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CPT code 43756: Duodenal aspiration, single specimen2026 Medicare rate & RVUs in King County, WA

Reports diagnostic passage of a tube into the duodenum to aspirate one specimen of duodenal contents for laboratory evaluation.

CMS RVU26DEffective Oct 1, 2026One payment locality

In King County, WA, Medicare pays $366.73 for 43756 in the office and $52.39 when it’s performed in a hospital or facility.

$366.73Office (non-facility)
$52.39Hospital or facility
+20.9%vs the national office rate ($303.28)

Check a contract rate as a % of Medicare · 43756 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 43756 for the payment locality that covers the ZIP.

On this page 11 sections
  1. Rate in King County, WA
  2. What 43756 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 43756 covers

A clinician passes an intubation tube into the duodenum and aspirates duodenal contents for diagnostic testing. The service may be performed when a specimen of duodenal fluid is needed for laboratory evaluation; it is distinct from collecting gastric contents or placing a tube for therapeutic use. The code is for one specimen, making specimen count a key distinction from its duodenal sibling code.

Report the service when documentation supports diagnostic duodenal intubation and aspiration of a single specimen. The record should identify the duodenal site, the diagnostic purpose, and the specimen obtained. CMS assigns a 0-day global period, so same-day preoperative and postoperative care is included. An assistant at surgery may be paid; co-surgeons and team surgery are not permitted. Modifier 50 is inappropriate for this service.

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 King County, WA compares for 43756

Across 109 of 109 payment localities, the office rate for 43756 runs from $263.25 in Arkansas to $426.89 in San Benito County, CA. King County, WA pays $366.73. The RVUs are the same everywhere; the geographic indexes change the dollars.

43756 in King County, WA vs other payment areas
  1. King County, WA · this page$366.73
  2. Rest of Washington · Washington$317.67−$49.06
  3. Los Angeles, CA · California$354.01−$12.72
  4. Washington, DC area · District of Columbia$354.01−$12.72
  5. Miami, FL · Florida$318.17−$48.56
  6. Chicago, IL · Illinois$307.86−$58.87
  7. Manhattan, NY · New York$350.95−$15.78

Other areas in Washington first, then benchmark localities. Bars start at $0.

Every other payment area

43756 in every other Medicare payment locality
Payment localityOfficeFacility
AlaskaAlaska$332.69$59.85
AlabamaAlabama$267.78$43.62
ArkansasArkansas$263.25$43.18
ArizonaArizona$294.39$46.15
Bakersfield, CACalifornia$329.33$48.55
Chico, CACalifornia$329.11$48.33
El Centro, CACalifornia$329.12$48.34
Fresno, CACalifornia$329.11$48.33

43756 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.

$263.25

$378.00

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

View every state and territory as a table
43756 office rate range by state
State / territoryOffice rate rangeLocalities
AK$332.691
AL$267.781
AR$263.251
AZ$294.391
CA$329.11–$426.8929
CO$320.731
CT$325.521
DC$354.011
DE$299.861
FL$292.32–$318.173
GA$273.93–$308.242
GU$340.091
HI$340.091
IA$278.421
ID$279.981
IL$280.59–$312.714
IN$281.941
KS$275.631
KY$272.461
LA$271.45–$287.322
MA$317.83–$357.572
MD$306.65–$354.013
ME$280.33–$299.932
MI$279.58–$295.232
MN$309.641
MO$265.15–$290.043
MS$264.321
MT$303.281
NC$283.951
ND$301.891
NE$280.581
NH$314.301
NJ$329.89–$349.162
NM$280.851
NV$303.171
NY$288.79–$359.035
OH$279.301
OK$273.241
OR$301.48–$333.712
PA$280.53–$315.492
PR$306.281
RI$312.611
SC$281.961
SD$301.731
TN$277.091
TX$278.28–$319.078
UT$286.491
VA$297.90–$354.012
VI$306.281
VT$299.371
WA$317.67–$366.732
WI$290.071
WV$268.151
WY$302.671

See 43756 in every payment locality

How the 43756 rate is calculated

Each of 43756’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 · 43756

RVUs × geographic indexes × conversion factor

Office or facility?

Work0.75

0.75 RVUs× 1.000 GPCI

Practice expense8.26

8.26 RVUs× 1.000 GPCI

Malpractice0.07

0.07 RVUs× 1.000 GPCI

Adjusted RVUs

9.0800

Conversion factor

$33.4009

Medicare rate

$303.28

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

The exact King County, WA inputs and CMS source lines

PPRRVU2026_Oct_nonQPP.csv

5,287

Code
43756
Physician work
0.75
Practice expense
8.26
Malpractice
0.07

GPCI2026.csv

108

Locality
King County, WA
Physician work
1.050
Practice expense
1.227
Malpractice
0.817
Office calculation for 43756 in King County, WA
ComponentRVULocality factorAdjusted
Physician work0.75× 1.0500.7875
Practice expense8.26× 1.22710.1350
Malpractice0.07× 0.8170.0572
Total RVUs10.9797
Conversion factor× 33.4009

Office rate, King County, WA$366.73

Office: (0.75 × 1.05 + 8.26 × 1.227 + 0.07 × 0.817) × $33.4009 = $366.73

Facility: (0.75 × 1.05 + 0.59 × 1.227 + 0.07 × 0.817) × $33.4009 = $52.39

Open 43756 in the RVU calculator

Payment rules and modifiers for 43756

The CMS indicators that decide how 43756 is paid alongside other services.

CMS payment indicators · 43756

Duodenal aspiration, single specimen

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)2Paid.
Co-surgeons (62)0Not permitted.
Team surgery (66)0Not permitted.
Professional/technical0Physician service: no professional/technical split.

What modifiers do to the payment

Modifier 80 · payment effect

With and without the modifier

43756 without 80 · national office

$303.28

Duodenal aspiration, single specimen

43756-80 · Assistant: 16%

$48.52

A physician assistant at surgery is paid 16% of the surgeon’s fee schedule amount.

When to use modifier 80

Codes related to 43756

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

Codes related to 43756
CodeHow it relatesOffice range, King County, WA
Same family
43757Duodenal aspiration, multiple specimensDiagnostic duodenal aspiration when multiple specimens are obtained.$491.21
Used instead
43754Gastric aspiration, single specimenDiagnostic aspiration of a gastric specimen rather than a duodenal specimen.$412.28
43755Gastric aspiration, multiple diagnostic specimensDiagnostic aspiration of multiple gastric specimens.$268.73
43753Gastric aspiration, therapeutic decompressionTherapeutic gastric intubation with aspiration, rather than diagnostic duodenal sampling.No office rate
43752Gastric tube placement, nasal or oral routeNasal or oral gastric tube placement without this diagnostic duodenal aspiration service.No office rate

How 43756 has changed in King County, WA

43756 · Office / nonfacility

$366.73

Effective 2026-10-01

The base rate is $59.54 higher than on 2025-10-01, moving from $307.19 to $366.73 (19.4%).

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

    $307.19changed to$366.73

    • Conversion factor 32.3465 changed to 33.4009
    • Work RVU 0.77 changed to 0.75
    • Practice expense RVU 7.07 changed to 8.26
    • Malpractice RVU 0.08 changed to 0.07
    • Work GPCI 1.043 changed to 1.050
    • Practice expense GPCI 1.220 changed to 1.227
    • Malpractice GPCI 0.853 changed to 0.817

    Held through RVU26B, RVU26C, RVU26D.

  2. January 1, 2025

    RVU25A

    $329.81changed to$307.19

    • Conversion factor 33.2875 changed to 32.3465
    • Practice expense RVU 7.40 changed to 7.07
    • Malpractice RVU 0.09 changed to 0.08

    Held through RVU25B, RVU25C, RVU25D.

  3. March 9, 2024

    RVU24AR

    $324.43changed to$329.81

    • Conversion factor 32.7442 changed to 33.2875

    Held through RVU24B, RVU24C, RVU24D.

  4. January 1, 2024

    RVU24A

    $337.05changed to$324.43

    • Conversion factor 33.8872 changed to 32.7442
    • Practice expense RVU 7.51 changed to 7.40
    • Malpractice RVU 0.10 changed to 0.09
    • Work GPCI 1.039 changed to 1.043
    • Practice expense GPCI 1.207 changed to 1.220
    • Malpractice GPCI 0.815 changed to 0.853

  5. January 1, 2023

    RVU23A

    $352.73changed to$337.05

    • Conversion factor 34.6062 changed to 33.8872
    • Practice expense RVU 7.81 changed to 7.51
    • Malpractice RVU 0.09 changed to 0.10
    • Work GPCI 1.036 changed to 1.039
    • Practice expense GPCI 1.194 changed to 1.207
    • Malpractice GPCI 0.776 changed to 0.815

    Held through RVU23B, RVU23C, RVU23D.

  6. January 1, 2022

    RVU22A

    $342.74changed to$352.73

    • Conversion factor 34.8931 changed to 34.6062
    • Practice expense RVU 7.50 changed to 7.81

    Held through RVU22B, RVU22C, RVU22D.

  7. January 1, 2021

    RVU21A

    $295.33changed to$342.74

    • Conversion factor 36.0896 changed to 34.8931
    • Practice expense RVU 6.25 changed to 7.50
    • Work GPCI 1.031 changed to 1.036
    • Practice expense GPCI 1.170 changed to 1.194
    • Malpractice GPCI 0.854 changed to 0.776

    Held through RVU21B, RVU21C, RVU21D.

  8. January 1, 2020

    RVU20A

    $265.20changed to$295.33

    • Conversion factor 36.0391 changed to 36.0896
    • Practice expense RVU 5.65 changed to 6.25
    • Malpractice RVU 0.10 changed to 0.09
    • Work GPCI 1.027 changed to 1.031
    • Practice expense GPCI 1.146 changed to 1.170
    • Malpractice GPCI 0.931 changed to 0.854

    Held through RVU20B, RVU20C, RVU20D.

  9. January 1, 2019

    RVU19A

    $239.75changed to$265.20

    • Conversion factor 35.9996 changed to 36.0391
    • Practice expense RVU 5.04 changed to 5.65

    Held through RVU19B, RVU19C, RVU19D.

  10. January 1, 2018

    RVU18AR1

    $232.08changed to$239.75

    • Conversion factor 35.8887 changed to 35.9996
    • Practice expense RVU 4.87 changed to 5.04
    • Work GPCI 1.026 changed to 1.027
    • Practice expense GPCI 1.151 changed to 1.146
    • Malpractice GPCI 0.713 changed to 0.931

    Held through RVU18B, RVU18C, RVU18D.

  11. January 1, 2017

    RVU17A

    $235.56changed to$232.08

    • Conversion factor 35.8043 changed to 35.8887
    • Practice expense RVU 4.97 changed to 4.87
    • Work GPCI 1.025 changed to 1.026
    • Practice expense GPCI 1.155 changed to 1.151
    • Malpractice GPCI 0.495 changed to 0.713

    Held through RVU17B, RVU17C, RVU17D.

  12. January 1, 2016

    RVU16A

    $238.25changed to$235.56

    • Conversion factor 35.9335 changed to 35.8043
    • Practice expense RVU 5.01 changed to 4.97
    • Malpractice RVU 0.11 changed to 0.10

    Held through RVU16B, RVU16C, RVU16D.

  13. July 1, 2015

    RVU15C

    $237.06changed to$238.25

    • Conversion factor 35.7547 changed to 35.9335

    Held through RVU15D.

  14. January 1, 2015

    RVU15A

    $242.08changed to$237.06

    • Conversion factor 35.8228 changed to 35.7547
    • Practice expense RVU 5.16 changed to 5.01
    • Malpractice RVU 0.05 changed to 0.11
    • Practice expense GPCI 1.150 changed to 1.155
    • Malpractice GPCI 0.688 changed to 0.495

    Held through RVU15B.

  15. January 1, 2014

    RVU14A

    $261.11changed to$242.08

    • Conversion factor 34.0230 changed to 35.8228
    • Practice expense RVU 5.98 changed to 5.16
    • Practice expense GPCI 1.144 changed to 1.150
    • Malpractice GPCI 0.881 changed to 0.688

    Held through RVU14B, RVU14C, RVU14D.

  16. January 1, 2013

    RVU13AR

    Earliest loaded release: $261.11

    Held through RVU13B, RVU13C, RVU13D.

Rates in every CMS release
Effective fromOfficeFacilityCMS release
2026-10-01$366.73$52.39RVU26D
2026-07-01$366.73$52.39RVU26C
2026-04-01$366.73$52.39RVU26B
2026-01-01$366.73$52.39RVU26A
2025-10-01$307.19$54.23RVU25D
2025-07-01$307.19$54.23RVU25C
2025-04-01$307.19$54.23RVU25B
2025-01-01$307.19$54.23RVU25A
2024-10-01$329.81$56.09RVU24D
2024-07-01$329.81$56.09RVU24C
2024-04-01$329.81$56.09RVU24B
2024-03-09$329.81$56.09RVU24AR
2024-01-01$324.43$55.18RVU24A
2023-10-01$337.05$56.05RVU23D
2023-07-01$337.05$56.05RVU23C
2023-04-01$337.05$56.05RVU23B
2023-01-01$337.05$56.05RVU23A
2022-10-01$352.73$56.05RVU22D
2022-07-01$352.73$56.05RVU22C
2022-04-01$352.73$56.05RVU22B
2022-01-01$352.73$56.05RVU22A
2021-10-01$342.74$56.10RVU21D
2021-07-01$342.74$56.10RVU21C
2021-04-01$342.74$56.10RVU21B
2021-01-01$342.74$56.10RVU21A
2020-10-01$295.33$56.76RVU20D
2020-07-01$295.33$56.76RVU20C
2020-04-01$295.33$56.76RVU20B
2020-01-01$295.33$56.76RVU20A
2019-10-01$265.20$57.05RVU19D
2019-07-01$265.20$57.05RVU19C
2019-04-01$265.20$57.05RVU19B
2019-01-01$265.20$57.05RVU19A
2018-10-01$239.75$57.40RVU18D
2018-07-01$239.75$57.40RVU18C
2018-04-01$239.75$57.40RVU18B
2018-01-01$239.75$57.40RVU18AR1
2017-10-01$232.08$55.70RVU17D
2017-07-01$232.08$55.70RVU17C
2017-04-01$232.08$55.70RVU17B
2017-01-01$232.08$55.70RVU17A
2016-10-01$235.56$55.26RVU16D
2016-07-01$235.56$55.26RVU16C
2016-04-01$235.56$55.26RVU16B
2016-01-01$235.56$55.26RVU16A
2015-10-01$238.25$56.46RVU15D
2015-07-01$238.25$56.46RVU15C
2015-04-01$237.06$56.18RVU15B
2015-01-01$237.06$56.18RVU15A
2014-10-01$242.08$55.87RVU14D
2014-07-01$242.08$55.87RVU14C
2014-04-01$242.08$55.87RVU14B
2014-01-01$242.08$55.87RVU14A
2013-10-01$261.11$56.76RVU13D
2013-07-01$261.11$56.76RVU13C
2013-04-01$261.11$56.76RVU13B
2013-01-01$261.11$56.76RVU13AR

Price 43756 for an earlier date of service

Where the King County, WA rate applies

King County, WA is a Medicare payment area, not a city. Our Census mapping connects it to 63 cities and communities in Washington. Some span more than one payment area; confirm with the service ZIP.

  • Seattle
  • Algona
  • Ames Lake
  • 43756 in Auburn · multiple payment areas
  • Baring
  • Beaux Arts Village
  • Bellevue
  • Black Diamond

Browse all communities in Washington

43756 billing questions

When should 43756 be chosen over 43757?

Use 43756 for aspiration of one diagnostic duodenal specimen. The related 43757 code is for multiple specimens.

How does this differ from gastric intubation codes?

43756 involves diagnostic intubation and aspiration in the duodenum. Codes 43754 and 43755 concern gastric specimens, with the specimen count distinguishing those codes.

Can tube placement be billed separately?

The intubation and aspiration are part of this diagnostic service. Do not separately report a tube-placement service for the same intubation.

What documentation supports reporting 43756?

Document that the tube reached the duodenum, that aspiration was performed for diagnostic evaluation, and that one specimen was obtained.

Can modifier 50 be used, or can co-surgeons be reported?

Modifier 50 is inappropriate for this service. CMS does not permit co-surgeons or team surgery; an assistant at surgery may be paid.

What care is included in the global period?

The service has a 0-day global period, which includes same-day preoperative and postoperative care.

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 43756PPRRVU2026_Oct_nonQPP.csv, line 5,287 (RVU26D)
Geographic factors for King County, WAGPCI2026.csv, line 108 (RVU26D)

Open CMS sourceHow we calculate rates

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