FeeBase
Log inGet started
Menu

CPT code 70558: Functional brain MRI, with contrast2026 Medicare rate & RVUs

Functional MRI of the brain with contrast supports assessment of brain activity and anatomy, including functional mapping during neurologic or presurgical evaluation.

CMS RVU26DEffective Oct 1, 2026109 payment localities72 Medicare services in 2024

Medicare rate · 70558

Functional brain MRI, with contrast

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 70558 →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 70558 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 70558 covers

This service is functional magnetic resonance imaging of the brain performed with contrast material. Functional MRI assesses signal changes associated with brain activity, often while the patient performs tasks that engage functions such as language or movement. Imaging may be part of an evaluation for a brain lesion or before neurosurgery, when clinicians need functional information alongside anatomic imaging. The imaging facility performs the scan, and a qualified physician interprets and reports the findings.

Medicare assigns this code carrier-priced status (C): CMS publishes no national payment, and the Medicare Administrative Contractor sets payment for each claim. The service has a professional component for interpretation and a technical component for equipment and staff. Report modifier 26 for the professional component or TC for the technical component; report the global service without either modifier. This code represents the functional brain MRI performed with contrast, not a contrast agent dose.

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 70558 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

70558 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

70558 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
70558 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 70558 rate is calculated

Each of 70558’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 · 70558

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 70558

The CMS indicators that decide how 70558 is paid alongside other services.

CMS payment indicators · 70558

Functional brain MRI, with contrast

RuleCMS valueWhat it means
Global periodXXXThe global surgery concept doesn’t apply.
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/technical1Diagnostic test with separate professional (26) and technical (TC) components.

What modifiers do to the payment

Modifier 26 · payment effect

With and without the modifier

70558 without 26 · national facility

$0.00

Functional brain MRI, with contrast

70558-26 · Professional component

$169.68

Pays only the interpretation and report.

When to use modifier 26

70558 compared with similar codes

Compare codes · National

5 codes, side by side

Office or facility?

  • 70558

    Functional brain MRI, with contrast0 wRVU

    Not priced

  • 70557

    Brain MRI, without contrast0 wRVU

    Not priced

  • 70559

    Functional brain MRI, without and with contrast0 wRVU

    Not priced

  • 70555

    Functional brain MRI, physician or psychologist0 wRVU

    Not priced

  • 70552

    MRI brain, with contrast1.74 wRVU

    $268.88

How to choose

70557Brain MRIWithout contrast
Use 70557 for functional brain MRI without contrast; use 70558 when the functional MRI is performed with contrast.
70559Functional brain MRIWithout and with contrast
70559 covers functional brain MRI performed both without and with contrast, rather than the with-contrast service alone.
70555Functional brain MRIPhysician or psychologist
70555 describes functional MRI involving physician or psychologist administration of tests and interpretation; 70558 identifies the with-contrast functional imaging service.
70552MRI brainWith contrast
70552 is a conventional brain MRI with contrast, not a functional brain MRI service.

Codes related to 70558

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

Codes related to 70558
CodeHow it relatesNational office range
Same family
70557Brain MRI, without contrastFunctional brain MRI sibling performed without contrast.No office rate
70559Functional brain MRI, without and with contrastFunctional brain MRI sibling performed both without and with contrast.No office rate
Used instead
70554Functional brain MRI, technologist acquisitionRelated functional brain MRI service distinguished by technician administration.$332.25–$516.75
70555Functional brain MRI, physician or psychologistRelated functional brain MRI service involving physician or psychologist administration of tests.No office rate

70558 billing questions

How does this differ from 70557?

70558 is for functional brain MRI performed with contrast. 70557 is the corresponding functional brain MRI code without contrast.

When should 70559 be used instead?

Use 70559 when the functional brain MRI includes imaging both without contrast and then with contrast. 70558 describes the with-contrast service.

Which modifier identifies the interpretation?

Append modifier 26 when billing only the professional interpretation and report. Modifier TC identifies the technical service; the global service is reported without either modifier.

Does Medicare publish a national payment for 70558?

No. The code has carrier-priced status C, so the Medicare Administrative Contractor sets payment for each claim.

How is 70558 different from 70555?

70558 identifies functional brain MRI performed with contrast. 70555 describes a functional MRI service involving physician or psychologist administration of tests with interpretation and reporting.

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

Did this answer your question about what 70558 pays?

Tell us what you were actually trying to work out. We’ll answer you directly, or build the page that does.

Fee sheets · Coming soon

Put 70558 and the rest of your codes on one sheet

Your codes at your locality, with payer contracts beside Medicare.

Join the waitlist