By Counterforce Health Team in Enhertu (fam-trastuzumab deruxtecan-nxki) —

How to Get Enhertu Covered by Aetna CVS Health in Pennsylvania: Complete Prior Authorization Guide with Appeals Process

Answer Box: Getting Enhertu Covered by Aetna CVS Health in Pennsylvania

Enhertu (fam-trastuzumab deruxtecan-nxki) requires prior authorization from Aetna CVS Health for all FDA-approved cancer indications. Your oncologist must submit documentation proving HER2-positive, HER2-low, or HER2-mutant status plus evidence of prior therapy failures. The fastest path: gather HER2 testing results and treatment records, submit via Aetna's Enhertu precertification form, and follow up in 72 hours. If denied, Pennsylvania's new external review program has overturned 53% of appeals in 2024.

First step today: Contact your oncology team to request your HER2 pathology report and prior treatment records—these are required for any Enhertu approval.

Table of Contents

  1. Coverage Basics
  2. Prior Authorization Process
  3. Timing and Deadlines
  4. Clinical Criteria Requirements
  5. Costs and Financial Support
  6. Denials and Appeals
  7. Pennsylvania External Review Process
  8. Specialty Pharmacy Requirements
  9. Frequently Asked Questions
  10. Troubleshooting Common Issues

Coverage Basics

Is Enhertu Covered by Aetna CVS Health?

Yes, but with restrictions. Enhertu is classified as a non-formulary specialty medication requiring prior authorization across all Aetna CVS Health plans in Pennsylvania. Coverage applies to FDA-approved indications including:

  • HER2-positive breast cancer (after prior anti-HER2 therapy)
  • HER2-low and HER2-ultralow breast cancer (after prior chemotherapy)
  • HER2-mutant non-small cell lung cancer (after prior platinum-based therapy)
  • HER2-positive gastric/gastroesophageal junction cancer (after prior trastuzumab-based therapy)

All fills must go through CVS Specialty Pharmacy once approved.

Which Pennsylvania Plans Are Affected?

This guide covers commercial Aetna plans purchased through employers, Pennie (Pennsylvania's marketplace), or directly from Aetna CVS Health. Note: Different rules apply for Aetna Better Health (Pennsylvania Medicaid) and Medicare Part D plans.

Prior Authorization Process

Step-by-Step: Fastest Path to Approval

  1. Gather Required Documents (Patient/Clinic - Same Day)
    • HER2 testing pathology report with IHC/ISH results
    • Complete treatment history with dates, drugs, doses, and outcomes
    • Current staging and performance status
    • ICD-10 diagnosis codes
  2. Complete Aetna's Enhertu Form (Clinic - 1-2 Days)
  3. Submit Application (Clinic - Same Day)
    • Fax: 888-267-3277 (Enhertu-specific line)
    • Portal: Availity or Aetna provider portal
    • Phone: 866-752-7021 for status checks
  4. Track Review Timeline (30-45 Days Standard)
    • Standard decisions: 30-45 business days
    • Expedited (urgent): 72 hours with physician certification
  5. CVS Specialty Enrollment (3-5 Days Post-Approval)
    • Call 1-800-237-2767 for specialty pharmacy setup
    • Coordinate infusion site and scheduling
95% of complete applications approved within 24 hours per CVS Health data

Timing and Deadlines

Process Stage Timeline Action Required
Document gathering Same day Patient requests records from prior oncologists
PA submission 1-2 days Clinic completes and submits forms
Aetna review 30-45 days (standard)
72 hours (expedited)		 None; clinic may call for status
CVS Specialty setup 3-5 days Patient enrollment and site coordination
Internal appeal 180 days to file
30-60 days for decision		 Patient/clinic submits additional evidence
PA external review 4 months to file
45 days for decision		 Patient files with PA Insurance Department

Clinical Criteria Requirements

Coverage at a Glance

Requirement What It Means Where to Find It Source
HER2 Testing Confirmed HER2-positive (3+ IHC or ISH+), HER2-low (1-2+ IHC), or HER2-mutant status Pathology report from tumor biopsy Aetna Clinical Policy 0966
Prior Therapy Documented failure/intolerance of step therapy per indication Treatment records with dates and outcomes Aetna Enhertu Form
Prescriber Board-certified oncologist or hematologist Provider credentials on file Aetna PA Requirements
ILD Monitoring Plan for interstitial lung disease surveillance Baseline pulmonary assessment and imaging schedule FDA labeling requirement

Medical Necessity Letter Checklist

Your oncologist's letter should include:

  • Specific diagnosis with ICD-10 codes
  • HER2 status with testing methodology and results
  • Prior treatments with drug names, dates, duration, and reason for discontinuation
  • FDA indication match citing specific approved use
  • ILD monitoring plan including baseline HRCT and follow-up schedule
  • Alternative therapies and why they're inappropriate
  • Treatment goals and expected duration
Clinician Corner: Reference NCCN Guidelines and FDA prescribing information to strengthen medical necessity arguments. Include specific biomarker values (e.g., "HER2 3+ by IHC, confirmed by ISH") rather than general statements.

Costs and Financial Support

While specific Pennsylvania Aetna copay amounts aren't publicly available, specialty non-formulary medications typically involve:

  • Deductible: Applied before coverage begins
  • Coinsurance: 25-33% of drug cost after deductible
  • Copay: Fixed amount (varies by plan tier)

Reducing Out-of-Pocket Costs

  1. ENHERTU4U Copay Program
    • Eligible for commercial insurance (not Medicare/Medicaid)
    • May reduce copay to $25 per treatment
    • Apply at manufacturer website
  2. Foundation Assistance
    • Patient Access Network Foundation
    • Good Days Foundation
    • CancerCare Co-Payment Assistance
  3. CVS Specialty Support
    • Financial counselors available at 1-800-237-2767
    • Payment plans and assistance programs

Denials and Appeals

Common Denial Reasons & Fixes

Denial Reason How to Overturn Required Documents
Missing HER2 testing Submit complete pathology report IHC 3+ or ISH+ results with methodology
Step therapy not met Document prior treatment failures Detailed records showing progression/intolerance
"Experimental/investigational" Cite FDA approval and guidelines FDA labeling, NCCN compendia references
Dose/frequency exceeded Justify weight-based dosing Patient weight, BSA calculation, dosing rationale
Site of care restriction Request outpatient infusion exception Facility accreditation, patient safety factors

Internal Appeals Process

  1. File Within 180 Days of denial letter
  2. Submit New Evidence that wasn't in original PA
  3. Request Peer-to-Peer review with Aetna medical director
  4. Timeline: 30-60 days for standard appeals
  5. Contact: Member services at number on insurance card

Pennsylvania External Review Process

Pennsylvania launched its Independent External Review Program in January 2024, providing a powerful tool for overturning Aetna denials.

Key Statistics

  • 53% success rate in first year of operation
  • 259 out of 517 appeals resulted in coverage
  • Covers medical necessity and experimental treatment denials

How to File External Review

  1. Complete Internal Appeal First - Must receive Final Adverse Benefit Determination letter from Aetna
  2. File Within 4 Months of final denial
  3. Submit Online at PA Insurance Department portal
  4. Include Documentation:
    • Final denial letter from Aetna
    • Medical records supporting necessity
    • Physician statement on urgency/medical need

External Review Timelines

Review Type Decision Timeline When to Use
Standard 45 days from assignment Most denials
Expedited 72 hours from assignment Serious jeopardy to health/life
From Our Advocates: We've seen Pennsylvania external reviews succeed when patients include recent clinical studies showing Enhertu's effectiveness for their specific cancer type, especially for newer indications like HER2-low breast cancer. The independent physicians reviewing these cases often overturn denials when presented with current evidence that wasn't available when the insurer's policy was written.

Specialty Pharmacy Requirements

Why CVS Specialty?

Aetna requires most specialty medications, including Enhertu, to be dispensed through CVS Specialty Pharmacy for:

  • Cold chain management and proper storage
  • Patient monitoring and education
  • Coordination with infusion sites
  • Insurance benefit optimization

Setting Up CVS Specialty

  1. Automatic Transfer occurs after PA approval
  2. Patient Enrollment via 1-800-237-2767
  3. Site Coordination with your infusion center
  4. Delivery Scheduling typically 2-3 days before treatment

Frequently Asked Questions

Q: How long does Aetna prior authorization take for Enhertu in Pennsylvania? A: Standard review is 30-45 days, but expedited review for urgent cases is 72 hours. Complete applications with all required documentation are approved faster.

Q: What if Enhertu is non-formulary on my Aetna plan? A: Non-formulary status doesn't prevent coverage—it means prior authorization is required. Focus on meeting clinical criteria rather than formulary tier.

Q: Can I request an expedited appeal if my cancer is progressing? A: Yes. Your oncologist can certify that delays would seriously jeopardize your health, triggering 72-hour review timelines for both PA and appeals.

Q: Does Pennsylvania's external review cost anything? A: No. The Pennsylvania Insurance Department provides external review at no cost to patients.

Q: What if I've already started Enhertu and then get denied? A: Continue treatment if medically necessary while appealing. Document all out-of-pocket costs for potential reimbursement if appeal succeeds.

Q: Can I use manufacturer copay assistance with Aetna? A: Yes, for commercial Aetna plans. Medicare and Medicaid members are not eligible for manufacturer copay programs.

Troubleshooting Common Issues

Portal Problems

  • Availity down: Use fax submission to 888-267-3277
  • Missing forms: Download directly from Aetna forms page
  • Status unknown: Call 866-752-7021 with PA reference number

Communication Gaps

  • No response from Aetna: Follow up every 5 business days during review period
  • CVS Specialty not contacted: Call member services to verify PA approval status
  • Clinic staff unclear: Request to speak with prior authorization specialist

When to Escalate

Contact the Pennsylvania Insurance Department if:

  • Aetna violates review timelines (>45 days standard, >72 hours expedited)
  • You suspect improper denial reasons
  • Internal appeals process seems unfair

Pennsylvania Insurance Department Consumer Services

Counterforce Health helps patients and clinicians navigate complex prior authorization processes by turning insurance denials into targeted, evidence-backed appeals. Our platform analyzes denial letters, identifies specific coverage criteria, and generates point-by-point rebuttals using payer-specific workflows and clinical evidence.

Sources & Further Reading

Disclaimer: This information is for educational purposes only and does not constitute medical or legal advice. Coverage policies vary by plan and may change. Always verify current requirements with your insurance company and consult your healthcare team for medical decisions. For personalized assistance with appeals, consider consulting Counterforce Health or contacting Pennsylvania's consumer assistance resources.

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