Cerebrovascular Endovascular Embolization and Stents
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Clinical coverage policy governing prior-authorization, documentation, and medical necessity criteria for endovascular cerebrovascular procedures (embolization, angioplasty, stent placement, flow diverters) for members under Cigna benefit plans administered by eviCore. Applies to providers requesting authorization for cerebrovascular endovascular interventions.
No material clinical or coverage changes in this revision.
Coverage Criteria for Endovascular Cerebrovascular Procedures
Medically necessary indications for endovascular intracerebral treatment
Endovascular treatment of intracerebral pathology is medically necessary when recent clinical history documents any of the following:
See asymptomatic saccular aneurysm subcriteria for size and morphology.
Asymptomatic saccular aneurysm criteria
Coverage for asymptomatic saccular aneurysm requires ANY of the following:
Follow-up imaging or documented dysmorphic morphology required.
Endovascular treatment of intracerebral pathology — general indications
Covered when ANY of the following documented recent clinical findings are present:
Derived from general indications section.
Middle Meningeal Artery Embolization (MMAE) for chronic subdural hematoma
MMAE is considered medically necessary when ANY of the following clinical scenarios apply:
Document imaging measurement and clinical context for prior authorization.
Endovascular intervention for intracranial venous stenosis — IIH
Venous sinus stenting for IIH is medically necessary when ALL of the following are met:
All listed findings must be documented for medical necessity.
Venous stenting for pulsatile tinnitus (transverse venous sinus stenosis)
Venous stenting for pulsatile tinnitus is medically necessary when ALL of the following are present:
All listed findings must be documented for consideration of stenting for pulsatile tinnitus due to transverse venous sinus stenosis.
Intervention for recurrent intracranial venous stenosis after prior treatment for IIH
Intervention for recurrent stenosis is medically necessary in the setting of ANY of the following:
Either criterion alone supports medical necessity for intervention after prior venous stenting.
Balloon angioplasty and intracranial stent placement are explicitly excluded from coverage when performed as prophylactic percutaneous transluminal angioplasty of intracranial arteries after aneurysmal subarachnoid hemorrhage unless there is a concurrent diagnosis of ischemia in addition to subarachnoid hemorrhage. The procedural descriptors for CPT codes such as 61630 and 61635 note this noncoverage and the requirement for a dual diagnosis (subarachnoid hemorrhage plus ischemia) for consideration.
Endovascular treatment for intracranial atherosclerosis is not considered medically necessary and is listed as a non-indication. More broadly, endovascular intervention for other non-specified indications—such as evaluation or treatment of isolated headache without meeting specific disease criteria—is also not considered medically necessary.
Prophylactic percutaneous transluminal angioplasty of intracranial arteries performed after aneurysmal subarachnoid hemorrhage is listed as not covered in the procedural descriptions for intracranial balloon angioplasty and intracranial stent placement unless a dual diagnosis of subarachnoid hemorrhage and ischemia is documented.
Endovascular intervention for indications outside the specific, evidence‑based lists—such as treatment for headache alone when the criteria for IIH or pulsatile tinnitus are not met—is considered not medically necessary and therefore not covered.
Procedure Codes and Key Numeric Thresholds
| 61624 | Transcatheter permanent occlusion or embolization, central nervous system (intracranial, spinal cord) |
| 61630 | Balloon angioplasty, intracranial (e.g., atherosclerotic stenosis) |
| 61635 | Transcatheter placement of intravascular stent(s), intracranial |
| 37238 | Transcatheter placement of an intravascular stent(s), open or percutaneous; initial vein |
| 37239 | Each additional vein for transcatheter stent placement (list separately) |
| 37248 | Transluminal balloon angioplasty (except dialysis circuit); initial vein |
| 37249 | Transluminal balloon angioplasty (except dialysis circuit); each additional vein |
Prior Authorization, Documentation, and Provider Requirements
Prior authorization timing and submission requirements
Submit prior-authorization requests at least two weeks before the anticipated date of elective surgery and include the required documentation and recent imaging/clinical evaluation to support medical necessity.
- Submit at least 2 weeks prior to elective surgery
- Include required documentation and recent imaging/clinical evaluation
Document indication-specific clinical criteria in the PA request
Ensure the prior-authorization request documents the specific indication criteria required by the policy (for example: aneurysm size/morphology or symptomatic status; cSDH size or surgical context for MMAE; IIH diagnostic criteria and venous stenosis/pressure gradient for venous stenting).
- Match documentation to the indication-specific criteria listed in the policy (size, morphology, symptoms)
- Include context such as adjunct to surgery or prior intervention when applicable
Emergency/urgent exceptions to conservative management
Do not require a trial of conservative, provider-directed non-surgical management when the request documents an urgent or emergent condition (e.g., symptomatic or ruptured aneurysms, symptomatic carotid stenosis, crescendo TIAs, critical limb ischemia).
- Urgent/emergent documentation supported by imaging or clinical assessment exempts conservative therapy requirement
- Examples: critical limb ischemia, symptomatic carotid stenosis, crescendo TIAs, symptomatic or ruptured aneurysms
Document failed medical therapy before venous stenting
For IIH and pulsatile tinnitus due to venous sinus stenosis, prior authorization must include documentation of failed medical therapy (lifestyle changes, diuretics, and acetazolamide) prior to considering venous stenting.
- Document attempted lifestyle changes, diuretics, and acetazolamide therapy and evidence they failed
Required documentation to accompany prior-authorization requests
Include documentation that shows the proposed procedure matches the clinical need; the condition being treated; details of provider-directed conservative treatment (duration, frequency, response) when applicable; prior interventions and responses; lesion location and size; and recent (within 6 months) diagnostic imaging reports or clinical evaluation.
- Procedure proposed matching the clinical need
- Condition being treated
- Conservative treatment details (duration, frequency, response) when applicable
- Previous interventions and responses
- Lesion location and size
- Recent imaging reports or clinical evaluation (within 6 months)
IIH-specific documentation required for PA
For IIH venous stenting requests, provide documentation of papilledema on ocular exam, lumbar puncture opening pressure >25 cm H2O, failed medical therapy (lifestyle changes, diuretics, acetazolamide), venous sinus stenosis on imaging (>50%) or a trans-stenotic gradient >8 mmHg on diagnostic catheter venogram, and ability to tolerate dual antiplatelet therapy for 1 month.
- Papilledema on ocular exam
- Lumbar puncture opening pressure >25 cm H2O
- Evidence of failed medical therapy (lifestyle changes, diuretics, acetazolamide)
- Venous sinus stenosis >50% on MRV/CTV/venography OR pressure gradient >8 mmHg on catheter venogram
- Ability to tolerate dual antiplatelet therapy (ASA and clopidogrel) for 1 month
Pulsatile tinnitus documentation required for PA
For pulsatile tinnitus due to transverse venous sinus stenosis, include documentation of failed medical therapy, venous sinus stenosis >50% on MRV/CTV/venography or a pressure gradient >4 mmHg on diagnostic catheter venogram, and ability to tolerate dual antiplatelet therapy for 1 month.
- Evidence of failed medical therapy (lifestyle changes, diuretics, acetazolamide)
- Venous sinus stenosis >50% on MRV/CTV/venography OR pressure gradient >4 mmHg on catheter venogram
- Ability to tolerate dual antiplatelet therapy (ASA and clopidogrel) for 1 month
MMAE documentation requirements (cSDH size and clinical role)
For requests for middle meningeal artery embolization (MMAE), submit imaging measurement documenting chronic subdural hematoma size (≥8 mm for asymptomatic cSDH) and clarification of the clinical role (adjunct to surgical decompression, coagulopathy/antiplatelet patients, or prophylactic embolization after evacuation).
- Imaging measurement of cSDH size (≥8 mm for asymptomatic cases)
- State if MMAE is adjunct to surgical decompression, for coagulopathy/antiplatelet patients, or prophylactic after evacuation
Insufficient documentation may result in denial
Be aware that prior-authorization requests lacking required documentation—such as mismatch between proposed procedure and clinical need, missing condition details, absent conservative treatment information, prior intervention records, lesion size/location, or recent imaging/clinical evaluation—may be denied.
- Missing or incomplete documentation of procedure-clinical need match
- Absent conservative treatment details when applicable
- No recent (within 6 months) diagnostic imaging or clinical evaluation
- Incomplete prior intervention or lesion size/location information
Intracranial atherosclerosis — requests will be denied
Requests for endovascular treatment for intracranial atherosclerosis will be denied because endovascular treatment for intracranial atherosclerosis is not considered medically necessary.
- Endovascular treatment is not considered medically necessary for intracranial atherosclerosis
- Such requests will be denied
Background
Endovascular cerebrovascular procedures encompassed by this policy include coil embolization, balloon angioplasty, intracranial stent placement, and related endovascular techniques used to treat intracranial vascular pathology. Covered indications include ruptured aneurysm with subarachnoid hemorrhage, arteriovenous malformations, symptomatic aneurysms, persistent or recurrent aneurysm filling after prior intervention, and selected asymptomatic saccular aneurysms that meet size or morphology thresholds. The policy also defines specific criteria for middle meningeal artery embolization (including an imaging threshold of ≥8 mm for certain chronic subdural hematomas) and for venous sinus stenting in idiopathic intracranial hypertension and pulsatile tinnitus, which require documented stenosis on imaging and measured trans‑stenotic pressure gradients as detailed in the policy. Urgent or emergent cerebrovascular conditions (for example ruptured aneurysm) may bypass conservative management and should be documented when submitted for authorization.
Definitions
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