$1,621.12
Choose 91117 for prolonged manometric assessment of colonic motor activity; 91112 uses a wireless capsule to measure gastrointestinal transit and pressure.
On this page
CMS RVU26D · Effective 2026-10-01
91117 Colon motility Medicare reimbursement rates in Iowa
Reports prolonged colonic pressure monitoring used to evaluate suspected colon motility disorders, including severe or treatment-resistant constipation. Compare 91117 office and facility rates across CMS payment localities in Iowa.
Amounts below use the non-QP conversion factor for participating physicians. These are base physician payments before claim-level adjustments, not patient costs or total hospital charges.
What does Medicare pay for 91117 in Iowa?
Iowa has 1 payment locality in this comparison. Use the service location to choose the applicable amount. These are the supported base rates for the payment area shown below, using the same CMS release.
Office / nonfacility
No supported rate
Facility setting
$115.22
1 of 1 localities have a supported rate.
Payment area: Iowa
One mapped payment locality.
These are locality ranges, not averages or address-specific quotes. A facility-setting amount covers the physician service; it does not include a hospital’s separate bill. Choose a locality below to inspect its calculation, compare other payment areas, or price a percentage of Medicare.
Gastrointestinal motility
About 91117: Prolonged colonic motility study
Reports prolonged colonic pressure monitoring used to evaluate suspected colon motility disorders, including severe or treatment-resistant constipation.
This service is an extended manometric assessment of colonic motor activity, with pressure data interpreted and reported. Gastroenterologists and other clinicians specializing in gastrointestinal motility typically perform or interpret it in a setting equipped for prolonged physiologic monitoring. It can help evaluate suspected colonic dysmotility in patients with persistent constipation when a focused assessment of colon function is needed.
Select this code for the prolonged colon motility study, rather than a study that measures transit with a wireless capsule or evaluates anorectal function. The record should identify the study performed, its duration, and the interpreted findings supporting the assessment. The 0-day global period includes same-day preoperative and postoperative care. Modifier 50 is not appropriate for this single-colon study. Medicare assistant-at-surgery payment requires documented medical necessity; co-surgeons and team surgery are not permitted.
CMS billing rules for 91117
- Global period
- Minor procedure with a 0-day global period: same-day preoperative and postoperative care is included.
- Bilateral procedures
- Bilateral adjustment does not apply; the descriptor or anatomy makes modifier 50 inappropriate.
- Assistant at surgery
- Assistant at surgery is paid only with documentation of medical necessity.
- Co-surgeons
- Co-surgeons not permitted.
- Team surgery
- Team surgery not permitted.
Where the value comes from
- Work RVU2.39 · 65%
- Practice expense (office) RVU1.08 · 30%
- Malpractice RVU0.18 · 5%
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.
91117 compared with similar codes
Office rates for Iowa, from the same CMS release.
$708.08
91124 evaluates anorectal sensation, tone, and compliance. It is not the prolonged colonic motility study reported with 91117.
$322.57
91125 is anorectal manometry with rectal sensation and balloon expulsion testing; 91117 assesses colonic motility over an extended study.
Compare 91117 by payment locality
Find the payment area for your service address, then open its rate page for calculation inputs, release history and the percentage-of-Medicare tool. A city may cross payment-area boundaries; the ZIP lookup above helps resolve the location.
1 of 1 payment localities
Iowa →
Office / nonfacility
Unavailable
Facility
$115.22
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How this local rate is calculated
Each RVU component is multiplied by its own geographic practice cost index (GPCI). The three adjusted components are added, then multiplied by the conversion factor. These are the inputs used for 91117 in Iowa.
PPRRVU2026_Oct_nonQPP.csv
11,633
- Code
- 91117
- Physician work
- 2.39
- Practice expense
- 1.08
- Malpractice
- 0.18
GPCI2026.csv
53
- Locality
- Iowa
- Physician work
- 1.000
- Practice expense
- 0.915
- Malpractice
- 0.397
| Component | RVU | Locality factor | Adjusted |
|---|---|---|---|
| Physician work | 2.39 | × 1.000 | 2.3900 |
| Practice expense | 1.08 | × 0.915 | 0.9882 |
| Malpractice | 0.18 | × 0.397 | 0.0715 |
| Total RVUs | 3.4497 | ||
| Conversion factor | × 33.4009 | ||
Facility rate, Iowa$115.22
Explore RVUs, geographic factors and the full formula
Facility
| Component | RVU | Local GPCI |
|---|---|---|
| Work | 2.39 | 1 |
| Practice expense | 1.08 | 0.915 |
| Malpractice | 0.18 | 0.397 |
(2.39 × 1 + 1.08 × 0.915 + 0.18 × 0.397) × $33.4009 = $115.22
The office and facility calculations use their respective practice-expense RVUs. The facility amount here is the physician fee, not a separate hospital or facility bill.
91117 billing questions
How does this differ from a wireless capsule study?
91117 reports prolonged manometric assessment of colonic motor activity. 91112 measures gastrointestinal transit and pressure using a wireless capsule.
Can the interpretation be billed separately?
The reported service includes interpretation and a report. The documentation should support the findings reported as part of the study.
Should modifier 50 be used?
No. Modifier 50 is not appropriate for this single-colon study.
What documentation supports reporting 91117?
Document the prolonged colonic motility study, its duration, and the interpreted pressure findings. A brief or different type of gastrointestinal function test does not establish this service.
How does this differ from anorectal testing?
91117 assesses colonic motility. Codes 91124 and 91125 concern anorectal function, including rectal sensation or manometry-related testing.
Where these rates come from
FeeBase calculates base physician payments from CMS work, practice-expense, and malpractice RVUs, adjusted by each locality’s geographic indices and the applicable conversion factor. Unavailable or separately priced services are labeled rather than assigned a made-up amount.
Source: RVU26D. Effective 2026-10-01 through the day before 2027-01-01.
11,63091113,,Gi trc img intral colon i&r,A,,2.35,27.05,,27.05,NA,0.10,29.50,29.50,1,XXX,0.00,0.00,0.00,0,0,0,0,0,9,,33.4009,09,0,99,29.80,29.80,0.10
11,63191113,26,Gi trc img intral colon i&r,A,,2.35,1.38,,1.38,,0.08,3.81,3.81,1,XXX,0.00,0.00,0.00,0,0,0,0,0,9,,33.4009,09,0,99,0.00,0.00,0.00
11,63291113,TC,Gi trc img intral colon i&r,A,,0.00,25.67,,25.67,NA,0.02,25.69,25.69,1,XXX,0.00,0.00,0.00,0,0,0,0,0,9,,33.4009,09,0,99,28.42,28.42,0.02
11,63391117,,Colon motility 6 hr study,A,,2.39,1.08,NA,1.08,,0.18,3.65,3.65,0,000,0.00,0.00,0.00,0,0,0,0,0,9,,33.4009,09,0,99,0.00,0.00,0.00
11,63491124,,Rct snsatn tone&cmplianc std,A,,3.05,19.74,,19.74,NA,0.22,23.01,23.01,1,XXX,0.00,0.00,0.00,0,0,0,0,0,9,,33.4009,09,0,99,0.00,0.00,0.00
11,63591124,26,Rct snsatn tone&cmplianc std,A,,3.05,1.67,,1.67,,0.18,4.90,4.90,1,XXX,0.00,0.00,0.00,0,0,0,0,0,9,,33.4009,09,0,99,0.00,0.00,0.00
11,63691124,TC,Rct snsatn tone&cmplianc std,A,,0.00,18.07,,18.07,NA,0.04,18.11,18.11,1,XXX,0.00,0.00,0.00,0,0,0,0,0,9,,33.4009,02,0,99,0.00,0.00,0.00
5006102,IL,15,SUBURBAN CHICAGO,1.007,1.027,1.772
5106102,IL,99,REST OF ILLINOIS,1.000,0.913,1.563
5208102,IN,00,INDIANA,1.000,0.927,0.486
5305102,IA,00,IOWA,1.000,0.915,0.397
5405202,KS,00,KANSAS,1.000,0.904,0.504
5515102,KY,00,KENTUCKY,1.000,0.889,0.915
5607202,LA,01,NEW ORLEANS,1.000,0.941,1.136