Billing code 91013: Esophageal motilityMedicare rate & RVUs in Missouri
An add-on to esophageal manometry for provocation with stimulation or perfusion when assessing esophageal motor responses.
Medicare pays $25.34–$27.33 for 91013 in the office in Missouri, from Rest Of Missouri to Metropolitan St. Louis. 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.
On this page 9 sections
What 91013 covers
This service adds a provocative phase to esophageal manometry, using stimulation or perfusion to assess how the esophagus responds during pressure testing. A gastroenterologist or other qualified clinician typically performs it in a diagnostic endoscopy or motility lab for patients being evaluated for symptoms such as dysphagia or suspected esophageal motility disorders. The stimulation or perfusion is performed as part of the manometric evaluation, rather than as a separate general reflux-monitoring study.
Report 91013 only with the primary esophageal motility study, 91010; it is not a stand-alone service. The record should support the manometry and the additional provocative procedure performed. CMS treats 91013 as an add-on paid within the primary procedure’s global period. The diagnostic service may be billed globally without a modifier, or by component: modifier 26 identifies the professional interpretation and modifier TC identifies the technical service, including equipment and staff.
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 91013 pays more and less in Missouri
The same RVUs, adjusted for each area’s costs. Open a locality for its calculation, history and nearby areas.
3 payment localities
$25.34 to $27.33
| Payment locality | Office | Facility |
|---|---|---|
| Metropolitan Kansas City | $27.04 | Unavailable |
| Metropolitan St. Louis | $27.33 | Unavailable |
| Rest Of Missouri | $25.34 | Unavailable |
How the 91013 rate is calculated
Each of 91013’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 · 91013
RVUs × geographic indexes × conversion factor
Work0.18
0.18 RVUs× 1.000 GPCI
Practice expense0.66
0.66 RVUs× 1.000 GPCI
Malpractice0.01
0.01 RVUs× 1.000 GPCI
Adjusted RVUs
0.8500
Conversion factor
$33.4009
Medicare rate
$28.39
Every GPCI starts at 1.000, the national rate. Enter a ZIP or drag a slider.
Payment rules and modifiers for 91013
The CMS indicators that decide how 91013 is paid alongside other services.
CMS payment indicators · 91013
Esophageal motility
| 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
91013 without 26 · national office
$28.39
Esophageal motility
91013-26 · Professional component
$9.69
Pays only the interpretation and report.
91013 compared with similar codes
Compare codes · National
4 codes, side by side
How to choose
- 91010Esophageal manometry
- 91010 reports the esophageal motility study itself. Report 91013 in addition only when stimulation or perfusion is performed as part of that study.
- 91030Acid challenge
- 91030 represents acid perfusion testing as a separate esophageal test. 91013 is an add-on when stimulation or perfusion is used during esophageal motility testing.
- 91035Reflux testing
- 91035 is an esophageal reflux-monitoring test using an electrode. 91013 describes a provocative maneuver added to manometry, not reflux monitoring.
91013 billing questions
Can 91013 be reported by itself?
No. It is an add-on to the primary esophageal motility study, 91010, and must be billed with that service.
When is 91013 different from 91010?
Use 91010 for esophageal manometry. Add 91013 when stimulation or perfusion is also performed as a provocative part of that motility evaluation.
How are the professional and technical services reported?
Report the global service without a component modifier, or use modifier 26 for the professional interpretation and modifier TC for the technical service.
Does 91013 have a separate global period?
CMS identifies it as an add-on paid within the primary procedure’s global period. It is reported with 91010.
What documentation supports the add-on?
Document the esophageal manometry and the stimulation or perfusion performed to assess the esophageal motor response.
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
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