CurrentBlue Cross Blue Shield - Rhode IslandPolicy N/A

Extracranial–intracranial (EC‑IC) arterial bypass / anastomosis coverage criteria

Defines coverage and medical necessity criteria for anastomosis of extracranial‑intracranial arteries (EC‑IC bypass) for BCBSRI members, including distinctions for atherosclerotic indications and payer products.

Policy Summary

PayerBlue Cross Blue Shield - Rhode Island

PolicyExtracranial–intracranial (EC‑IC) arterial bypass / anastomosis coverage criteria

Policy CodePolicy N/A

Change TypeNo material change

Effective DateN/A

Next Review DateN/A

Key ActionObtain prior authorization for atherosclerosis cases (required for Medicare Advantage; recommended for Commercial) via the online tool for participating providers.

SourceLink

POLICY UPDATE CHANGES

No material clinical or coverage changes in this revision.

1not-covered code count

2product lines discussed

1985trial year cited

4provider updates listed

Coverage and Medical Necessity Criteria

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Coverage by indication

General coverage: Anastomosis of the extracranial-intracranial arteries is covered for all conditions other than atherosclerosis.

From medical criteria in policy.

Atherosclerosis — Medicare Advantage & Commercial: For ischemic cerebrovascular disease of the carotid or middle cerebral arteries (including treatment or prevention of strokes) due to atherosclerosis, EC-IC arterial bypass surgery (CPT 61711) is not a covered procedure for Medicare Advantage plans and is not medically necessary for Commercial products because evidence is insufficient to show improvement in net health outcome.

Policy cites lack of demonstrated benefit; not reasonable and necessary for this indication.

Other indications: Anastomosis of the extracranial-intracranial arteries for indications other than atherosclerosis are covered.

Explicitly stated in policy.

Extracranial–intracranial (EC‑IC) arterial bypass surgery is not considered reasonable and necessary when performed as a treatment for ischemic cerebrovascular disease of the carotid or middle cerebral arteries. The available evidence does not demonstrate that bypass of narrowed intracranial arterial segments provides improved net health outcomes compared with no surgical intervention in this indication, and therefore the procedure is excluded under the relevant coverage standards.

Provider Responsibilities and Authorization

Prior Authorization

Prior Authorization Required

Prior authorization is required for atherosclerosis for Medicare Advantage plans and is recommended for Commercial products. Obtain authorization via the payer's web-based tool for participating providers.

Applies to procedures related to atherosclerosis

Documentation Required

Verify Member Benefits

Benefits may vary between groups/contracts. Verify coverage and benefits for the member before scheduling; refer to the member's Benefit Booklet, Evidence of Coverage, or Subscriber Agreement for specific contract terms and any applicable limitations.

Denial Risk

Non-Covered Indication / Denial Risk

Extracranial–intracranial (EC-IC) arterial bypass surgery performed as treatment for ischemic cerebrovascular disease of the carotid or middle cerebral arteries (including treatment or prevention of strokes) is not covered for Medicare Advantage plans and is considered not medically necessary for Commercial products — claims may be denied.

Non-covered/denial risk: EC-IC bypass for ischemic cerebrovascular disease of carotid/MCA

Note

Provider Actions

Provider action: ensure prior authorization is obtained when required, verify member benefits, and document the specific indication. For EC-IC bypass, document the indication clearly and confirm whether the procedure is for other indications (which may be covered) versus treatment/prevention of stroke from carotid or MCA disease (which is not covered/not medically necessary).

Obtain prior authorization via web-based tool when applicable
Confirm and document indication (ischemic carotid/MCA vs other)
Refer to member's Benefit Booklet/Evidence of Coverage for benefit specifics

Clinical Background

Intracranial atherosclerotic disease refers to narrowing or obstruction of intracranial arteries from atheromatous plaque, which can lead to transient ischemic attacks or ischemic stroke. Standard management emphasizes medical therapy—antiplatelet or anticoagulant treatment and control of vascular risk factors—because EC‑IC arterial bypass was hypothesized to improve cerebral blood flow but clinical evidence has not shown a net benefit. For ischemic disease of the carotid or middle cerebral arteries due to atherosclerosis, EC‑IC bypass is therefore not considered reasonable and necessary and is not covered or is considered not medically necessary for the payer products addressed in this policy.

Definitions

Definition — EC‑IC arterial bypass

TermEC‑IC arterial bypass

DefinitionAnastomosis of the extracranial‑intracranial arteries: surgical craniotomy and arterial anastomosis connecting extracranial arteries to intracranial arteries to bypass narrowed segments.

Key procedural stepsCraniotomy at the affected area, identification and dissection of donor and recipient arteries, and microvascular arterial anastomosis.

Typical purposeTo create an alternate pathway for cerebral blood flow by connecting extracranial to intracranial arteries.