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HCPCS code A9541: Sulfur colloid, per study dose2026 Medicare rate & RVUs

Technetium-99m sulfur colloid is a diagnostic radiopharmaceutical reported per study dose for selected liver-spleen, gastric-emptying, and lymphatic imaging.

CMS RVU26DEffective Oct 1, 2026109 payment localities6.9K Medicare services in 2024

Medicare rate · A9541

Sulfur colloid, per study dose

Office or facility?

Work RVUs
0
Total RVUs
0.00
Global days
XXX

National rate · 2026

—

Not priced in the facility setting.

See every locality for A9541 →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 A9541 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 A9541 covers

Technetium-99m sulfur colloid is a diagnostic radiopharmaceutical used in nuclear medicine. Depending on the study, it may be administered intravenously for liver-spleen imaging, orally for gastric-emptying evaluation, or by local injection for lymphatic mapping. Nuclear medicine departments and other entities billing the radiopharmaceutical report this code alongside the applicable imaging service when the dose is supplied for the study.

The physician fee schedule status is C: CMS publishes no national payment, and the Medicare Administrative Contractor sets payment for each claim under other contractor pricing. Coverage is left to the contractor’s judgment. One code represents a study dose of up to 20 millicuries; it is not a per-millicurie unit. The dose and administration route depend on the examination being performed.

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 A9541 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

A9541 office and facility rates by payment locality
Payment localityOfficeFacility
AlabamaUnavailableUnavailable
AlaskaUnavailableUnavailable
ArizonaUnavailableUnavailable
ArkansasUnavailableUnavailable
Atlanta, GAUnavailableUnavailable
Austin, TXUnavailableUnavailable
Bakersfield, CAUnavailableUnavailable
Baltimore area, MDUnavailableUnavailable
Beaumont, TXUnavailableUnavailable
Brazoria, TXUnavailableUnavailable

A9541 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.

View every state and territory as a table
A9541 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 A9541 rate is calculated

Each of A9541’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 · A9541

RVUs × geographic indexes × conversion factor

Office or facility?

Work0.00

0.00 RVUs× 1.000 GPCI

Practice expense0.00

0.00 RVUs× 1.000 GPCI

Malpractice0.00

0.00 RVUs× 1.000 GPCI

Adjusted RVUs

0.0000

Conversion factor

$33.4009

Medicare rate

$0.00

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

Payment rules and modifiers for A9541

A9541 has no global surgery period, no multiple-procedure, bilateral or assistant-at-surgery adjustment, and no professional/technical split. What changes the payment is where the service happens: the place of service on the claim decides whether Medicare pays the office or the facility rate.

Place of service · A9541

Which rate does Medicare pay?

The POS code on the claim line (CMS-1500 box 24B).

POS 11 · non-facility rate · national

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A9541 isn’t priced in this setting.

A9541 compared with similar codes

Compare codes · National

4 codes, side by side

Office or facility?

  • A9541

    Sulfur colloid, per study dose0 wRVU

    Not priced

  • A9540

    Tc-99m MAA, per study dose0 wRVU

    Not priced

  • A9537

    Mebrofenin, per study dose, up to 15 mCi0 wRVU

    Not priced

  • A9552

    FDG, per study dose0 wRVU

    Not priced

How to choose

A9540Tc-99m MAAPer study dose
A9540 identifies technetium-99m macroaggregated albumin, commonly used for lung perfusion imaging. A9541 identifies sulfur colloid used in different nuclear medicine studies.
A9537MebrofeninPer study dose, up to 15 mCi
A9537 is technetium-99m mebrofenin, used for hepatobiliary imaging. A9541 is sulfur colloid, used for studies such as liver-spleen imaging, gastric emptying, or lymphatic imaging.
A9552FDGPer study dose
A9552 identifies fluorine-18 FDG, a different radiopharmaceutical used in PET imaging. A9541 identifies technetium-99m sulfur colloid for other diagnostic studies.

Codes related to A9541

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

Codes related to A9541
CodeHow it relatesNational office range
Often billed with
78215Liver-spleen scan, static images onlyLiver imaging service commonly performed with sulfur colloid.$154.67–$249.76
78264Gastric emptying, stomach onlyGastric-emptying study that may use orally administered sulfur colloid.$251.63–$406.80
78195Lymphatic imaging, lymphoscintigraphyLymphatic imaging service that may use sulfur colloid.$271.94–$433.07

A9541 billing questions

Is A9541 billed per millicurie?

No. It represents a diagnostic study dose of up to 20 millicuries, rather than a unit for each millicurie.

Which imaging studies commonly use sulfur colloid?

Common uses include liver-spleen imaging, gastric-emptying studies, and lymphatic imaging or mapping. The study determines the administration route.

How does A9541 differ from A9540?

A9541 is technetium-99m sulfur colloid for studies such as liver-spleen, gastric-emptying, or lymphatic imaging. A9540 is technetium-99m macroaggregated albumin, commonly used for lung perfusion imaging.

How does Medicare price A9541?

Its physician fee schedule status is C, so CMS publishes no national payment. The Medicare Administrative Contractor sets claim payment under other contractor pricing, and coverage is left to that contractor’s judgment.

Should the administration route determine code selection?

A9541 identifies the sulfur colloid study dose, not a particular route. Select the radiopharmaceutical code for the agent supplied.

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

Open CMS sourceHow we calculate rates

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