Acute Ischemic Stroke: Treatments — CPB 0789 | AETNA Coverage Update

Aetna modified CPB 0789 for acute ischemic stroke treatments, effective November 21, 2025. Here's what billing teams need to know before submitting claims.

Aetna, a CVS Health company, updated this coverage policy to clarify which acute ischemic stroke (AIS) interventions meet medical necessity standards and which it classifies as experimental. The policy directly affects CPT codes 61645, 37184, 37185, 97810–97814, 64568, 64569, 61885, 61886, and 61888, along with HCPCS codes including C1757, C1876, J3246, and J0885–J0888. If your facility bills for stroke intervention procedures under ICD-10 codes I63.0–I63.9, review your charge capture before November 21, 2025.

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Quick-Reference Table

Field	Detail Copy
Payer	Aetna
Policy	Acute Ischemic Stroke: Treatments
Policy Code	CPB 0789
Change Type	Modified
Effective Date	November 21, 2025
Impact Level	High
Specialties Affected	Neurology, Neurosurgery, Interventional Radiology, Vascular Surgery, Emergency Medicine
Key Action	Audit open claims for experimental AIS treatments — especially tirofiban (J3246), erythropoietin (J0885–J0888), minocycline (J2265), and vagus nerve stimulation (64568) — before November 21, 2025

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Aetna Acute Ischemic Stroke Coverage Criteria and Medical Necessity Requirements 2025

The Aetna acute ischemic stroke coverage policy under CPB 0789 draws a sharp line between two covered interventions and a long list of treatments it will not pay for. Your prior authorization workflow and clinical documentation need to match those two narrow covered indications exactly.

Covered Indication 1: Endovascular thrombectomy with a retrievable stent

Aetna covers endovascular therapy using a retrievable stent — devices like the Solitaire FR or Trevo retriever — when all four of these criteria are met:

All four criteria must be documented. Miss one and you're looking at a claim denial. The 12-hour window is hard. Aetna does not extend it based on clinical judgment alone. Bill CPT 61645 (percutaneous arterial transluminal mechanical thrombectomy, intracranial) or 37184/37185 for non-intracranial mechanical thrombectomy, and pair device claims with HCPCS C1757 (thrombectomy catheter), C1876 (stent), C1884 (embolization protection), and C1887 (guiding catheter) as appropriate.

Covered Indication 2: Intra-arterial spasmolytics or calcium-channel blockers for vasospasm

Aetna also covers intra-arterial infusion of spasmolytics (e.g., papaverine) or calcium-channel blockers (e.g., nicardipine) into the intracranial arteries — but only for one specific scenario: medically refractory symptomatic delayed cerebral ischemia (cerebral vasospasm) after aneurysmal subarachnoid hemorrhage.

The ICD-10 codes that support this indication are I67.82 (cerebral ischemia) and I67.841–I67.848 (cerebral vasospasm and vasoconstriction). Document "medically refractory" explicitly in the medical record. Prophylactic use of the same drugs in the same arteries after subarachnoid hemorrhage is classified as experimental. The distinction between therapeutic and prophylactic use is exactly the kind of documentation gap that triggers denial.

For prior authorization purposes, be ready to show imaging evidence of vasospasm and documentation of failed medical management before the procedure. Reimbursement for intra-arterial infusions in this context flows through CPT 37184/37185 and 61645 depending on the vascular territory and approach.

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Aetna Acute Ischemic Stroke Exclusions and Non-Covered Indications

This is where CPB 0789 will cost you money if your billing team isn't current. Aetna classifies 23 AIS treatments as experimental, investigational, or unproven. Several of them have active CPT and HCPCS codes that your charge capture might be submitting without realizing coverage is denied outright.

The high-exposure items:

The real issue here is that many of these treatments are legitimate parts of inpatient stroke care. The clinical team uses them. The billing team submits them. But without a covered indication under this coverage policy, Aetna will not reimburse.

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Coverage Indications at a Glance

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Aetna Acute Ischemic Stroke Billing Guidelines and Action Items 2025

Copy Action Items

If you have high stroke volume, a mix of inpatient and interventional billing, or active protocols using any of the excluded treatments, loop in your compliance officer before the effective date. The list of excluded treatments in CPB 0789 is long, and the financial exposure across a busy stroke center is real.

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CPT, HCPCS, and ICD-10 Codes for Acute Ischemic Stroke Treatments Under CPB 0789

Covered CPT Codes (When Selection Criteria Are Met)

Code	Type	Description Copy
37184	CPT	Primary percutaneous transluminal mechanical thrombectomy, noncoronary, arterial or arterial bypass
37185	CPT	Second and all subsequent vessel(s) within the same vascular family (add-on)
61645	CPT	Percutaneous arterial transluminal mechanical thrombectomy and/or infusion for thrombolysis, intracranial

Covered HCPCS Device Codes (Thrombectomy and Infusion Procedures)

Not Covered / Experimental CPT Codes

Not Covered / Experimental HCPCS Codes

Key ICD-10-CM Diagnosis Codes

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