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CPT code 51797: Abdominal pressure test, urodynamic add-on measurement2026 Medicare rate & RVUs in Washington, DC area

Measures intra-abdominal pressure during urodynamic testing, typically alongside complex cystometrogram studies that assess bladder pressure during filling and voiding.

CMS RVU26DEffective Oct 1, 2026One payment locality96.4K Medicare services in 2024

In Washington, DC area, Medicare pays $179.18 for 51797 in the office.

$179.18Office (non-facility)
Not available in this settingHospital or facility
+15.6%vs the national office rate ($154.98)

Check a contract rate as a % of Medicare · 51797 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 51797 for the payment locality that covers the ZIP.

On this page 11 sections
  1. Rate in Washington, DC area
  2. What 51797 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 51797 covers

This add-on captures intra-abdominal pressure during urodynamic evaluation, commonly through a rectal pressure catheter or balloon while bladder pressure is recorded. Comparing abdominal and bladder pressure helps the clinician assess detrusor pressure during filling and voiding. Urologists and other clinicians who perform urodynamic studies use it in office or facility settings for patients evaluated for urinary retention, incontinence, or other lower urinary tract symptoms.

Report 51797 only with a primary procedure, commonly 51728 or 51729, when the abdominal-pressure measurement is performed; it is not a stand-alone service. The record should identify the measurement method, include the pressure data, and support its role in the study. CMS treats payment for this add-on as within the primary procedure's global period. The service may be billed globally without a modifier or split between interpretation (modifier 26) and equipment and staff (modifier TC); CMS separately prices both component modifiers.

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 Washington, DC area compares for 51797

Across 109 of 109 payment localities, the office rate for 51797 runs from $136.00 in Arkansas to $212.71 in San Benito County, CA. Washington, DC area pays $179.18. The RVUs are the same everywhere; the geographic indexes change the dollars.

51797 in Washington, DC area vs other payment areas
  1. Washington, DC area · this page$179.18
  2. Los Angeles, CA · California$178.43−$0.75
  3. Miami, FL · Florida$163.75−$15.43
  4. Chicago, IL · Illinois$158.82−$20.36
  5. Manhattan, NY · New York$178.53−$0.65
  6. Alaska · Alaska$175.19−$3.99
  7. Alabama · Alabama$138.14−$41.04

Other areas in District of Columbia first, then benchmark localities. Bars start at $0.

Every other payment area

51797 in every other Medicare payment locality
Payment localityOfficeFacility
ArkansasArkansas$136.00—
ArizonaArizona$150.72—
Bakersfield, CACalifornia$166.71—
Chico, CACalifornia$166.49—
El Centro, CACalifornia$166.50—
Fresno, CACalifornia$166.49—
Hanford, CACalifornia$166.49—
Madera, CACalifornia$166.49—

51797 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.

$136.00

$189.60

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

View every state and territory as a table
51797 office rate range by state
State / territoryOffice rate rangeLocalities
AK$175.191
AL$138.141
AR$136.001
AZ$150.721
CA$166.49–$212.7129
CO$162.881
CT$165.741
DC$179.181
DE$153.361
FL$150.59–$163.753
GA$141.76–$157.552
GU$171.341
HI$171.341
IA$142.811
ID$143.621
IL$145.28–$160.394
IN$144.541
KS$141.671
KY$140.731
LA$140.32–$147.832
MA$161.63–$180.352
MD$156.57–$179.183
ME$143.97–$152.982
MI$144.27–$152.152
MN$157.011
MO$137.45–$148.913
MS$136.771
MT$154.981
NC$145.651
ND$153.591
NE$143.781
NH$159.881
NJ$167.90–$177.032
NM$144.941
NV$154.721
NY$147.96–$182.585
OH$143.991
OK$140.911
OR$153.78–$168.852
PA$144.47–$161.092
PR$156.341
RI$159.401
SC$145.011
SD$153.431
TN$142.381
TX$143.42–$162.118
UT$147.151
VA$152.14–$179.182
VI$156.341
VT$152.561
WA$161.47–$184.592
WI$148.051
WV$139.401
WY$154.371

See 51797 in every payment locality

How the 51797 rate is calculated

Each of 51797’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 · 51797

RVUs × geographic indexes × conversion factor

Office or facility?

Work0.78

0.78 RVUs× 1.000 GPCI

Practice expense3.79

3.79 RVUs× 1.000 GPCI

Malpractice0.07

0.07 RVUs× 1.000 GPCI

Adjusted RVUs

4.6400

Conversion factor

$33.4009

Medicare rate

$154.98

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

The exact Washington, DC area inputs and CMS source lines

PPRRVU2026_Oct_nonQPP.csv

6,084

Code
51797
Physician work
0.78
Practice expense
3.79
Malpractice
0.07

GPCI2026.csv

39

Locality
Washington, DC area
Physician work
1.054
Practice expense
1.178
Malpractice
1.113
Office calculation for 51797 in Washington, DC area
ComponentRVULocality factorAdjusted
Physician work0.78× 1.0540.8221
Practice expense3.79× 1.1784.4646
Malpractice0.07× 1.1130.0779
Total RVUs5.3647
Conversion factor× 33.4009

Office rate, Washington, DC area$179.18

Office: (0.78 × 1.054 + 3.79 × 1.178 + 0.07 × 1.113) × $33.4009 = $179.18

Open 51797 in the RVU calculator

Payment rules and modifiers for 51797

The CMS indicators that decide how 51797 is paid alongside other services.

CMS payment indicators · 51797

Abdominal pressure test, urodynamic add-on measurement

RuleCMS valueWhat it means
Global periodZZZAdd-on code: falls within the primary procedure’s global period.
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

51797 without 26 · national office

$154.98

Abdominal pressure test, urodynamic add-on measurement

51797-26 · Professional component

$39.41

Pays only the interpretation and report.

When to use modifier 26

Codes related to 51797

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

Codes related to 51797
CodeHow it relatesOffice range, Washington, DC area
Primary code
51728Urodynamic study, with voiding pressureCommon primary complex cystometrogram pairing for this abdominal-pressure measurement.$387.60
51729Urodynamic study, voiding and urethral pressuresCommon primary complex cystometrogram pairing when leak point pressure studies are included.$406.25
Same family
51726Cystometrogram, electronic pressure-volume testingComplex cystometrogram in the same urodynamic testing family.$311.81
51727Urodynamic testing, with urethral pressure profileComplex cystometrogram with urethral pressure profile studies.$380.83

How 51797 has changed in Washington, DC area

51797 · Office / nonfacility

$179.18

Effective 2026-10-01

The base rate is $9.29 lower than on 2025-10-01, moving from $188.47 to $179.18 (4.9%).

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

    $188.47changed to$179.18

    • Conversion factor 32.3465 changed to 33.4009
    • Work RVU 0.80 changed to 0.78
    • Practice expense RVU 4.11 changed to 3.79
    • Work GPCI 1.057 changed to 1.054
    • Practice expense GPCI 1.192 changed to 1.178
    • Malpractice GPCI 1.168 changed to 1.113

    Held through RVU26B, RVU26C, RVU26D.

  2. January 1, 2025

    RVU25A

    $221.32changed to$188.47

    • Conversion factor 33.2875 changed to 32.3465
    • Practice expense RVU 4.79 changed to 4.11
    • Malpractice RVU 0.08 changed to 0.07

    Held through RVU25B, RVU25C, RVU25D.

  3. March 9, 2024

    RVU24AR

    $217.71changed to$221.32

    • Conversion factor 32.7442 changed to 33.2875

    Held through RVU24B, RVU24C, RVU24D.

  4. January 1, 2024

    RVU24A

    $233.55changed to$217.71

    • Conversion factor 33.8872 changed to 32.7442
    • Practice expense RVU 4.90 changed to 4.79
    • Work GPCI 1.056 changed to 1.057
    • Practice expense GPCI 1.214 changed to 1.192
    • Malpractice GPCI 1.231 changed to 1.168

  5. January 1, 2023

    RVU23A

    $248.34changed to$233.55

    • Conversion factor 34.6062 changed to 33.8872
    • Practice expense RVU 5.04 changed to 4.90
    • Work GPCI 1.054 changed to 1.056
    • Practice expense GPCI 1.236 changed to 1.214
    • Malpractice GPCI 1.294 changed to 1.231

    Held through RVU23B, RVU23C, RVU23D.

  6. January 1, 2022

    RVU22A

    $233.11changed to$248.34

    • Conversion factor 34.8931 changed to 34.6062
    • Practice expense RVU 4.66 changed to 5.04
    • Malpractice RVU 0.06 changed to 0.08

    Held through RVU22B, RVU22C, RVU22D.

  7. January 1, 2021

    RVU21A

    $198.34changed to$233.11

    • Conversion factor 36.0896 changed to 34.8931
    • Practice expense RVU 3.73 changed to 4.66
    • Malpractice RVU 0.08 changed to 0.06
    • Work GPCI 1.049 changed to 1.054
    • Practice expense GPCI 1.221 changed to 1.236
    • Malpractice GPCI 1.277 changed to 1.294

    Held through RVU21B, RVU21C, RVU21D.

  8. January 1, 2020

    RVU20A

    $167.07changed to$198.34

    • Conversion factor 36.0391 changed to 36.0896
    • Practice expense RVU 3.08 changed to 3.73
    • Malpractice RVU 0.07 changed to 0.08
    • Work GPCI 1.045 changed to 1.049
    • Practice expense GPCI 1.205 changed to 1.221
    • Malpractice GPCI 1.261 changed to 1.277

    Held through RVU20B, RVU20C, RVU20D.

  9. January 1, 2019

    RVU19A

    $136.08changed to$167.07

    • Conversion factor 35.9996 changed to 36.0391
    • Practice expense RVU 2.37 changed to 3.08

    Held through RVU19B, RVU19C, RVU19D.

  10. January 1, 2018

    RVU18AR1

    $133.18changed to$136.08

    • Conversion factor 35.8887 changed to 35.9996
    • Practice expense RVU 2.31 changed to 2.37
    • Work GPCI 1.048 changed to 1.045
    • Malpractice GPCI 1.271 changed to 1.261

    Held through RVU18B, RVU18C, RVU18D.

  11. January 1, 2017

    RVU17A

    $132.11changed to$133.18

    • Conversion factor 35.8043 changed to 35.8887
    • Practice expense RVU 2.29 changed to 2.31
    • Work GPCI 1.051 changed to 1.048
    • Malpractice GPCI 1.280 changed to 1.271

    Held through RVU17B, RVU17C, RVU17D.

  12. January 1, 2016

    RVU16A

    $132.59changed to$132.11

    • Conversion factor 35.9335 changed to 35.8043

    Held through RVU16B, RVU16C, RVU16D.

  13. July 1, 2015

    RVU15C

    $131.93changed to$132.59

    • Conversion factor 35.7547 changed to 35.9335

    Held through RVU15D.

  14. January 1, 2015

    RVU15A

    $129.56changed to$131.93

    • Conversion factor 35.8228 changed to 35.7547
    • Practice expense RVU 2.25 changed to 2.29
    • Malpractice RVU 0.06 changed to 0.07
    • Work GPCI 1.050 changed to 1.051
    • Practice expense GPCI 1.202 changed to 1.205
    • Malpractice GPCI 1.205 changed to 1.280

    Held through RVU15B.

  15. January 1, 2014

    RVU14A

    $131.94changed to$129.56

    • Conversion factor 34.0230 changed to 35.8228
    • Practice expense RVU 2.48 changed to 2.25
    • Work GPCI 1.049 changed to 1.050
    • Practice expense GPCI 1.198 changed to 1.202
    • Malpractice GPCI 1.130 changed to 1.205

    Held through RVU14B, RVU14C, RVU14D.

  16. January 1, 2013

    RVU13AR

    Earliest loaded release: $131.94

    Held through RVU13B, RVU13C, RVU13D.

Rates in every CMS release
Effective fromOfficeFacilityCMS release
2026-10-01$179.18Not available in this settingRVU26D
2026-07-01$179.18Not available in this settingRVU26C
2026-04-01$179.18Not available in this settingRVU26B
2026-01-01$179.18Not available in this settingRVU26A
2025-10-01$188.47Not available in this settingRVU25D
2025-07-01$188.47Not available in this settingRVU25C
2025-04-01$188.47Not available in this settingRVU25B
2025-01-01$188.47Not available in this settingRVU25A
2024-10-01$221.32Not available in this settingRVU24D
2024-07-01$221.32Not available in this settingRVU24C
2024-04-01$221.32Not available in this settingRVU24B
2024-03-09$221.32Not available in this settingRVU24AR
2024-01-01$217.71Not available in this settingRVU24A
2023-10-01$233.55Not available in this settingRVU23D
2023-07-01$233.55Not available in this settingRVU23C
2023-04-01$233.55Not available in this settingRVU23B
2023-01-01$233.55Not available in this settingRVU23A
2022-10-01$248.34Not available in this settingRVU22D
2022-07-01$248.34Not available in this settingRVU22C
2022-04-01$248.34Not available in this settingRVU22B
2022-01-01$248.34Not available in this settingRVU22A
2021-10-01$233.11Not available in this settingRVU21D
2021-07-01$233.11Not available in this settingRVU21C
2021-04-01$233.11Not available in this settingRVU21B
2021-01-01$233.11Not available in this settingRVU21A
2020-10-01$198.34Not available in this settingRVU20D
2020-07-01$198.34Not available in this settingRVU20C
2020-04-01$198.34Not available in this settingRVU20B
2020-01-01$198.34Not available in this settingRVU20A
2019-10-01$167.07Not available in this settingRVU19D
2019-07-01$167.07Not available in this settingRVU19C
2019-04-01$167.07Not available in this settingRVU19B
2019-01-01$167.07Not available in this settingRVU19A
2018-10-01$136.08Not available in this settingRVU18D
2018-07-01$136.08Not available in this settingRVU18C
2018-04-01$136.08Not available in this settingRVU18B
2018-01-01$136.08Not available in this settingRVU18AR1
2017-10-01$133.18Not available in this settingRVU17D
2017-07-01$133.18Not available in this settingRVU17C
2017-04-01$133.18Not available in this settingRVU17B
2017-01-01$133.18Not available in this settingRVU17A
2016-10-01$132.11Not available in this settingRVU16D
2016-07-01$132.11Not available in this settingRVU16C
2016-04-01$132.11Not available in this settingRVU16B
2016-01-01$132.11Not available in this settingRVU16A
2015-10-01$132.59Not available in this settingRVU15D
2015-07-01$132.59Not available in this settingRVU15C
2015-04-01$131.93Not available in this settingRVU15B
2015-01-01$131.93Not available in this settingRVU15A
2014-10-01$129.56Not available in this settingRVU14D
2014-07-01$129.56Not available in this settingRVU14C
2014-04-01$129.56Not available in this settingRVU14B
2014-01-01$129.56Not available in this settingRVU14A
2013-10-01$131.94Not available in this settingRVU13D
2013-07-01$131.94Not available in this settingRVU13C
2013-04-01$131.94Not available in this settingRVU13B
2013-01-01$131.94Not available in this settingRVU13AR

Price 51797 for an earlier date of service

Where the Washington, DC area rate applies

Washington, DC area is a Medicare payment area, not a city. Our Census mapping connects it to 1 cities and communities in District of Columbia. Some span more than one payment area; confirm with the service ZIP.

  • Washington

Browse all communities in District of Columbia

51797 billing questions

Can 51797 be billed by itself?

No. It is an add-on and must be reported with a primary procedure, commonly 51728 or 51729, when intra-abdominal pressure is measured.

How does 51797 differ from 51728?

51728 reports a complex cystometrogram with voiding pressure studies. 51797 is the add-on for the intra-abdominal pressure measurement performed as part of the study.

What documentation supports 51797?

Document the pressure-measurement method, the recorded abdominal-pressure data, and how the measurement relates to the urodynamic study.

Can the professional and technical portions be billed separately?

Yes. Modifier 26 identifies the interpretation, and modifier TC identifies the equipment and staff portion. Billing without a modifier represents the global service.

Which primary procedures are commonly paired with 51797?

It is commonly reported with 51728 or 51729 when the study includes intra-abdominal pressure measurement. Select the primary procedure based on the urodynamic services 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 51797PPRRVU2026_Oct_nonQPP.csv, line 6,084 (RVU26D)
Geographic factors for Washington, DC areaGPCI2026.csv, line 39 (RVU26D)

Open CMS sourceHow we calculate rates

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