Summary & Overview
CPT 61641: Intracranial Angioplasty and Balloon Dilatation, Additional Vessel
CPT code 61641 captures the performance of additional intracranial angioplasty and balloon dilatation on a second vessel in the same vascular territory after initial balloon dilatation for vasospasm. This code documents a multivessel endovascular intervention specifically addressing intracranial vasospasm, an acute vascular complication often encountered after subarachnoid hemorrhage or other cerebrovascular events. Accurate coding for this service is important for tracking utilization of advanced neurointerventional therapies and for national billing consistency.
Key payers in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of the clinical context for CPT code 61641, typical sites where the service is delivered, and what to expect in benchmarking and policy discussions. The publication outlines how the code differs from single-vessel angioplasty codes, highlights payer coverage considerations at a national level, and summarizes common modifiers and service-line associations where available.
This piece provides clinicians, billing professionals, and policy readers with context on coding intent, clinical circumstances that prompt multivessel intracranial angioplasty, and the types of documentation and service settings that typically accompany the procedure. Data not available in the input will be noted where applicable.
Billing Code Overview
CPT code 61641 describes a procedure in which, after performing balloon dilatation of an intracranial vasospasm in one vessel, the provider performs additional intracranial angioplasty and balloon dilatation to widen another intracranial vessel within the same vascular territory as the initial vessel.
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Service type: Endovascular intracranial angioplasty and balloon dilatation for treatment of intracranial vasospasm
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Typical site of service: Hospital inpatient or hospital outpatient interventional radiology/neurosurgical suite or hybrid operating room
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Clinical & Coding Specifications
Clinical Context
A typical patient is an adult admitted to the neurological ICU with a subarachnoid hemorrhage secondary to a ruptured cerebral aneurysm. After aneurysm repair (endovascular coiling or surgical clipping), the patient develops symptomatic delayed cerebral ischemia due to angiographically confirmed intracranial vasospasm in the anterior circulation. Despite medical therapy (hemodynamic augmentation, nimodipine), focal neurologic deficits persist and angiography demonstrates tight vasospasm of one intracranial vessel. The interventional neuroradiology or endovascular neurosurgery team performs balloon dilatation of that vessel. During the same endovascular session, additional angioplasty and balloon dilatation are performed in another intracranial vessel within the same vascular territory to restore luminal diameter and improve cerebral perfusion.
The clinical workflow includes pre-procedure informed consent and review of prior imaging (CT, CTA, diagnostic cerebral angiography). The patient is brought to the angiography suite, arterial access is obtained, diagnostic angiography is performed to localize vasospasm, and balloon microcatheters are navigated into the affected vessels. After sequential balloon dilatation of the initial vessel, a second intracranial vessel in the same vascular territory is treated with angioplasty and balloon dilatation during the same session. Hemostasis and access closure follow, with post-procedure neurologic monitoring in the ICU and follow-up imaging as indicated.
Coding Specifications
| Modifier | Description | When to Use |
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