CPT code 51797: Abdominal pressure test, urodynamic add-on measurement2026 Medicare rate & RVUs in Texas
Measures intra-abdominal pressure during urodynamic testing, typically alongside complex cystometrogram studies that assess bladder pressure during filling and voiding.
Medicare pays $143.42–$162.11 for 51797 in the office in Texas, from Beaumont, TX to Austin, TX. Which amount applies depends on the service address.
Medicare allowed amount for participating (non-QP) physicians, before deductible, coinsurance and claim adjustments. Not a patient’s bill or a hospital charge.
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On this page 9 sections
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.
Where 51797 pays more and less in Texas
The same RVUs, adjusted for each area’s costs. Open a locality for its calculation, history and nearby areas.
8 payment localities
$143.42 to $162.11
8 of 8 payment localities
| Payment locality | Office | Facility |
|---|---|---|
| Austin, TX | $162.11 | Unavailable |
| Beaumont, TX | $143.42 | Unavailable |
| Brazoria, TX | $153.53 | Unavailable |
| Dallas, TX | $154.38 | Unavailable |
| Fort Worth, TX | $153.14 | Unavailable |
| Galveston, TX | $153.90 | Unavailable |
| Houston, TX | $155.18 | Unavailable |
| Rest of Texas | $148.30 | Unavailable |
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
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.
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
| Rule | CMS value | What it means |
|---|---|---|
| Global period | ZZZ | Add-on code: falls within the primary procedure’s global period. |
| 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
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.
51797 compared with similar codes
Compare codes · National
4 codes, side by side
How to choose
- 51728Urodynamic studyWith voiding pressure
- 51728 reports the complex cystometrogram with voiding pressure studies; 51797 separately identifies the intra-abdominal pressure measurement as an add-on when performed.
- 51729Urodynamic studyVoiding and urethral pressures
- 51729 is the primary complex cystometrogram code when leak point pressure studies are included. 51797 reports the intra-abdominal pressure measurement alongside the primary study.
- 51726CystometrogramElectronic pressure-volume testing
- 51726 reports a complex cystometrogram without the voiding pressure study focus of 51728. 51797 is an add-on measurement, not a substitute for the primary cystometrogram code.
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
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