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CPT code 91117: Colon motility, six-hour study2026 Medicare rate & RVUs

Reports prolonged colonic pressure monitoring used to evaluate suspected colon motility disorders, including severe or treatment-resistant constipation.

CMS RVU26DEffective Oct 1, 2026109 payment localities

Medicare pays $121.91 for 91117 nationally in a facility.

Medicare rate · 91117

Colon motility, six-hour study

Office or facility?

Work RVUs
2.39
Total RVUs
3.65
Global days
000

National rate · 2026

$121.91

Facility setting, before claim adjustments.

See every locality for 91117 →Billed by an NP, PA or therapist? →

Medicare allowed amount for participating (non-QP) physicians, before deductible, coinsurance and claim adjustments. Not a patient’s bill or a hospital charge.

Your location

Medicare pays by the payment locality where the service is performed.

On this page 10 sections
  1. Medicare rate
  2. What 91117 covers
  3. By payment locality
  4. Rate map
  5. How it’s calculated
  6. Payment rules
  7. Similar codes
  8. Related codes
  9. Billing questions
  10. Sources

What 91117 covers

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.

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 91117 pays more and less

The same RVUs, adjusted for each area’s costs. Open a locality for its calculation, history and nearby areas.

109 of 109 payment localities

91117 office and facility rates by payment locality
Payment localityOfficeFacility
AlabamaUnavailable$114.79
AlaskaUnavailable$161.47
ArizonaUnavailable$119.93
ArkansasUnavailable$113.91
Atlanta, GAUnavailable$123.94
Austin, TXUnavailable$123.48
Bakersfield, CAUnavailable$124.54
Baltimore area, MDUnavailable$127.25
Beaumont, TXUnavailable$118.24
Brazoria, TXUnavailable$120.90

91117 rates by state

Office rate range in each state. Select a state to see its payment localities.

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Local rates. Clear comparisons.

Hover or focus a tile to see its rate range. Select it to open the state’s fee schedule.

View every state and territory as a table
91117 office rate range by state
State / territoryOffice rate rangeLocalities
AKNo published base rate1
ALNo published base rate1
ARNo published base rate1
AZNo published base rate1
CANo published base rate29
CONo published base rate1
CTNo published base rate1
DCNo published base rate1
DENo published base rate1
FLNo published base rate3
GANo published base rate2
GUNo published base rate1
HINo published base rate1
IANo published base rate1
IDNo published base rate1
ILNo published base rate4
INNo published base rate1
KSNo published base rate1
KYNo published base rate1
LANo published base rate2
MANo published base rate2
MDNo published base rate3
MENo published base rate2
MINo published base rate2
MNNo published base rate1
MONo published base rate3
MSNo published base rate1
MTNo published base rate1
NCNo published base rate1
NDNo published base rate1
NENo published base rate1
NHNo published base rate1
NJNo published base rate2
NMNo published base rate1
NVNo published base rate1
NYNo published base rate5
OHNo published base rate1
OKNo published base rate1
ORNo published base rate2
PANo published base rate2
PRNo published base rate1
RINo published base rate1
SCNo published base rate1
SDNo published base rate1
TNNo published base rate1
TXNo published base rate8
UTNo published base rate1
VANo published base rate2
VINo published base rate1
VTNo published base rate1
WANo published base rate2
WINo published base rate1
WVNo published base rate1
WYNo published base rate1

How the 91117 rate is calculated

Each of 91117’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 · 91117

RVUs × geographic indexes × conversion factor

Office or facility?

Work2.39

2.39 RVUs× 1.000 GPCI

Practice expense1.08

1.08 RVUs× 1.000 GPCI

Malpractice0.18

0.18 RVUs× 1.000 GPCI

Adjusted RVUs

3.6500

Conversion factor

$33.4009

Medicare rate

$121.91

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

Payment rules and modifiers for 91117

The CMS indicators that decide how 91117 is paid alongside other services.

CMS payment indicators · 91117

Colon motility, six-hour study

RuleCMS valueWhat it means
Global period000Same-day global: pre- and post-op care on the day of the procedure is included.
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/technical0Physician service: no professional/technical split.

91117 compared with similar codes

Compare codes · National

4 codes, side by side

Office or facility?

  • 91117

    Colon motility, six-hour study2.39 wRVU

    Not priced

  • 91112

    Motility capsule, transit and pressure measurement2.05 wRVU

    $1,767.24

  • 91124

    Rectal physiology, sensation, tone, compliance3.05 wRVU

    $768.55

  • 91125

    Anorectal testing, manometry with sensory testing2.7 wRVU

    $347.37

How to choose

91112Motility capsuleTransit and pressure measurement
Choose 91117 for prolonged manometric assessment of colonic motor activity; 91112 uses a wireless capsule to measure gastrointestinal transit and pressure.
91124Rectal physiologySensation, tone, compliance
91124 evaluates anorectal sensation, tone, and compliance. It is not the prolonged colonic motility study reported with 91117.
91125Anorectal testingManometry with sensory testing
91125 is anorectal manometry with rectal sensation and balloon expulsion testing; 91117 assesses colonic motility over an extended study.

Codes related to 91117

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

Codes related to 91117
CodeHow it relatesNational office range
Used instead
91112Motility capsule, transit and pressure measurementWireless capsule measurement evaluates gastrointestinal transit and pressure rather than prolonged colonic manometry.$1,526.57–$2,522.60
91124Rectal physiology, sensation, tone, complianceEvaluates anorectal sensation, tone, and compliance when the clinical question concerns rectal function.$672.02–$1,067.78
91125Anorectal testing, manometry with sensory testingEvaluates anorectal manometry with rectal sensation and balloon expulsion testing.$309.15–$465.82

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 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 91117PPRRVU2026_Oct_nonQPP.csv, line 11,633 (RVU26D)

Open CMS sourceHow we calculate rates

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