Short answer: Step therapy requires trying cheaper weight loss medications before insurers approve Zepbound. Common requirements: phentermine (3 months), Contrave (3 months), or Wegovy (6 months). Not all insurers require it—Aetna doesn't. If you've already been denied, you can appeal with prior medication history or medical exceptions.
What is step therapy for Zepbound?
Step therapy (also called "fail first") means you must try and fail on alternative medications before your plan will cover Zepbound:
- Most require 1-2 medications for 3-6 months each
- Common drugs: phentermine, Contrave, Qsymia, Wegovy
- Prior medication history may satisfy requirements without new trials
- 65%+ of step therapy appeals succeed with proper documentation
Who this guide is for
Patients starting the PA process who need to understand step therapy requirements, those already denied who want to appeal, or anyone looking to request an exception based on prior medication history or medical necessity.
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UNDERSTANDING THE BASICS
What Is Step Therapy?
Step therapy (also called "fail first") is an insurance requirement where you must try and fail on cheaper weight loss medications before your insurer will approve Zepbound. It's one of the most common barriers to Zepbound coverage.[1]
The "Fail First" Rule
Step therapy requires you to try cheaper medications before your insurer will cover Zepbound. Even if your doctor prescribes Zepbound as the best option for you, insurers may deny it until you've "failed" other drugs first. This is primarily a cost-control measure—Zepbound costs over $1,000/month while alternatives can cost under $50/month.
Does Your Insurer Require Step Therapy?
Not all insurers require it—Aetna, for example, only requires lifestyle documentation, not medication trials. Check the insurer table below to see your plan's specific requirements.
How Step Therapy Works
You Request Zepbound
Your doctor submits a prior authorization for Zepbound.
Insurer Denies (Step Therapy Required)
The insurer says you must try other medications first. Your denial letter lists which drugs qualify.
You Try Required Medications
You take the step therapy drugs for the required duration (usually 3-6 months each).
Document the Outcome
Your doctor documents that the step therapy drug was ineffective (didn't produce sufficient weight loss) or intolerable (caused side effects you couldn't manage).
Resubmit for Zepbound
With step therapy satisfied, your doctor resubmits the PA for Zepbound with documentation of prior trials.
The good news: Over 30 states have step therapy override laws that can help you skip these requirements. And with the right documentation, you can appeal successfully even without them.[4]
WHAT YOU MAY NEED TO TRY FIRST
Common Step Therapy Drugs
These are the most common medications insurers require before approving Zepbound:
| Medication | Trial Duration | Cost | Common Side Effects |
|---|---|---|---|
| Phentermine | 3 months | $15-30/mo | Increased heart rate, insomnia, dry mouth |
| Contrave (naltrexone/bupropion) | 3 months | $100-200/mo | Nausea, constipation, headache |
| Qsymia (phentermine/topiramate) | 3 months | $150-250/mo | Tingling, constipation, dry mouth |
| Saxenda (liraglutide) | 3-6 months | $1,000+/mo | GI issues (nausea, diarrhea) |
| Wegovy (semaglutide) | 6 months | $1,300+/mo | GI issues, another GLP-1 (often preferred) |
Wegovy Is Increasingly Required
Many insurers—especially those whose PBMs prefer Wegovy—now require you to try Wegovy for up to 6 months before approving Zepbound.[2] If you don't respond well to Wegovy, that's strong documentation for Zepbound.
What Counts as "Failure"?
To satisfy step therapy, you need to document that the medication either:
- Didn't work — You took it for the required duration but achieved less than 5% weight loss
- Caused intolerable side effects — Side effects severe enough that you couldn't continue
- Is contraindicated — You have a medical condition that makes the drug unsafe (e.g., uncontrolled hypertension for phentermine)
WHAT EACH INSURER REQUIRES
Step Therapy by Insurer
Step therapy requirements vary significantly by insurer:
| Insurer | Step Therapy? | Medications Required |
|---|---|---|
| Aetna | No medication step therapy | Only 6 months lifestyle modification[3] |
| UnitedHealthcare | Yes (some plans/indications) | Details vary by plan; no drug step found in UHC's weight-loss policy (2026 P 1114-23)—check your plan[5] |
| CVS Caremark | Varies by plan | Since October 1, 2026, Zepbound is back on CVS Caremark’s commercial template formularies as an additional preferred option (plan sponsors can customize) (July 2025 – September 2026, Wegovy was preferred and Zepbound was nonpreferred or excluded on some of its most common commercial formularies). Some plans may require trying another drug first; check your plan’s criteria[2] |
| Cigna | Varies by plan | May require phentermine, Contrave, or Wegovy |
| BCBS | Varies by affiliate | Varies widely—check your specific plan |
| Kaiser | Yes | Typically requires phentermine and/or Contrave |
Aetna Advantage
Aetna is one of the more favorable insurers for Zepbound coverage. They require no medication step therapy—just 6 months of documented lifestyle modification (diet and exercise).
For complete PA requirements by insurer, see our detailed requirements guide.
VALID EXCEPTIONS
When You Can Skip Step Therapy
You may qualify for a step therapy exception if any of the following apply:
Prior Failure or Ineffectiveness
You've already tried the required medication(s) and:
- Failed to achieve 5% weight loss after adequate trial (typically 3+ months)
- Regained weight after initial success
- The medication was ineffective for your specific condition
Documentation needed: Pharmacy records, provider notes with dates/doses/outcomes
Medical Contraindication
The required medication cannot be safely used due to:
- Phentermine: Uncontrolled hypertension, cardiovascular disease, hyperthyroidism, glaucoma, pregnancy, history of drug abuse, MAOI use
- Orlistat: Chronic malabsorption syndrome, cholestasis
- Contrave: Seizure disorders, eating disorders (anorexia/bulimia), concurrent opioid use, severe hepatic impairment
- Qsymia: Pregnancy or planning pregnancy, glaucoma, hyperthyroidism
Documentation needed: Medical records confirming the contraindicated condition
Adverse Reaction or Intolerance
You experienced significant side effects that prevented continued use:
- Severe GI symptoms (orlistat)
- Cardiovascular effects—elevated heart rate or blood pressure (phentermine)
- Neurological symptoms—seizure, cognitive impairment (Qsymia)
- Psychiatric symptoms—depression, anxiety, suicidal ideation
Documentation needed: Provider notes documenting side effects and discontinuation reason
State Step Therapy Override Laws
Over 30 states have enacted step therapy override laws requiring insurers to grant exceptions when:[4]
- Required medication is contraindicated
- Patient has already failed or had adverse reaction to required medication
- Patient is stable on their current therapy
- Required medication is not in patient's best interest based on clinical evidence
Response timelines: 72 hours for regular requests, 24 hours for urgent cases
Strong protection states: California, New York, Texas, Illinois, Michigan, Ohio
Clinical Evidence Supports Zepbound Specifically
In some cases, clinical evidence may support bypassing step therapy:
- Zepbound's 15-21% weight loss significantly exceeds older medications (3-10%)[9]
- Patient has comorbidities (OSA, cardiovascular disease, T2D) where greater weight loss provides additional benefit
- Patient's BMI is significantly elevated, requiring more effective intervention
Documentation needed: Provider rationale explaining why Zepbound is uniquely appropriate
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FIGHTING BACK
How to Appeal a Step Therapy Denial
Step therapy denials can be appealed by documenting prior medication trials, contraindications, or adverse reactions. You have 180 days from your denial date to file (check your denial letter).
Get Your Denial in Writing
Request written denial letter stating exactly which medications you must try first and for how long. Note your appeal deadline (typically 180 days).
Review Your Medication History
Check pharmacy records for prior weight loss medication trials. Note any side effects, contraindications, or ineffectiveness.
Identify Your Exception Argument
Choose your basis for appeal: prior failure, contraindication, adverse reaction, or state law protection.
Gather Documentation
Collect records of prior medication trials, side effect documentation, labs showing contraindications, BMI history, and comorbidities.
Submit Your Appeal
Work with your doctor to submit step therapy exception request, Letter of Medical Necessity, and supporting documentation via fax or certified mail.
Escalate If Denied
Request external review within 4 months. Independent reviewer decision is binding on insurer. 65%+ of appeals succeed with proper documentation.[8]
For the complete appeal process, see our Zepbound Appeals Guide.
TEMPLATE FOR STEP THERAPY APPEALS
Sample Appeal Language
Customize for Your Situation
Use the language below as a starting point. Your appeal will be strongest when tailored to your specific history and circumstances.
View Step Therapy Appeal Template
HEADER:
[Date]
[Medical Director Name]
[Insurance Company]
[Address]
Re: Step Therapy Exception Request for [Patient Name]
Member ID: [Number]
DOB: [Date]
Case/Reference ID: [Number]
OPENING:
"Dear Medical Director,
I am writing to request a step therapy exception for Zepbound (tirzepatide) for [Patient Name]. The prior authorization was denied due to step therapy requirements. I respectfully request reconsideration based on the following clinical information demonstrating why step therapy should be waived."
EXCEPTION REASON (choose applicable):
If Prior Failure:
"[Patient Name] has previously tried [medication name] from [start date] to [end date] at [dose]. Despite adequate trial duration, the patient achieved only [X]% weight loss, below the clinically meaningful threshold of 5%. The medication was discontinued due to [inefficacy/side effects]. Documentation attached."
If Contraindication:
"[Patient Name] has a documented history of [condition], which is a contraindication to [required medication]. Specifically, [explain why the required medication cannot be safely used]. Per [guideline/prescribing information], [required medication] should not be used in patients with [condition]."
If Adverse Reaction:
"[Patient Name] previously tried [medication name] and experienced [specific adverse effects], which required discontinuation. These effects persisted despite dose adjustment and were intolerable for the patient. Given this documented intolerance, requiring a repeat trial would not be medically appropriate."
If State Law Applies:
"Pursuant to [State] step therapy override law [cite statute], [Patient Name] qualifies for a step therapy exception because [state specific qualifying reason]. This law requires the insurer to grant an exception within [72 hours/24 hours for urgent cases]."
CLINICAL JUSTIFICATION:
"Zepbound (tirzepatide) is uniquely appropriate for [Patient Name] because:
• BMI of [X] kg/m² with comorbidities including [list with ICD-10 codes]
• Clinical trials demonstrate 15-21% weight loss with Zepbound vs. 3-10% with older medications
• The SUMMIT trial showed 38% reduction in cardiovascular events
• Patient's [comorbidities/clinical situation] warrants more effective intervention"
CLOSING:
"Based on the above, requiring [Patient Name] to trial additional medications before Zepbound would delay necessary treatment for a serious chronic disease and is not supported by clinical evidence or applicable state law.
Please contact me at [phone] with any questions. I request an expedited response due to the patient's clinical need.
Sincerely,
[Provider Name, Credentials]
[NPI Number]"
Key Phrases for Step Therapy Appeals
| Situation | Effective Language |
|---|---|
| Prior medication failed | "Patient achieved only [X]% weight loss after [X] months of therapy, failing to meet the clinically meaningful threshold of 5%." |
| Side effects | "Patient experienced [specific effects] requiring discontinuation. A repeat trial would expose patient to known intolerable effects without reasonable expectation of benefit." |
| Contraindication | "Per FDA labeling, [medication] is contraindicated in patients with [condition]. Patient has documented [condition], making this medication medically inappropriate." |
| Clinical urgency | "Delay in effective treatment poses significant health risks given patient's BMI of [X] and comorbidities including [conditions]. Expedited review requested." |
Official resource: Download Lilly's Letter of Medical Necessity template as a starting point.[10]
IF YOU'VE TRIED THE DRUGS
Documenting Step Therapy Failure
If you've tried the required medications and they didn't work (or you couldn't tolerate them), here's how to document it properly:
Documentation Checklist
Include the exact formulation and dosage you took
Show you took it for the required duration (or explain why you stopped early)
Document that you didn't achieve meaningful weight loss (typically <5%)
Be specific: "severe nausea daily" not just "GI issues"
Clearly state why: ineffective, intolerable, or both
Sample Documentation Language
For Inefficacy
"Patient completed 90-day trial of phentermine 37.5mg daily from [DATE] to [DATE]. Starting weight: 245 lbs (BMI 38.2). Weight after trial: 240 lbs (BMI 37.4). Patient achieved only 2% weight loss despite medication compliance and concurrent lifestyle modification, which is below the 5% threshold indicating adequate response."
For Intolerance
"Patient initiated Contrave on [DATE] and discontinued after 6 weeks due to severe, persistent nausea (daily vomiting), insomnia (sleeping <4 hours/night), and headaches unresponsive to supportive care. These adverse effects significantly impaired quality of life and made continued therapy intolerable."
WHAT'S CHANGING
Step Therapy: 2026 Outlook
2026: Step Therapy Requirements May Expand
More insurers are implementing step therapy for GLP-1 medications, often requiring trials of metformin, phentermine, or Saxenda before approving Zepbound. However, TrumpRx offers an alternative pathway.
TrumpRx: Skip Step Therapy Entirely
The federal TrumpRx program (TrumpRx.gov) lists Lilly's own self-pay prices; Zepbound (vials) orders go through LillyDirect at $299–$449/month—no step therapy, no prior authorization, no documentation. Launched February 5, 2026.[11]
Longer Step Therapy Trials Expected
Some insurers may extend required trials from 3 months to 6 months per medication. Wegovy trials may require up to 12 months before Zepbound approval.
State-Level Step Therapy Reform
Texas "Gold Carding": Providers with 90%+ approval rates bypass step therapy. California: Physicians can override step therapy with documented medical reason.
What Should You Do Now?
- Document all prior medications NOW: Any weight loss medications you've tried could satisfy 2026 requirements
- Start step therapy early if required: Completing it in 2025 means you're ready when policies change
- Consider TrumpRx as backup: At Lilly's self-pay prices ($299–$449/month) with no step therapy, this may be simpler than fighting stricter requirements
- Keep detailed records: Dates, doses, side effects, and weight outcomes for every medication tried
STEP THERAPY FOR ZEPBOUND
Frequently Asked Questions
Step therapy (also called "fail first") is an insurance requirement where you must try and fail on cheaper weight loss medications before your insurer will approve Zepbound. Common step therapy drugs include phentermine, Contrave, Qsymia, and increasingly Wegovy.
Most step therapy drugs require a 3-month trial. However, Wegovy (which many insurers now require) typically needs a 6-month trial. If you've already tried these medications in the past, you may be able to skip this waiting period by providing documentation.
Yes. If you've previously tried step therapy drugs (even years ago or with a different insurer), that may count. Gather records showing: which medication, dates of treatment, why you stopped, and weight outcomes. Your doctor can submit a step therapy exception request with this documentation.
Many step therapy drugs have contraindications. For example, phentermine is contraindicated if you have uncontrolled high blood pressure or heart disease. If a step therapy drug is unsafe for you, your doctor can document the contraindication and request an exception.
Over 30 states have step therapy override laws that require insurers to grant exceptions under certain conditions—such as contraindication, prior failure, adverse reaction, or when the patient is stable on current therapy. These laws typically require insurers to respond within 72 hours (24 hours for urgent cases).
No. Aetna is one of the more favorable insurers—they require only 6 months of documented lifestyle modification (diet and exercise), but no medication step therapy.
If you're currently taking Wegovy, you may have already satisfied step therapy requirements. Document how long you've been on it, your weight outcomes, and why switching to Zepbound is medically necessary (e.g., plateau in weight loss). Your doctor can include this in the PA request.
It depends on your insurer. Mounjaro and Zepbound contain the same active ingredient (tirzepatide), so prior Mounjaro use may satisfy step therapy requirements. Document your Mounjaro history—dates, doses, and outcomes—and have your doctor include this when requesting Zepbound.
You typically have 180 days from your denial date to file an internal appeal. If your internal appeal is denied, you can request an external review within 4 months. The external reviewer's decision is binding on your insurer.
YOUR PATH FORWARD
What's Next
Other Common Denial Reasons
Denied for a different reason? See our guides for other denial types:
- Medical Necessity Not Met — Insurer says treatment isn't needed
- BMI Criteria Not Met — Weight thresholds not satisfied
- Formulary Exclusion — Drug not on plan's covered list
- Missing Lifestyle Documentation — Diet/exercise records needed
Not sure why you were denied? View all Zepbound denial types →
References
- American Medical Association. (2023). "2022 AMA Prior Authorization Physician Survey." ama-assn.org (PDF)
- Massachusetts Group Insurance Commission. (2025). "CVS Caremark decides to remove Zepbound from CVS Caremark formulary." mass.gov
- Aetna. (2024). "Zepbound Prior Authorization with Limit." aetna.com
- Triage Cancer. (2025). "Health Insurance State Laws: Step Therapy." triagecancer.org
- UnitedHealthcare. (2025). "Zepbound Prior Authorization Criteria (OSA Indication)." uhcprovider.com (PDF)
- HealthCare.gov. "Internal Appeals." healthcare.gov
- GoodRx. (2025). "What is Step Therapy? How to Get Insurance to Pay for Your 'Non-Preferred' Drug." goodrx.com
- American Medical Association. (2024). "Over 80% of Prior Auth Appeals Succeed—Why Aren't There More?" 81% of MA appeals succeed; we use a conservative 65%+ estimate for commercial insurance. ama-assn.org
- Jastreboff AM, et al. (2022). "Tirzepatide Once Weekly for the Treatment of Obesity." N Engl J Med. SURMOUNT-1 trial. pubmed.ncbi.nlm.nih.gov
- Eli Lilly and Company. (2025). "Zepbound Letter of Medical Necessity Template." zepbound.lilly.com (PDF)
- STAT News. (November 6, 2025). "Trump announces deal with Lilly, Novo to expand access to weight loss drugs, cut prices." statnews.com
Last updated October 6, 2026
Disclaimer
The information on this page is for educational and informational purposes only and is not intended as medical advice. Honest Care does not provide medical diagnosis, treatment, or individualized recommendations. Always seek the advice of your physician or other qualified healthcare professional regarding any medical condition or treatment.
While this content has been reviewed for accuracy and balance, new evidence may emerge after publication. Drug availability, indications, and insurance coverage can change over time. Honest Care makes no warranties as to completeness or currentness of the information and is not responsible for decisions made based on this content.