CPT 70555Radiology

Fmri brain by phys/psych

CPT code 70555 represents functional magnetic resonance imaging (fMRI) of the brain performed with the patient actively responding to physical or psychological stimuli during the scan. This advanced imaging technique measures brain activity by detecting changes in blood flow while the patient performs specific tasks.

Showing rates for

National Average

Base Medicare rate

$114.18

This calculator gives a typical-case estimate using standard Medicare modifier rules. Actual payment depends on payer policies, documentation, code-specific CMS status indicators, and locality. Verify before billing.

RVU breakdown

Work RVU

2.54

PE RVU (NF)

0.86

MP RVU

0.13

Total RVU

3.53

Conversion factor: 32.3465 · Source: CMS MPFS RVU25A · Confidence: High

NCCI bundling edits

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Billing tips

Document the specific physiological or psychological paradigm administered during the fMRI acquisition in the operative note, including task types, duration, and patient compliance
Impact: Missing paradigm documentation is the leading cause of downcoding to standard MRI codes, resulting in underpayment of approximately $50-75 per study
Verify that the radiology report explicitly states 'functional MRI' and describes the activation tasks performed, not just anatomical findings
Impact: Generic MRI reports trigger automatic denials; specific fMRI terminology and methodology description prevents 15-25% denial rate
Bill facility and non-facility rates correctly based on place of service; both reimburse at $114.18 for 70555 under 2025 Medicare rates
Impact: While rates are identical for this code, incorrect POS coding can trigger audit flags and payment delays
When performed with anatomical brain MRI sequences on same date, append modifier 59 to 70555 and provide separate documentation justifying medical necessity of functional component
Impact: Prevents bundling denials that would result in loss of the full $114.18 functional study payment
Ensure pre-authorization is obtained for non-Medicare payers, as fMRI often requires prior approval even when standard MRI does not
Impact: Commercial payers deny 30-40% of fMRI claims without pre-auth, requiring costly appeals and payment delays of 60+ days
Code presurgical planning separately from diagnostic workup when applicable; link diagnosis codes that clearly support functional mapping necessity
Proper ICD-10 linkage (such as D43.x for brain neoplasm with impending surgery) improves first-pass payment rate by 20-25%

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Frequently asked questions

What is the difference between CPT 70555 and a standard brain MRI code?

CPT 70555 requires the patient to actively perform physiological tasks (like moving fingers) or psychological tasks (like word association) during the scan to map brain function. Standard brain MRI codes (70551-70553) are purely anatomical images taken while the patient lies still, without functional testing.

How much does Medicare pay for CPT 70555 in 2025?

Medicare pays $114.18 for CPT 70555 in 2025 based on the national average rate. This applies to both facility and non-facility settings. The code has a total RVU of 3.53 (2.54 work RVU, 0.86 PE RVU, 0.13 MP RVU) multiplied by the 2025 conversion factor of 32.3465.

Can you bill CPT 70555 with a regular brain MRI on the same date of service?

Yes, but you must append modifier 59 to CPT 70555 and provide clear documentation that the functional MRI was a distinct procedure with separate clinical necessity beyond the anatomical imaging. The two studies must have different acquisition sequences and address different clinical questions.

What diagnosis codes support medical necessity for CPT 70555?

Common supporting diagnoses include brain neoplasms requiring presurgical mapping (C71.x, D43.x), intractable epilepsy (G40.x with intractability), pre-operative evaluation for lesion resection (D49.6), cerebrovascular disorders affecting eloquent cortex (I67.x), and certain movement disorders or language disturbances requiring functional localization.

Do I need prior authorization for CPT 70555?

Medicare typically does not require prior authorization for 70555, but most commercial payers do require pre-authorization because fMRI is considered advanced imaging. Always verify with the specific payer before scheduling, as denial rates exceed 30% without proper pre-authorization for non-Medicare patients.

What documentation proves that physiological or psychological testing was actually performed during the fMRI?

Required documentation includes the specific paradigm protocol (motor task, language task, etc.), technologist notes confirming patient performed the tasks, timing/duration of stimulus presentation, patient compliance notation, and radiologist interpretation describing activation patterns observed. Screen captures of activation maps strengthen documentation.

Can a neurologist or neurosurgeon bill CPT 70555 for interpretation?

Only physicians with appropriate credentials in MR imaging interpretation (typically radiologists or neuroradiologists) can bill for the professional component of 70555. Neurosurgeons and neurologists may order the study and use results for surgical planning, but cannot bill the interpretation unless they hold radiology board certification and meet facility privileging requirements.