Cerebrovascular Intervention (Endovascular Embolization and Stents)
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This policy governs medical necessity and prior-authorization guidance for cerebrovascular endovascular procedures (embolization, angioplasty, stents, flow diverters) for members covered under Cigna plans administered with EviCore review. It affects providers requesting authorization for cerebrovascular endovascular interventions.
No material clinical or coverage changes in this revision.
Coverage Criteria for Cerebrovascular Endovascular Procedures
inv-01: Endovascular Treatment of Intracerebral Pathology — Medically Necessary Indications
Endovascular treatment of intracerebral pathology is considered medically necessary when recent clinical history documents any of the following:
inv-02: Endovascular treatment of intracerebral pathology — medically necessary criteria
Considered medically necessary when recent clinical history documents any of the following:
inv-03: Middle meningeal artery embolization (MMAE) — medically necessary criteria
MMAE is considered medically necessary for any of the following clinical scenarios:
inv-04: Endovascular intervention for intracranial venous stenosis — IIH criteria
For idiopathic intracranial hypertension (all of the following must be present):
inv-05: Venous stenting for pulsatile tinnitus — criteria
Considered medically necessary when ALL of the following are present:
inv-06: Intervention for recurrent intracranial venous stenosis after prior treatment
Prophylactic percutaneous transluminal angioplasty of intracranial arteries after aneurysmal subarachnoid hemorrhage is not covered unless there is a concurrent diagnosis of both subarachnoid hemorrhage and ischemia. This limitation applies to intracranial balloon angioplasty and intracranial stent placement when performed prophylactically in the post-aneurysmal subarachnoid hemorrhage setting.
Endovascular treatment for intracranial atherosclerosis is explicitly stated as not considered medically necessary. Additionally, endovascular interventions proposed for non-specific indications such as headache (without other supporting clinical or imaging findings) are stated as not medically necessary.
The reference-list excerpts provided do not include additional explicit coverage exclusions beyond those stated elsewhere in the policy text; the citation list is limited to supporting literature and does not itself define exclusions.
Endovascular intervention for intracranial venous stenosis is addressed with specific, condition‑based criteria (e.g., for IIH and for pulsatile tinnitus). By contrast, interventions for intracranial atherosclerosis and for other non‑specified indications (including isolated headache) are not recommended and are considered not medically necessary.
Within the literature citation excerpts shown there are no standalone statements framed as policy-level 'not medically necessary' determinations; those determinations are present in the policy text and exclusions sections rather than in the reference citations.
Coding and Size/Threshold Key Facts
| 61624 | Transcatheter permanent occlusion or embolization (e.g., for tumor destruction, to achieve hemostasis, to occlude a vascular malformation), including all radiological supervision and interpretation, intraprocedural roadmapping, and imaging guidance necessary to complete the intervention |
| 61630 | Balloon angioplasty, intracranial (e.g., atherosclerotic stenosis), percutaneous |
| 61635 | Transcatheter placement of intravascular stent(s), intracranial (e.g., atherosclerotic stenosis), including balloon angioplasty if performed |
| 37238 | Transcatheter placement of an intravascular stent(s), open or percutaneous; initial vein |
| 37239 | Transcatheter placement of an intravascular stent(s), each additional vein (List separately in addition to code for primary procedure) |
| 37248 | Transluminal balloon angioplasty, initial vein (except dialysis circuit), including all imaging and radiological supervision and interpretation necessary to perform the angioplasty within the same vein |
| 37249 | Transluminal balloon angioplasty, each additional vein (except dialysis circuit) (List separately in addition to code for primary procedure) |
Prior Authorization, Documentation, and Provider Requirements
Prior authorization timing and required materials
Submit prior-authorization requests at least two weeks before the anticipated date of elective cerebrovascular endovascular procedures and include all required documentation elements for vascular intervention requests.
- Include proposed procedure and how it matches the clinical need
- Specify the condition being treated and relevant prior interventions and responses
- Provide detailed conservative treatment (duration, frequency, response) when applicable
- Attach recent (within 6 months) diagnostic imaging reports and a recent clinical evaluation documenting symptoms and physical exam
Prior authorization for cerebrovascular endovascular procedures
Prior authorization is expected for endovascular intracerebral procedures; requests must include the clinical history, imaging measurements/measurements (e.g., aneurysm size, cSDH thickness, venous stenosis percentage), and evidence that the coverage criteria are met.
- Document aneurysm size (e.g., ≥5 mm or ≥3 mm with dysmorphic features or growth) or cSDH thickness (≥8 mm) when applicable
- For venous procedures, include quantified stenosis (>50%) or measured pressure gradients (>8 mmHg for IIH, >4 mmHg for pulsatile tinnitus)
- Provide evidence of prior failed therapies when required by the criteria
Prior authorization not specified in excerpt
Some portions of the source are reference citations only and do not specify prior-authorization rules; do not assume additional authorization requirements beyond those explicitly stated in the documentation and prior-auth sections.
Urgent/emergent exceptions to conservative management
Do not require prior conservative, non‑surgical management when the request documents an urgent or emergent condition (examples: symptomatic carotid stenosis, critical limb ischemia, crescendo TIAs, symptomatic or ruptured aneurysms).
Conservative therapy required before venous stenting
For IIH and pulsatile tinnitus related to venous sinus stenosis, prior conservative medical therapy must have failed before venous stenting will be considered.
- Failed medical therapy includes lifestyle changes, diuretics, and acetazolamide therapy
- Document inability to control symptoms with these measures prior to authorization for stenting
No step therapy requirements present in these excerpts
No formal step therapy program (beyond the condition-specific conservative therapy requirements noted for venous stenting and the urgent/emergent exceptions) is specified in the provided excerpts.
Required documentation (general prior-auth documentation list)
Prior-authorization requests must include the elements listed for vascular intervention requests: proposed procedure matching clinical need; condition being treated; detailed conservative treatment and response; prior interventions and response; anatomic measurements (aneurysm size, cSDH thickness) when relevant; and recent (within 6 months) diagnostic imaging reports and clinical evaluation.
- Attach recent (within 6 months) imaging reports (CTA/CTV, MRA/MRV, arteriogram/venogram, duplex, IVUS)
- Provide recent clinical evaluation documenting symptoms and physical exam findings
IIH venous stenting documentation
For IIH patients considered for venous stenting, include documentation of papilledema on ocular exam, lumbar puncture opening pressure (>25 cm H2O), prior failed medical therapy, imaging demonstrating venous sinus stenosis (>50% on MRV/CTV/venography) or a significant pressure gradient (>8 mmHg), and the patient’s ability to tolerate dual antiplatelet therapy.
- Document papilledema on ocular exam
- Provide lumbar puncture opening pressure (>25 cm H2O)
- Show failed medical therapy (lifestyle changes, diuretics, acetazolamide)
- Include imaging demonstrating >50% venous sinus stenosis or pressure gradient >8 mmHg
- Confirm ability to tolerate ASA and clopidogrel for 1 month
Aneurysm and cSDH documentation (imaging measurements required)
For aneurysm and chronic subdural hematoma interventions, include imaging measurements and symptom documentation: aneurysm size thresholds (e.g., ≥5 mm or ≥3 mm with dysmorphic features/growth) and cSDH thickness (e.g., ≥8 mm), plus symptom description, prior interventions, and relevant coagulation/anticoagulation status.
- Report aneurysm size and any evidence of growth or dysmorphic features
- Provide cSDH measurement on imaging (≥8 mm when applicable)
- Document symptoms (visual changes, headache), prior treatments, and coagulopathy or anticoagulation status
No documentation requirements specified in these reference-list excerpts
Certain reference-list chunks supply literature citations only and do not specify documentation requirements; do not infer additional documentation obligations from these citations.
Documentation-based denials
Incomplete prior-authorization documentation—such as missing demonstration that the proposed procedure matches the clinical need, absent documentation of conservative treatment or prior interventions, or lack of recent (within 6 months) imaging/clinical evaluation—may lead to denial of the request.
- Ensure all required imaging and clinical notes within 6 months are included
- Include clear documentation of prior conservative therapy and responses when applicable
- Provide prior intervention details and outcomes when relevant
Intracranial atherosclerosis not indicated
Requests for endovascular treatment of intracranial atherosclerosis are explicitly stated as not medically necessary and are subject to denial.
No authorization or denial criteria present in these literature excerpts
Some chunks contain literature citations only and do not include authorization or denial criteria; do not treat these citation-only sections as policy requirements.
Background
Endovascular procedures for cerebrovascular pathology encompass embolization, balloon angioplasty, stent placement, and flow diversion. These interventions are used to treat conditions such as arteriovenous malformations (any size), ruptured or symptomatic aneurysms, persistent or recurrent aneurysm filling after prior intervention, highly vascular tumors, chronic subdural hematoma (including consideration of middle meningeal artery embolization for asymptomatic cSDH ≥ 8 mm or symptomatic cSDH), and intracranial venous stenosis when prespecified diagnostic and physiologic criteria are met. Prior authorization is implied for these procedures and requests should include relevant clinical history and recent imaging measurements to demonstrate that the policy criteria are met.
Definitions and Key Terms
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