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

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 Delaware, Medicare pays $502.54 for 91133 in the office.

$502.54Office (non-facility)
Not available in this settingHospital or facility
−1.1%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 Delaware
  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 Delaware 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. Delaware pays $502.54. The RVUs are the same everywhere; the geographic indexes change the dollars.

91133 in Delaware vs other payment areas
  1. Delaware · this page$502.54
  2. Los Angeles, CA · California$597.84+$95.30
  3. Washington, DC area · District of Columbia$596.13+$93.59
  4. Miami, FL · Florida$529.82+$27.28
  5. Chicago, IL · Illinois$512.24+$9.70
  6. Manhattan, NY · New York$589.05+$86.51
  7. Alaska · Alaska$550.19+$47.65

Other areas in Delaware 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 Delaware 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

40

Locality
Delaware
Physician work
1.005
Practice expense
0.988
Malpractice
0.899
Office calculation for 91133 in Delaware
ComponentRVULocality factorAdjusted
Physician work0.64× 1.0050.6432
Practice expense14.55× 0.98814.3754
Malpractice0.03× 0.8990.0270
Total RVUs15.0456
Conversion factor× 33.4009

Office rate, Delaware$502.54

Office: (0.64 × 1.005 + 14.55 × 0.988 + 0.03 × 0.899) × $33.4009 = $502.54

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, Delaware
Same family
91132Electrogastrography, without testElectrogastrography without the test component.$480.02
Used instead
91112Motility capsule, transit and pressure measurementWireless gastrointestinal transit and pressure measurement evaluates transit rather than gastric electrical activity.$1,746.90
78264Gastric emptying, stomach onlyGastric emptying scintigraphy assesses emptying by imaging rather than measuring gastric electrical signals.$286.61

How 91133 has changed in Delaware

91133 · Office / nonfacility

$502.54

Effective 2026-10-01

The base rate is $80.91 higher than on 2025-10-01, moving from $421.63 to $502.54 (19.2%).

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

    $421.63changed to$502.54

    • 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 1.009 changed to 1.005
    • Practice expense GPCI 0.992 changed to 0.988
    • Malpractice GPCI 0.949 changed to 0.899

    Held through RVU26B, RVU26C, RVU26D.

  2. January 1, 2025

    RVU25A

    $455.69changed to$421.63

    • 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

    $448.26changed to$455.69

    • Conversion factor 32.7442 changed to 33.2875

    Held through RVU24B, RVU24C, RVU24D.

  4. January 1, 2024

    RVU24A

    $479.72changed to$448.26

    • Conversion factor 33.8872 changed to 32.7442
    • Practice expense RVU 13.37 changed to 13.10
    • Work GPCI 1.007 changed to 1.009
    • Practice expense GPCI 1.007 changed to 0.992
    • Malpractice GPCI 0.938 changed to 0.949

  5. January 1, 2023

    RVU23A

    $518.71changed to$479.72

    • Conversion factor 34.6062 changed to 33.8872
    • Practice expense RVU 13.99 changed to 13.37
    • Work GPCI 1.005 changed to 1.007
    • Practice expense GPCI 1.022 changed to 1.007
    • Malpractice GPCI 0.927 changed to 0.938

    Held through RVU23B, RVU23C, RVU23D.

  6. January 1, 2022

    RVU22A

    $460.96changed to$518.71

    • 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

    $361.49changed to$460.96

    • Conversion factor 36.0896 changed to 34.8931
    • Practice expense RVU 9.13 changed to 12.25
    • Work GPCI 1.006 changed to 1.005
    • Practice expense GPCI 1.021 changed to 1.022
    • Malpractice GPCI 1.023 changed to 0.927

    Held through RVU21B, RVU21C, RVU21D.

  8. January 1, 2020

    RVU20A

    $273.08changed to$361.49

    • 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 1.007 changed to 1.006
    • Practice expense GPCI 1.019 changed to 1.021
    • Malpractice GPCI 1.119 changed to 1.023

    Held through RVU20B, RVU20C, RVU20D.

  9. January 1, 2019

    RVU19A

    $180.34changed to$273.08

    • 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

    $178.17changed to$180.34

    • Conversion factor 35.8887 changed to 35.9996
    • Practice expense RVU 4.15 changed to 4.22
    • Work GPCI 1.010 changed to 1.007
    • Practice expense GPCI 1.025 changed to 1.019
    • Malpractice GPCI 1.101 changed to 1.119

    Held through RVU18B, RVU18C, RVU18D.

  11. January 1, 2017

    RVU17A

    $178.66changed to$178.17

    • Conversion factor 35.8043 changed to 35.8887
    • Work GPCI 1.012 changed to 1.010
    • Practice expense GPCI 1.031 changed to 1.025
    • Malpractice GPCI 1.083 changed to 1.101

    Held through RVU17B, RVU17C, RVU17D.

  12. January 1, 2016

    RVU16A

    $180.77changed to$178.66

    • 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

    $179.87changed to$180.77

    • Conversion factor 35.7547 changed to 35.9335

    Held through RVU15D.

  14. January 1, 2015

    RVU15A

    $186.51changed to$179.87

    • 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 1.038 changed to 1.031
    • Malpractice GPCI 0.878 changed to 1.083

    Held through RVU15B.

  15. January 1, 2014

    RVU14A

    $202.18changed to$186.51

    • Conversion factor 34.0230 changed to 35.8228
    • Practice expense RVU 5.02 changed to 4.33
    • Practice expense GPCI 1.044 changed to 1.038
    • Malpractice GPCI 0.672 changed to 0.878

    Held through RVU14B, RVU14C, RVU14D.

  16. January 1, 2013

    RVU13AR

    Earliest loaded release: $202.18

    Held through RVU13B, RVU13C, RVU13D.

Rates in every CMS release
Effective fromOfficeFacilityCMS release
2026-10-01$502.54Not available in this settingRVU26D
2026-07-01$502.54Not available in this settingRVU26C
2026-04-01$502.54Not available in this settingRVU26B
2026-01-01$502.54Not available in this settingRVU26A
2025-10-01$421.63Not available in this settingRVU25D
2025-07-01$421.63Not available in this settingRVU25C
2025-04-01$421.63Not available in this settingRVU25B
2025-01-01$421.63Not available in this settingRVU25A
2024-10-01$455.69Not available in this settingRVU24D
2024-07-01$455.69Not available in this settingRVU24C
2024-04-01$455.69Not available in this settingRVU24B
2024-03-09$455.69Not available in this settingRVU24AR
2024-01-01$448.26Not available in this settingRVU24A
2023-10-01$479.72Not available in this settingRVU23D
2023-07-01$479.72Not available in this settingRVU23C
2023-04-01$479.72Not available in this settingRVU23B
2023-01-01$479.72Not available in this settingRVU23A
2022-10-01$518.71Not available in this settingRVU22D
2022-07-01$518.71Not available in this settingRVU22C
2022-04-01$518.71Not available in this settingRVU22B
2022-01-01$518.71Not available in this settingRVU22A
2021-10-01$460.96Not available in this settingRVU21D
2021-07-01$460.96Not available in this settingRVU21C
2021-04-01$460.96Not available in this settingRVU21B
2021-01-01$460.96Not available in this settingRVU21A
2020-10-01$361.49Not available in this settingRVU20D
2020-07-01$361.49Not available in this settingRVU20C
2020-04-01$361.49Not available in this settingRVU20B
2020-01-01$361.49Not available in this settingRVU20A
2019-10-01$273.08Not available in this settingRVU19D
2019-07-01$273.08Not available in this settingRVU19C
2019-04-01$273.08Not available in this settingRVU19B
2019-01-01$273.08Not available in this settingRVU19A
2018-10-01$180.34Not available in this settingRVU18D
2018-07-01$180.34Not available in this settingRVU18C
2018-04-01$180.34Not available in this settingRVU18B
2018-01-01$180.34Not available in this settingRVU18AR1
2017-10-01$178.17Not available in this settingRVU17D
2017-07-01$178.17Not available in this settingRVU17C
2017-04-01$178.17Not available in this settingRVU17B
2017-01-01$178.17Not available in this settingRVU17A
2016-10-01$178.66Not available in this settingRVU16D
2016-07-01$178.66Not available in this settingRVU16C
2016-04-01$178.66Not available in this settingRVU16B
2016-01-01$178.66Not available in this settingRVU16A
2015-10-01$180.77Not available in this settingRVU15D
2015-07-01$180.77Not available in this settingRVU15C
2015-04-01$179.87Not available in this settingRVU15B
2015-01-01$179.87Not available in this settingRVU15A
2014-10-01$186.51Not available in this settingRVU14D
2014-07-01$186.51Not available in this settingRVU14C
2014-04-01$186.51Not available in this settingRVU14B
2014-01-01$186.51Not available in this settingRVU14A
2013-10-01$202.18Not available in this settingRVU13D
2013-07-01$202.18Not available in this settingRVU13C
2013-04-01$202.18Not available in this settingRVU13B
2013-01-01$202.18Not available in this settingRVU13AR

Price 91133 for an earlier date of service

Where the Delaware rate applies

Delaware is a Medicare payment area, not a city. Our Census mapping connects it to 79 cities and communities in Delaware. Some span more than one payment area; confirm with the service ZIP.

  • Arden
  • Ardencroft
  • Ardentown
  • Bear
  • Bellefonte
  • Bethany Beach
  • Bethel
  • Blades

Browse all communities in Delaware

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 DelawareGPCI2026.csv, line 40 (RVU26D)

Open CMS sourceHow we calculate rates

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