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CPT 95924: Combined Autonomic Function Testing, Parasympathetic and Sympathetic

CPT code 95924 represents a combined autonomic function test that evaluates both parasympathetic and sympathetic components of the autonomic nervous system. This diagnostic procedure is used to identify and characterize autonomic disorders that affect blood pressure, heart rate, sweating, and other involuntary functions. Nationally, autonomic testing is an important tool in neurology and cardiology practices for diagnosing conditions such as autonomic neuropathy, dysautonomia, and orthostatic intolerance.

Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of clinical context and the typical sites of service for this procedure, as well as what to expect from payer coverage and coding practice. The publication provides benchmarks and policy-relevant details where available, explains common billing and service-line considerations, and summarizes clinical indications and utility for patient management.

This summary is intended for a national audience of clinicians, coding professionals, and policy analysts who need a clear, practical reference for CPT code 95924 and its role in diagnosing autonomic disorders. Data not available in the input is noted where applicable.

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Billing Code Overview

CPT code 95924 describes a combined autonomic function test that evaluates both parasympathetic and sympathetic components of the autonomic nervous system. The procedure assesses autonomic control of heart rate, blood pressure, sweating, and other involuntary functions to determine the presence, nature, and severity of autonomic disorders.

Service Type: Autonomic nervous system function testing; combined parasympathetic and sympathetic testing

Typical Site of Service: Hospital outpatient department, specialized autonomic laboratory, or ambulatory neurology clinic

Data not available in the input.

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CPT 95924: Combined Autonomic Function Testing, Parasympathetic and Sympathetic

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Billing Code Overview

Service Type: Autonomic nervous system function testing; combined parasympathetic and sympathetic testing

Typical Site of Service: Hospital outpatient department, specialized autonomic laboratory, or ambulatory neurology clinic

Data not available in the input.

Clinical & Coding Specifications

Clinical Context

A 48-year-old patient presents to a neurology clinic with several months of recurrent syncope, orthostatic lightheadedness, and episodes of unexplained tachycardia and sweating. The neurologist suspects a disorder of the autonomic nervous system (for example, autonomic neuropathy, postural orthostatic tachycardia syndrome, or dysautonomia) and schedules comprehensive autonomic testing. The clinical workflow includes a pre-test clinical evaluation and medication reconciliation to discontinue agents that alter autonomic function, informed consent, baseline vital signs, and review of recent cardiac testing. On the test day the patient undergoes combined parasympathetic and sympathetic autonomic function testing in a specialized lab or hospital outpatient department. Monitoring equipment continuously records blood pressure, heart rate, and sweating responses while the clinician performs standardized maneuvers (deep breathing, Valsalva maneuver, tilt-table testing as indicated) to evaluate autonomic reflexes. The provider interprets the results, documents objective findings correlating with symptoms, and generates a detailed report for the referring clinician. Typical sites of service are an outpatient neurology clinic with autonomic lab capabilities, hospital outpatient department, or specialized autonomic testing center.

Coding Specifications

Modifier	Description	When to Use
`11`	Chief or primary procedure	When this autonomic testing is the primary service during the encounter
`22`	Increased procedural services	For unusually extensive testing or prolonged interpretation beyond typical scope
`23`	Unusual anesthesia	If additional anesthesia or sedation was required due to patient anxiety or intolerance
`26`	Professional component	When billing only the physician interpretation/reading of the test separate from technical components
`52`	Reduced services	If testing was started but not completed and a reduced service was provided
`53`	Discontinued procedure	If testing was terminated for patient safety or intolerance prior to completion
`59`	Distinct procedural service	When performed the same day as other distinct procedures/tests and needs separation from unrelated services
`62`	Two surgeons	Rarely applicable; when two qualified professionals jointly perform the procedure (uncommon for this test)
`78`	Return to operating/procedure room for a related procedure during the postoperative period	If patient requires an immediate repeat or continuation of testing in the same episode of care
`80`	Assistant surgeon	Rarely applicable; if an assistant is needed during an associated invasive procedure
`AS`	Physician assistant, nurse practitioner, or clinical nurse specialist service as primary surgeon	If a qualified non-physician practitioner is the primary provider for the test in allowed jurisdictions
`QX`	Qualified non-physician practitioner	When a physician assistant performs the test under Medicare rules requiring modifier for incident-to or split/shared situations (as applicable)
`TC`	Technical component	When billing only for equipment, supplies, and technician time and not the physician interpretation
`QY`	Service furnished under a rural health clinic or federally qualified health center (billing context)	When the test is performed in these specific facility settings

Taxonomy Code	Specialty	Notes
207RH0000X	Neurology	Neurologists commonly order and interpret autonomic testing
2084P0800X	Clinical Neurophysiology	Specialists performing autonomic physiology testing and interpretation
207RG0300X	Pediatric Neurology	For pediatric patients with autonomic disorders (when applicable)
37119C0001X	Electrodiagnostic Medicine	Providers specializing in neurodiagnostic testing and autonomic labs
363LF0000X	Internal Medicine	General internists or cardiologists may coordinate testing for systemic causes

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`G90.9`	Disorder of the autonomic nervous system, unspecified	General diagnosis indicating autonomic dysfunction prompting comprehensive autonomic testing
`G90.8`	Other disorders of the autonomic nervous system	Includes specified autonomic disorders requiring detailed parasympathetic and sympathetic testing
`G90.3`	Multi-system degeneration of the autonomic nervous system	Evaluated with comprehensive autonomic testing to assess severity and distribution
`G90.1`	Familial dysautonomia	Genetic autonomic disorder for which detailed autonomic testing documents physiologic deficits
`I95.1`	Orthostatic hypotension	Common presenting problem investigated with autonomic testing, often including tilt-table assessment
`R55`	Syncope and collapse	Recurrent syncope necessitates autonomic evaluation to identify reflex or autonomic causes
`G31.84`	Mild cognitive impairment, so stated (included when autonomic testing is done for neurodegenerative syndromes)	Autonomic testing is often part of evaluation when autonomic failure is suspected with neurodegenerative disease
`G20`	Parkinson disease	Parkinsonian syndromes frequently have autonomic involvement assessed with `95924`

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`95924`	Autonomic testing; combined parasympathetic and sympathetic function testing	Primary code describing joint testing of autonomic functions to evaluate dysautonomia
`95921`	Autonomic function testing; heart rate response to deep breathing and Valsalva and quantitative sudomotor axon reflex test (QSART) — physiologic components vary by code	Other autonomic testing components that may be performed in the same session or as separate elements depending on lab protocol
`95922`	Autonomic function testing; quantitative sudomotor axon reflex testing (QSART)	Focused sudomotor assessment commonly paired with combined testing to localize autonomic dysfunction
`95925`	Autonomic testing; beat-to-beat blood pressure and heart rate during tilt-table testing	Tilt-table testing is frequently performed alongside combined parasympathetic and sympathetic testing to provoke orthostatic symptoms
`96020`	Autonomic laboratory interpretation and report (example representing interpretation codes)	Professional interpretation and formal reporting are billed separately when allowed; complements the technical component of `95924`

CPT 95919: Quantitative Pupillary Light Reflex Measurement

CPT-95921-AUTONOMIC-FUNCTION-TESTING-ECG-RHYTHM-STRIP

CPT 95921: Autonomic Nervous System Function Testing

CPT-95922-AUTONOMIC-FUNCTION-SYMPATHETIC-TESTING

CPT 95922: Sympathetic Autonomic Function Testing

CPT-95923-SUDOMOTOR-FUNCTION-TEST-SWEAT-GLAND-INNERVATION

CPT 95923: Sudomotor Function Test for Sweat Gland Innervation

Frequently Asked Questions

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
`11`	Chief or primary procedure	When this autonomic testing is the primary service during the encounter
`22`	Increased procedural services	For unusually extensive testing or prolonged interpretation beyond typical scope
`23`	Unusual anesthesia	If additional anesthesia or sedation was required due to patient anxiety or intolerance
`26`	Professional component	When billing only the physician interpretation/reading of the test separate from technical components
`52`	Reduced services	If testing was started but not completed and a reduced service was provided
`53`	Discontinued procedure	If testing was terminated for patient safety or intolerance prior to completion
`59`	Distinct procedural service	When performed the same day as other distinct procedures/tests and needs separation from unrelated services
`62`	Two surgeons	Rarely applicable; when two qualified professionals jointly perform the procedure (uncommon for this test)
`78`	Return to operating/procedure room for a related procedure during the postoperative period	If patient requires an immediate repeat or continuation of testing in the same episode of care
`80`	Assistant surgeon	Rarely applicable; if an assistant is needed during an associated invasive procedure
`AS`	Physician assistant, nurse practitioner, or clinical nurse specialist service as primary surgeon	If a qualified non-physician practitioner is the primary provider for the test in allowed jurisdictions
`QX`	Qualified non-physician practitioner	When a physician assistant performs the test under Medicare rules requiring modifier for incident-to or split/shared situations (as applicable)
`TC`	Technical component	When billing only for equipment, supplies, and technician time and not the physician interpretation
`QY`	Service furnished under a rural health clinic or federally qualified health center (billing context)	When the test is performed in these specific facility settings

Taxonomy Code	Specialty	Notes
207RH0000X	Neurology	Neurologists commonly order and interpret autonomic testing
2084P0800X	Clinical Neurophysiology	Specialists performing autonomic physiology testing and interpretation
207RG0300X	Pediatric Neurology	For pediatric patients with autonomic disorders (when applicable)
37119C0001X	Electrodiagnostic Medicine	Providers specializing in neurodiagnostic testing and autonomic labs
363LF0000X	Internal Medicine	General internists or cardiologists may coordinate testing for systemic causes

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`G90.9`	Disorder of the autonomic nervous system, unspecified	General diagnosis indicating autonomic dysfunction prompting comprehensive autonomic testing
`G90.8`	Other disorders of the autonomic nervous system	Includes specified autonomic disorders requiring detailed parasympathetic and sympathetic testing
`G90.3`	Multi-system degeneration of the autonomic nervous system	Evaluated with comprehensive autonomic testing to assess severity and distribution
`G90.1`	Familial dysautonomia	Genetic autonomic disorder for which detailed autonomic testing documents physiologic deficits
`I95.1`	Orthostatic hypotension	Common presenting problem investigated with autonomic testing, often including tilt-table assessment
`R55`	Syncope and collapse	Recurrent syncope necessitates autonomic evaluation to identify reflex or autonomic causes
`G31.84`	Mild cognitive impairment, so stated (included when autonomic testing is done for neurodegenerative syndromes)	Autonomic testing is often part of evaluation when autonomic failure is suspected with neurodegenerative disease
`G20`	Parkinson disease	Parkinsonian syndromes frequently have autonomic involvement assessed with `95924`

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`95924`	Autonomic testing; combined parasympathetic and sympathetic function testing	Primary code describing joint testing of autonomic functions to evaluate dysautonomia
`95921`	Autonomic function testing; heart rate response to deep breathing and Valsalva and quantitative sudomotor axon reflex test (QSART) — physiologic components vary by code	Other autonomic testing components that may be performed in the same session or as separate elements depending on lab protocol
`95922`	Autonomic function testing; quantitative sudomotor axon reflex testing (QSART)	Focused sudomotor assessment commonly paired with combined testing to localize autonomic dysfunction
`95925`	Autonomic testing; beat-to-beat blood pressure and heart rate during tilt-table testing	Tilt-table testing is frequently performed alongside combined parasympathetic and sympathetic testing to provoke orthostatic symptoms
`96020`	Autonomic laboratory interpretation and report (example representing interpretation codes)	Professional interpretation and formal reporting are billed separately when allowed; complements the technical component of `95924`

CPT 95919: Quantitative Pupillary Light Reflex Measurement

CPT-95921-AUTONOMIC-FUNCTION-TESTING-ECG-RHYTHM-STRIP

CPT 95921: Autonomic Nervous System Function Testing

CPT-95922-AUTONOMIC-FUNCTION-SYMPATHETIC-TESTING

CPT 95922: Sympathetic Autonomic Function Testing

CPT-95923-SUDOMOTOR-FUNCTION-TEST-SWEAT-GLAND-INNERVATION

CPT 95923: Sudomotor Function Test for Sweat Gland Innervation

Frequently Asked Questions

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 95924: Combined Autonomic Function Testing, Parasympathetic and Sympathetic

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Billing Code Overview

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CPT 95924: Combined Autonomic Function Testing, Parasympathetic and Sympathetic

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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

CPT 95924: Combined Autonomic Function Testing, Parasympathetic and Sympathetic

Sign up for cpt 95924 policy alerts

Billing Code Overview

CPT 95924: Combined Autonomic Function Testing, Parasympathetic and Sympathetic

Sign up for cpt 95924 policy alerts

Billing Code Overview

Clinical & Coding Specifications

Clinical Context

Coding Specifications

Related Diagnoses

Related CPT Codes

Related Codes

What clinical procedure does CPT 95924 describe?

Where is CPT 95924 typically performed and what does the clinical workflow involve?

Which billing modifiers are relevant for 95924 and when might they be used?

Are there other CPT codes commonly associated with 95924?

Which ICD-10 diagnoses are commonly associated with ordering CPT 95924?

References

Clinical & Coding Specifications

Clinical Context

Coding Specifications

Related Diagnoses

Related CPT Codes

Related Codes

What clinical procedure does CPT 95924 describe?

Where is CPT 95924 typically performed and what does the clinical workflow involve?

Which billing modifiers are relevant for 95924 and when might they be used?

Are there other CPT codes commonly associated with 95924?

Which ICD-10 diagnoses are commonly associated with ordering CPT 95924?

References