Summary & Overview
CPT 95921: Autonomic Nervous System Function Testing
CPT code 95921 represents evaluation of autonomic nervous system function using ECG rhythm strips to record heart rate and rhythm responses to provocation maneuvers such as deep breathing, the Valsalva maneuver, and standing. This physiologic testing helps clinicians identify abnormalities in involuntary cardiovascular control that can underlie syncope, orthostatic intolerance, neuropathies, and other disorders. Nationally, such testing informs diagnosis and management of autonomic disorders and impacts utilization in neurology and cardiology outpatient settings.
Key payers discussed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise clinical description, typical sites of service, and the common modifiers associated with reporting the service. The publication also provides context on clinical indications and expected documentation elements. Where available, benchmarking and payer coverage notes summarize how major commercial payers and Medicare commonly approach authorization and reimbursement for autonomic function testing. Data not available in the input is noted where specific payer policies or procedural volumes would normally be provided.
Billing Code Overview
CPT code 95921 describes an evaluation of autonomic nervous system function using an electrocardiogram (ECG) rhythm strip to record heart rate and rhythm responses to physiologic maneuvers such as deep breathing, the Valsalva maneuver, and standing (for example, the 30:15 ratio test). This service documents how involuntary cardiovascular control responds to standardized stimuli and is focused on assessing parasympathetic and sympathetic function.
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Service type: Autonomic nervous system function testing using ECG rhythm strips
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Typical site of service: Ambulatory clinic or hospital outpatient setting where ECG monitoring and standardized physiologic maneuvers can be performed
Clinical & Coding Specifications
Clinical Context
A typical patient is an adult referred to neurology or autonomic clinic for evaluation of unexplained syncope, orthostatic intolerance, dizziness on standing, or suspected autonomic neuropathy. The clinician reviews history, medications, and vital signs, then obtains baseline vital signs and places electrocardiogram leads to record heart rhythm. The provider performs standardized autonomic function maneuvers while recording an ECG rhythm strip: controlled deep breathing to assess respiratory sinus arrhythmia, the Valsalva maneuver to evaluate baroreflex function, and active stand testing (including the 30:15 ratio) to assess heart rate response to postural change. The workflow includes explanation and consent, preparation of ECG equipment, performance of maneuvers with continuous ECG monitoring, documentation of heart rate and rhythm responses, and interpretation of results. Typical sites of service are outpatient neurology or cardiology clinics, dedicated autonomic labs, or hospital outpatient departments. The service type is diagnostic autonomic testing using ECG rhythm strip monitoring to evaluate autonomic cardiovascular reflexes.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
25 | Significant, separately identifiable evaluation and management service by the same physician on the same day as the procedure | Use when an unrelated E/M encounter is provided the same day as 95921 and documented separately |