, vomiting, or suspected gastric dysrhythmia prompts evaluation of gastric electrical function. Surface electrodes capture the signals, which are interpreted in relation to the test protocol.

Report 91133 when the electrogastrography includes a test or challenge; the recording without that test is represented by 91132. Documentation should identify the clinical indication, challenge performed, recording conditions, and interpretation of the resulting gastric electrical activity. CMS recognizes a professional portion for interpretation, reported with modifier 26, and a technical portion for equipment and staff, reported with modifier TC. Billing without either modifier represents 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 Connecticut compares for 91133

Across 109 of 109 payment localities, the office rate for 91133 runs from $439.35 in Arkansas to $725.05 in San Benito County, CA. Connecticut pays $546.42. The RVUs are the same everywhere; the geographic indexes change the dollars.

91133 in Connecticut vs other payment areas
  1. Connecticut · this page$546.42
  2. Los Angeles, CA · California$597.84+$51.42
  3. Washington, DC area · District of Columbia$596.13+$49.71
  4. Miami, FL · Florida$529.82−$16.60
  5. Chicago, IL · Illinois$512.24−$34.18
  6. Manhattan, NY · New York$589.05+$42.63
  7. Alaska · Alaska$550.19+$3.77

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

Every other payment area

91133 in every other Medicare payment locality
Payment localityOfficeFacility
AlabamaAlabama$447.18—
ArkansasArkansas$439.35—
ArizonaArizona$493.15—
Bakersfield, CACalifornia$555.03—
Chico, CACalifornia$554.91—
El Centro, CACalifornia$554.92—
Fresno, CACalifornia$554.91—
Hanford, CACalifornia$554.91—

91133 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.

$439.35

$639.98

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

View every state and territory as a table
91133 office rate range by state
State / territoryOffice rate rangeLocalities
AK$550.191
AL$447.181
AR$439.351
AZ$493.151
CA$554.91–$725.0529
CO$539.501
CT$546.421
DC$596.131
DE$502.541
FL$487.48–$529.823
GA$456.07–$516.402
GU$574.521
HI$574.521
IA$466.451
ID$468.951
IL$466.65–$522.414
IN$472.371
KS$461.211
KY$454.331
LA$452.43–$479.822
MA$534.26–$603.412
MD$514.33–$596.133
ME$469.10–$503.622
MI$466.21–$492.042
MN$521.751
MO$441.27–$485.043
MS$440.551
MT$508.361
NC$475.441
ND$507.771
NE$470.321
NH$528.161
NJ$554.02–$587.532
NM$468.231
NV$508.681
NY$483.76–$602.445
OH$466.091
OK$456.141
OR$506.12–$562.392
PA$468.46–$528.872
PR$513.691
RI$524.701
SC$471.281
SD$507.701
TN$463.671
TX$464.55–$536.488
UT$479.101
VA$499.81–$596.132
VI$513.691
VT$503.011
WA$534.16–$619.572
WI$487.261
WV$445.131
WY$508.101

See 91133 in every payment locality

How the 91133 rate is calculated

Each of 91133’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 · 91133

RVUs × geographic indexes × conversion factor

Office or facility?

Work0.64

0.64 RVUs× 1.000 GPCI

Practice expense14.55

14.55 RVUs× 1.000 GPCI

Malpractice0.03

0.03 RVUs× 1.000 GPCI

Adjusted RVUs

15.2200

Conversion factor

$33.4009

Medicare rate

$508.36

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

The exact Connecticut inputs and CMS source lines

PPRRVU2026_Oct_nonQPP.csv

11,643

Code
91133
Physician work
0.64
Practice expense
14.55
Malpractice
0.03

GPCI2026.csv

38

Locality
Connecticut
Physician work
1.020
Practice expense
1.077
Malpractice
1.210
Office calculation for 91133 in Connecticut
ComponentRVULocality factorAdjusted
Physician work0.64× 1.0200.6528
Practice expense14.55× 1.07715.6704
Malpractice0.03× 1.2100.0363
Total RVUs16.3595
Conversion factor× 33.4009

Office rate, Connecticut$546.42

Office: (0.64 × 1.02 + 14.55 × 1.077 + 0.03 × 1.21) × $33.4009 = $546.42

Open 91133 in the RVU calculator

Payment rules and modifiers for 91133

The CMS indicators that decide how 91133 is paid alongside other services.

CMS payment indicators · 91133

Electrogastrography, with provocative test

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

91133 without 26 · national office

$508.36

Electrogastrography, with provocative test

91133-26 · Professional component

$34.40

Pays only the interpretation and report.

When to use modifier 26

Codes related to 91133

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

Codes related to 91133
CodeHow it relatesOffice range, Connecticut
Same family
91132Electrogastrography, without testElectrogastrography without the test component.$522.21
Used instead
91112Motility capsule, transit and pressure measurementWireless gastrointestinal transit and pressure measurement evaluates transit rather than gastric electrical activity.$1,899.86
78264Gastric emptying, stomach onlyGastric emptying scintigraphy assesses emptying by imaging rather than measuring gastric electrical signals.$311.18

How 91133 has changed in Connecticut

91133 · Office / nonfacility

$546.42

Effective 2026-10-01

The base rate is $84.42 higher than on 2025-10-01, moving from $462.00 to $546.42 (18.3%).

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

    $462.00changed to$546.42

    • Conversion factor 32.3465 changed to 33.4009
    • Work RVU 0.66 changed to 0.64
    • Practice expense RVU 12.44 changed to 14.55
    • Work GPCI 1.022 changed to 1.020
    • Practice expense GPCI 1.091 changed to 1.077
    • Malpractice GPCI 1.207 changed to 1.210

    Held through RVU26B, RVU26C, RVU26D.

  2. January 1, 2025

    RVU25A

    $499.41changed to$462.00

    • Conversion factor 33.2875 changed to 32.3465
    • Practice expense RVU 13.10 changed to 12.44

    Held through RVU25B, RVU25C, RVU25D.

  3. March 9, 2024

    RVU24AR

    $491.26changed to$499.41

    • Conversion factor 32.7442 changed to 33.2875

    Held through RVU24B, RVU24C, RVU24D.

  4. January 1, 2024

    RVU24A

    $523.41changed to$491.26

    • Conversion factor 33.8872 changed to 32.7442
    • Practice expense RVU 13.37 changed to 13.10
    • Work GPCI 1.030 changed to 1.022
    • Practice expense GPCI 1.102 changed to 1.091
    • Malpractice GPCI 1.070 changed to 1.207

  5. January 1, 2023

    RVU23A

    $563.99changed to$523.41

    • Conversion factor 34.6062 changed to 33.8872
    • Practice expense RVU 13.99 changed to 13.37
    • Work GPCI 1.037 changed to 1.030
    • Practice expense GPCI 1.114 changed to 1.102
    • Malpractice GPCI 0.934 changed to 1.070

    Held through RVU23B, RVU23C, RVU23D.

  6. January 1, 2022

    RVU22A

    $501.03changed to$563.99

    • Conversion factor 34.8931 changed to 34.6062
    • Practice expense RVU 12.25 changed to 13.99

    Held through RVU22B, RVU22C, RVU22D.

  7. January 1, 2021

    RVU21A

    $392.43changed to$501.03

    • Conversion factor 36.0896 changed to 34.8931
    • Practice expense RVU 9.13 changed to 12.25
    • Work GPCI 1.029 changed to 1.037
    • Practice expense GPCI 1.113 changed to 1.114
    • Malpractice GPCI 1.094 changed to 0.934

    Held through RVU21B, RVU21C, RVU21D.

  8. January 1, 2020

    RVU20A

    $296.20changed to$392.43

    • Conversion factor 36.0391 changed to 36.0896
    • Practice expense RVU 6.74 changed to 9.13
    • Malpractice RVU 0.04 changed to 0.03
    • Work GPCI 1.021 changed to 1.029
    • Practice expense GPCI 1.112 changed to 1.113
    • Malpractice GPCI 1.255 changed to 1.094

    Held through RVU20B, RVU20C, RVU20D.

  9. January 1, 2019

    RVU19A

    $195.00changed to$296.20

    • Conversion factor 35.9996 changed to 36.0391
    • Practice expense RVU 4.22 changed to 6.74

    Held through RVU19B, RVU19C, RVU19D.

  10. January 1, 2018

    RVU18AR1

    $192.38changed to$195.00

    • Conversion factor 35.8887 changed to 35.9996
    • Practice expense RVU 4.15 changed to 4.22
    • Work GPCI 1.023 changed to 1.021
    • Practice expense GPCI 1.117 changed to 1.112
    • Malpractice GPCI 1.244 changed to 1.255

    Held through RVU18B, RVU18C, RVU18D.

  11. January 1, 2017

    RVU17A

    $192.53changed to$192.38

    • Conversion factor 35.8043 changed to 35.8887
    • Work GPCI 1.024 changed to 1.023
    • Practice expense GPCI 1.121 changed to 1.117
    • Malpractice GPCI 1.232 changed to 1.244

    Held through RVU17B, RVU17C, RVU17D.

  12. January 1, 2016

    RVU16A

    $194.80changed to$192.53

    • Conversion factor 35.9335 changed to 35.8043
    • Practice expense RVU 4.20 changed to 4.15
    • Malpractice RVU 0.03 changed to 0.04

    Held through RVU16B, RVU16C, RVU16D.

  13. July 1, 2015

    RVU15C

    $193.83changed to$194.80

    • Conversion factor 35.7547 changed to 35.9335

    Held through RVU15D.

  14. January 1, 2015

    RVU15A

    $199.53changed to$193.83

    • Conversion factor 35.8228 changed to 35.7547
    • Practice expense RVU 4.33 changed to 4.20
    • Malpractice RVU 0.05 changed to 0.03
    • Practice expense GPCI 1.116 changed to 1.121
    • Malpractice GPCI 1.234 changed to 1.232

    Held through RVU15B.

  15. January 1, 2014

    RVU14A

    $214.68changed to$199.53

    • Conversion factor 34.0230 changed to 35.8228
    • Practice expense RVU 5.02 changed to 4.33
    • Practice expense GPCI 1.110 changed to 1.116
    • Malpractice GPCI 1.235 changed to 1.234

    Held through RVU14B, RVU14C, RVU14D.

  16. January 1, 2013

    RVU13AR

    Earliest loaded release: $214.68

    Held through RVU13B, RVU13C, RVU13D.

Rates in every CMS release
Effective fromOfficeFacilityCMS release
2026-10-01$546.42Not available in this settingRVU26D
2026-07-01$546.42Not available in this settingRVU26C
2026-04-01$546.42Not available in this settingRVU26B
2026-01-01$546.42Not available in this settingRVU26A
2025-10-01$462.00Not available in this settingRVU25D
2025-07-01$462.00Not available in this settingRVU25C
2025-04-01$462.00Not available in this settingRVU25B
2025-01-01$462.00Not available in this settingRVU25A
2024-10-01$499.41Not available in this settingRVU24D
2024-07-01$499.41Not available in this settingRVU24C
2024-04-01$499.41Not available in this settingRVU24B
2024-03-09$499.41Not available in this settingRVU24AR
2024-01-01$491.26Not available in this settingRVU24A
2023-10-01$523.41Not available in this settingRVU23D
2023-07-01$523.41Not available in this settingRVU23C
2023-04-01$523.41Not available in this settingRVU23B
2023-01-01$523.41Not available in this settingRVU23A
2022-10-01$563.99Not available in this settingRVU22D
2022-07-01$563.99Not available in this settingRVU22C
2022-04-01$563.99Not available in this settingRVU22B
2022-01-01$563.99Not available in this settingRVU22A
2021-10-01$501.03Not available in this settingRVU21D
2021-07-01$501.03Not available in this settingRVU21C
2021-04-01$501.03Not available in this settingRVU21B
2021-01-01$501.03Not available in this settingRVU21A
2020-10-01$392.43Not available in this settingRVU20D
2020-07-01$392.43Not available in this settingRVU20C
2020-04-01$392.43Not available in this settingRVU20B
2020-01-01$392.43Not available in this settingRVU20A
2019-10-01$296.20Not available in this settingRVU19D
2019-07-01$296.20Not available in this settingRVU19C
2019-04-01$296.20Not available in this settingRVU19B
2019-01-01$296.20Not available in this settingRVU19A
2018-10-01$195.00Not available in this settingRVU18D
2018-07-01$195.00Not available in this settingRVU18C
2018-04-01$195.00Not available in this settingRVU18B
2018-01-01$195.00Not available in this settingRVU18AR1
2017-10-01$192.38Not available in this settingRVU17D
2017-07-01$192.38Not available in this settingRVU17C
2017-04-01$192.38Not available in this settingRVU17B
2017-01-01$192.38Not available in this settingRVU17A
2016-10-01$192.53Not available in this settingRVU16D
2016-07-01$192.53Not available in this settingRVU16C
2016-04-01$192.53Not available in this settingRVU16B
2016-01-01$192.53Not available in this settingRVU16A
2015-10-01$194.80Not available in this settingRVU15D
2015-07-01$194.80Not available in this settingRVU15C
2015-04-01$193.83Not available in this settingRVU15B
2015-01-01$193.83Not available in this settingRVU15A
2014-10-01$199.53Not available in this settingRVU14D
2014-07-01$199.53Not available in this settingRVU14C
2014-04-01$199.53Not available in this settingRVU14B
2014-01-01$199.53Not available in this settingRVU14A
2013-10-01$214.68Not available in this settingRVU13D
2013-07-01$214.68Not available in this settingRVU13C
2013-04-01$214.68Not available in this settingRVU13B
2013-01-01$214.68Not available in this settingRVU13AR

Price 91133 for an earlier date of service

Where the Connecticut rate applies

Connecticut is a Medicare payment area, not a city. Our Census mapping connects it to 215 cities and communities in Connecticut. Some span more than one payment area; confirm with the service ZIP.

  • Ansonia
  • Ball Pond
  • Baltic
  • Bantam
  • Bethel
  • Bethlehem Village
  • Bigelow Corners
  • Blue Hills

Browse all communities in Connecticut

91133 billing questions

How does 91133 differ from 91132?

91133 includes electrogastrography with a test or challenge, commonly a meal challenge. 91132 represents electrogastrography without that test component.

Can the professional and technical portions be billed separately?

Yes. Modifier 26 identifies the professional interpretation, and modifier TC identifies the technical portion involving equipment and staff. Without either modifier, the claim represents the global service.

What documentation supports reporting 91133?

Record the reason for testing, the challenge performed, the recording conditions, and the interpretation of the gastric electrical findings.

Is a meal challenge required for 91133?

The service includes a test or challenge; a meal is a common example. The documentation should identify the test actually 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

Show the CMS file lines behind this rate
RVUs for 91133PPRRVU2026_Oct_nonQPP.csv, line 11,643 (RVU26D)
Geographic factors for ConnecticutGPCI2026.csv, line 38 (RVU26D)

Open CMS sourceHow we calculate rates

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