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CPT 93896: Intracranial Doppler Vasoreactivity Test

CPT code 93896 denotes an add-on vasoreactivity test performed with a complete transcranial Doppler ultrasound of intracranial arteries. The procedure measures cerebrovascular reactivity to changes in carbon dioxide levels to assess vessel tone and cerebral blood flow dynamics. This test is clinically relevant for evaluating patients with suspected cerebrovascular reserve impairment, stroke risk stratification, and monitoring of certain neurovascular conditions. Nationally, accurate coding of this add-on service affects clinical documentation, bundled billing with the primary Doppler study, and utilization tracking for cerebrovascular diagnostic services.

Key payers included in this overview are Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a summary of what CPT code 93896 represents, the typical clinical context and site of service, and which payers are commonly involved in coverage decisions. The publication also outlines benchmark and policy topics readers can expect, including reimbursement structure for add-on Doppler services, billing considerations when reporting the test with the primary transcranial Doppler study, and clinical implications for cerebrovascular assessment. Data not available in the input will be noted where applicable.

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Billing Code Overview

CPT code 93896 is an add-on Doppler ultrasound vasoreactivity test of intracranial arteries performed in conjunction with a complete Doppler ultrasound of the arteries inside the head. The study evaluates how well the intracranial arteries respond to changes in carbon dioxide levels, which can alter vessel tone and cerebral blood flow.

Service Type: Diagnostic vascular ultrasound — intracranial vasoreactivity testing (add-on)

Typical Site of Service: Hospital outpatient department, outpatient vascular laboratory, or other diagnostic imaging facility where transcranial Doppler and physiologic challenge testing are performed.

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CPT 93896: Intracranial Doppler Vasoreactivity Test

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Billing Code Overview

Service Type: Diagnostic vascular ultrasound — intracranial vasoreactivity testing (add-on)

Clinical & Coding Specifications

Clinical Context

A 58-year-old patient with a history of transient ischemic attacks and known intracranial arterial stenosis is referred for a comprehensive intracranial arterial Doppler ultrasound with vasoreactivity testing. The noninvasive study is performed in an outpatient vascular laboratory or hospital radiology/neurology ultrasound suite. The workflow includes: patient consent and screening, baseline transcranial Doppler (TCD) evaluation of intracranial arteries, baseline end-tidal CO2 or blood gas measurement, administration of a CO2 challenge or breath-holding protocol (or inhaled CO2 mixture) to alter cerebrovascular CO2 tension, continuous TCD monitoring during the vasoreactivity maneuvers, documentation of flow velocity changes and mean flow velocity responses, and post-test monitoring. The vasoreactivity test is reported as an add-on using 93896 to the complete intracranial arterial Doppler study when assessing cerebrovascular reserve and autoregulatory capacity in patients being evaluated for stroke risk, symptomatic stenosis, or preoperative assessment for carotid or intracranial interventions.

Coding Specifications

Modifier	Description	When to Use
`26`	Professional component	Use when billing only the physician interpretation/report for the procedure when the technical component is billed separately.
`52`	Reduced services	Use if the vasoreactivity portion was partially performed or abbreviated relative to the full protocol.
`53`	Discontinued procedure	Use if the vasoreactivity test was started but terminated due to patient intolerance or safety concerns.
`59`	Distinct procedural service	Use when the vasoreactivity add-on is performed and needs to be identified as a separate distinct service from other noninvasive vascular procedures when payer edits apply.
`62`	Two surgeons	Use if two surgeons with different specialties are co-managing the procedure in a hybrid operative setting (rare for this noninvasive test).
`78`	Return to OR for related procedure by same physician	Not typically used for `93896`, included only when subsequent related operative care occurs after an invasive procedure.
`80`	Assistant surgeon	Use when an assistant surgeon is involved in a related invasive procedure during the same encounter (uncommon for noninvasive TCD).
`82`	Assistant surgeon (when qualified resident unavailable)	Similar to `80` when a qualified resident is not available.
`TC`	Technical component	Use when billing only the technical component (sonographer and equipment) of the Doppler study while the physician bills the professional component separately.
`QX`	Modifier for services by a physician’s assistant (PA)	Use when a PA performs the service under appropriate state law and payer rules.
`QY`	Service furnished by a certified nurse-midwife (CNM) or other qualified practitioner when allowed by payer	Use if the qualified non-physician practitioner performs the service per payer policy.
`AS`	Physician assistant	Use when the service is performed by a physician assistant and payer requires modifier to identify the provider type.
`59`	Distinct procedural service	Use when needed to bypass bundling edits between the vasoreactivity add-on and other vascular ultrasound procedures.

Taxonomy Code	Specialty	Notes
`207RH0000X`	Radiology - Diagnostic Radiology	Radiologists may interpret intracranial Doppler and vasoreactivity studies.
`2084P0800X`	Neurology	Vascular neurologists frequently order and interpret TCD vasoreactivity testing for cerebrovascular reserve assessment.
`3336C0002X`	Vascular Surgery	Vascular surgeons may use results for preoperative evaluation for carotid or intracranial interventions.
`174400000X`	Cardiology - Noninvasive Cardiology	Noninvasive cardiologists or cerebrovascular lab directors who supervise vascular ultrasound programs may be involved.
`163WK0200X`	Diagnostic Medical Sonography (Adult Vascular Sonographer)	Sonographers perform the technical acquisition of TCD and vasoreactivity testing.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`I63.9`	Cerebral infarction, unspecified	Used for patients with ischemic stroke history undergoing cerebrovascular reserve assessment.
`G45.9`	Transient cerebral ischemic attack, unspecified	TCD vasoreactivity testing helps evaluate stroke risk after TIAs.
`I67.2`	Cerebral atherosclerosis	Intracranial atherosclerotic disease is a common indication to assess vasoreactivity.
`I65.29`	Occlusion and stenosis of unspecified carotid artery	Carotid disease influences intracranial flow and is relevant to testing.
`I69.398`	Other sequelae of cerebral infarction	Post-stroke patients may be evaluated for residual cerebrovascular reserve.
`G93.89`	Other specified disorders of brain (eg, cerebral vasomotor reactivity disorder)	Used when documenting abnormal cerebrovascular reactivity findings.
`I67.89`	Other cerebrovascular diseases	Captures non-atherosclerotic intracranial vascular conditions prompting testing.
`I60.9`	Nontraumatic subarachnoid hemorrhage, unspecified	Vasoreactivity testing may be used in follow-up of certain hemorrhagic vascular conditions.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`93892`	Duplex scan of extracranial arteries; complete bilateral study	Often performed before or alongside intracranial Doppler to assess extracranial carotid and vertebral disease that may influence intracranial hemodynamics.
`93886`	Duplex scan of arterial inflow (eg, abdominal, renal) — complete study	May be performed in patients with systemic vascular disease evaluation; less directly related but part of comprehensive vascular workup when indicated.
`93922`	Continuous wave Doppler arterial studies, extremity arteries, bilateral	Performed when peripheral arterial disease assessment is required in the same vascular laboratory encounter.
`93897`	Transcranial Doppler evaluation of cerebrovascular reserve, administration of cerebral vasodilator (note: if present in some payer fee schedules)	Closely related technique; may represent alternate or complementary coding conventions for vasoreactivity testing depending on payer rules.
`99213`	Office or other outpatient visit for evaluation and management of an established patient, low to moderate complexity	Common E/M code used for pre-test evaluation or post-test follow-up related to the study.

CPT 93880: Duplex Scan of Arteries for Evaluation of Blood Flow

CPT-93882-CAROTID-VERTEBRAL-ARTERY-DUPLEX-UNILATERAL-EVALUATION

CPT 93882: Duplex Ultrasound of Carotid/Vertebral Arteries, Unilateral

CPT-93886-INTRACRANIAL-ARTERIAL-DOPPLER-ULTRASOUND

CPT 93886: Intracranial Arterial Doppler Ultrasound

CPT-93888-TRANSCRANIAL-DOPPLER-INTRACRANIAL-ARTERIAL-FLOW

CPT 93888: Transcranial Doppler Ultrasound of Intracranial Arteries

CPT-93892-TRANSCRANIAL-DOPPLER-ULTRASOUND-NON-CONTRAST-EMBOLI-EVALUATION

CPT 93892: Transcranial Doppler Ultrasound Without Contrast to Detect Emboli

CPT-93893-CONTRAST-ENHANCED-TRANSCRANIAL-DOPPLER-SHUNT-EVALUATION

CPT 93893: Contrast-Enhanced Transcranial Doppler for Shunt Evaluation

CPT-93895-CAROTID-INTIMA-MEDIA-THICKNESS-ULTRASOUND

CPT 93895: Carotid Intima-Media Thickness Ultrasound Measurement

CPT-93897-INTRACRANIAL-EMBOLI-DETECTION-STUDY-ADDON

CPT 93897: Intracranial Emboli Detection Study, Add-On

CPT-93898-INTRACRANIAL-DOPPLER-WITH-MICROBUBBLE-SHUNT-DETECTION

CPT 93898: Intracranial Doppler with Microbubble for Shunt Detection

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.

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Clinical & Coding Specifications

Clinical Context

Coding Specifications

Modifier	Description	When to Use
`26`	Professional component	Use when billing only the physician interpretation/report for the procedure when the technical component is billed separately.
`52`	Reduced services	Use if the vasoreactivity portion was partially performed or abbreviated relative to the full protocol.
`53`	Discontinued procedure	Use if the vasoreactivity test was started but terminated due to patient intolerance or safety concerns.
`59`	Distinct procedural service	Use when the vasoreactivity add-on is performed and needs to be identified as a separate distinct service from other noninvasive vascular procedures when payer edits apply.
`62`	Two surgeons	Use if two surgeons with different specialties are co-managing the procedure in a hybrid operative setting (rare for this noninvasive test).
`78`	Return to OR for related procedure by same physician	Not typically used for `93896`, included only when subsequent related operative care occurs after an invasive procedure.
`80`	Assistant surgeon	Use when an assistant surgeon is involved in a related invasive procedure during the same encounter (uncommon for noninvasive TCD).
`82`	Assistant surgeon (when qualified resident unavailable)	Similar to `80` when a qualified resident is not available.
`TC`	Technical component	Use when billing only the technical component (sonographer and equipment) of the Doppler study while the physician bills the professional component separately.
`QX`	Modifier for services by a physician’s assistant (PA)	Use when a PA performs the service under appropriate state law and payer rules.
`QY`	Service furnished by a certified nurse-midwife (CNM) or other qualified practitioner when allowed by payer	Use if the qualified non-physician practitioner performs the service per payer policy.
`AS`	Physician assistant	Use when the service is performed by a physician assistant and payer requires modifier to identify the provider type.
`59`	Distinct procedural service	Use when needed to bypass bundling edits between the vasoreactivity add-on and other vascular ultrasound procedures.

Taxonomy Code	Specialty	Notes
`207RH0000X`	Radiology - Diagnostic Radiology	Radiologists may interpret intracranial Doppler and vasoreactivity studies.
`2084P0800X`	Neurology	Vascular neurologists frequently order and interpret TCD vasoreactivity testing for cerebrovascular reserve assessment.
`3336C0002X`	Vascular Surgery	Vascular surgeons may use results for preoperative evaluation for carotid or intracranial interventions.
`174400000X`	Cardiology - Noninvasive Cardiology	Noninvasive cardiologists or cerebrovascular lab directors who supervise vascular ultrasound programs may be involved.
`163WK0200X`	Diagnostic Medical Sonography (Adult Vascular Sonographer)	Sonographers perform the technical acquisition of TCD and vasoreactivity testing.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`I63.9`	Cerebral infarction, unspecified	Used for patients with ischemic stroke history undergoing cerebrovascular reserve assessment.
`G45.9`	Transient cerebral ischemic attack, unspecified	TCD vasoreactivity testing helps evaluate stroke risk after TIAs.
`I67.2`	Cerebral atherosclerosis	Intracranial atherosclerotic disease is a common indication to assess vasoreactivity.
`I65.29`	Occlusion and stenosis of unspecified carotid artery	Carotid disease influences intracranial flow and is relevant to testing.
`I69.398`	Other sequelae of cerebral infarction	Post-stroke patients may be evaluated for residual cerebrovascular reserve.
`G93.89`	Other specified disorders of brain (eg, cerebral vasomotor reactivity disorder)	Used when documenting abnormal cerebrovascular reactivity findings.
`I67.89`	Other cerebrovascular diseases	Captures non-atherosclerotic intracranial vascular conditions prompting testing.
`I60.9`	Nontraumatic subarachnoid hemorrhage, unspecified	Vasoreactivity testing may be used in follow-up of certain hemorrhagic vascular conditions.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`93892`	Duplex scan of extracranial arteries; complete bilateral study	Often performed before or alongside intracranial Doppler to assess extracranial carotid and vertebral disease that may influence intracranial hemodynamics.
`93886`	Duplex scan of arterial inflow (eg, abdominal, renal) — complete study	May be performed in patients with systemic vascular disease evaluation; less directly related but part of comprehensive vascular workup when indicated.
`93922`	Continuous wave Doppler arterial studies, extremity arteries, bilateral	Performed when peripheral arterial disease assessment is required in the same vascular laboratory encounter.
`93897`	Transcranial Doppler evaluation of cerebrovascular reserve, administration of cerebral vasodilator (note: if present in some payer fee schedules)	Closely related technique; may represent alternate or complementary coding conventions for vasoreactivity testing depending on payer rules.
`99213`	Office or other outpatient visit for evaluation and management of an established patient, low to moderate complexity	Common E/M code used for pre-test evaluation or post-test follow-up related to the study.

CPT 93880: Duplex Scan of Arteries for Evaluation of Blood Flow

CPT-93882-CAROTID-VERTEBRAL-ARTERY-DUPLEX-UNILATERAL-EVALUATION

CPT 93882: Duplex Ultrasound of Carotid/Vertebral Arteries, Unilateral

CPT-93886-INTRACRANIAL-ARTERIAL-DOPPLER-ULTRASOUND

CPT 93886: Intracranial Arterial Doppler Ultrasound

CPT-93888-TRANSCRANIAL-DOPPLER-INTRACRANIAL-ARTERIAL-FLOW

CPT 93888: Transcranial Doppler Ultrasound of Intracranial Arteries

CPT-93892-TRANSCRANIAL-DOPPLER-ULTRASOUND-NON-CONTRAST-EMBOLI-EVALUATION

CPT 93892: Transcranial Doppler Ultrasound Without Contrast to Detect Emboli

CPT-93893-CONTRAST-ENHANCED-TRANSCRANIAL-DOPPLER-SHUNT-EVALUATION

CPT 93893: Contrast-Enhanced Transcranial Doppler for Shunt Evaluation

CPT-93895-CAROTID-INTIMA-MEDIA-THICKNESS-ULTRASOUND

CPT 93895: Carotid Intima-Media Thickness Ultrasound Measurement

CPT-93897-INTRACRANIAL-EMBOLI-DETECTION-STUDY-ADDON

CPT 93897: Intracranial Emboli Detection Study, Add-On

CPT-93898-INTRACRANIAL-DOPPLER-WITH-MICROBUBBLE-SHUNT-DETECTION

CPT 93898: Intracranial Doppler with Microbubble for Shunt Detection

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.

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CPT 93896: Intracranial Doppler Vasoreactivity Test

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Billing Code Overview

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CPT 93896: Intracranial Doppler Vasoreactivity Test

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Billing Code Overview

Clinical & Coding Specifications

Clinical Context

Coding Specifications

Related Diagnoses

Related CPT Codes

Related Codes

References

Clinical & Coding Specifications

Clinical Context

Coding Specifications

Related Diagnoses

Related CPT Codes

Related Codes

References