CVS Caremark and Express Scripts are the two largest pharmacy benefit managers in the United States. The one managing your drug benefit determines which medications are covered, which pharmacies you can use, and what you actually pay at the counter.
This guide compares both PBMs across formulary design, pharmacy networks, mail order, and rebate practices. Compare drug prices across both networks at RxDiff before filling any prescription.
A pharmacy benefit manager — or PBM — administers your prescription drug benefit on behalf of your health insurance plan or employer. PBMs negotiate drug prices with manufacturers, manage the formulary, process claims, and operate mail-order services. CVS Caremark and Express Scripts together manage drug benefits for over 200 million Americans. The third major competitor is OptumRx, owned by UnitedHealth Group.
Your The administrator is typically separate from your insurer. CVS Health owns CVS Caremark. Cigna/Evernorth owns Express Scripts. Both operate specialty pharmacy arms — CVS Specialty and Accredo respectively — for complex, high-cost treatments.
The main practical difference between Caremark and Express Scripts is retail integration. The benefit manager patients can fill 90-day maintenance supplies at CVS retail locations in addition to mail order. Express Scripts relies primarily on its mail-order network and partners with retail chains like Walgreens. For formulary design, both use active exclusion policies to drive lower-cost generics and preferred brands.
| Feature | CVS Caremark | Express Scripts |
|---|---|---|
| Parent company | CVS Health | Cigna / Evernorth |
| Retail integration | CVS stores | Walgreens, major chains |
| Mail-order service | Yes | Yes |
| Specialty pharmacy | CVS Specialty | Accredo |
| 3-month retail fills | Yes (CVS locations) | Limited |
Both This administrator and Express Scripts use drug list exclusion policies to control drug spending — removing brand-name drugs from coverage when lower-cost alternatives are available. When a brand is excluded, your plan will direct you to a covered alternative. You can request a coverage list exception if your prescriber documents why the excluded drug is medically necessary for your specific condition.
The covered drugs design differs between plans managed by the same administrator. What's covered on a Cigna plan using Express Scripts may differ from what's on an Aetna plan using It. Always check your specific plan's the plan's list — not just who the The benefit manager is — before assuming a drug is covered.
Its negotiate rebates from drug manufacturers in exchange for formulary placement. These the payments are supposed to reduce plan costs — but they often don't reduce patient copays at the point of sale. Federal and state legislation is increasingly requiring both Caremark and Express Scripts to disclose negotiated savings arrangements and ensure more value flows back to patients.
The FTC's 2024 The middleman report found that these funds practices by major administrators contribute to higher list prices and don't consistently reduce what patients pay at the counter.
Independent pharmacies have raised significant concerns about reimbursement rates from both administrators. Low reimbursement has contributed to pharmacy closures, particularly in rural areas. Several states have enacted legislation addressing how The administrators reimburse independent pharmacies and what network exclusion criteria they can use.
If you prefer an independent pharmacy, confirm it's in-network with your specific plan before filling. Use GoodRx, SingleCare, or RxDiff as cash-price alternatives when discount cards offer lower prices than your insurance copay.
Compare drug prices across both The benefit manager networks — free and instant on RxDiff.
Compare Drug Prices on RxDiff →What is the difference between The benefit manager and Express Scripts?
This administrator integrates with CVS retail locations for in-store 90-day fills and specialty services. Express Scripts operates primarily through mail order and retail partner networks without a proprietary store presence. Both manage formularies, negotiate manufacturer the discounts, and process claims for large employer and government health plans.
Which It offers better drug pricing?
Neither is uniformly better across all medications. Pricing depends on how each administrator has placed your specific drugs on its formulary and what the payments were negotiated. Compare prices using RxDiff before filling — discount card pricing sometimes beats The middleman negotiated rates for certain generics.
Can I use any pharmacy with It or Express Scripts?
Both operate large pharmacy networks but not every location is in-network on every plan. CVS Caremark plans typically offer strong access at CVS stores. Express Scripts plans include Walgreens, Kroger, and most major chains. Check your plan's pharmacy finder before filling at a new location.
What is formulary exclusion and how does it affect me?
A formulary exclusion means your The administrator removed a specific brand from coverage because a lower-cost alternative is available. If your drug is excluded, you'll be directed to a covered substitute. Your prescriber can request a formulary exception with clinical documentation if the excluded drug is medically necessary for your condition.
What is OptumRx?
OptumRx is the The benefit manager arm of UnitedHealth Group — the third major administrator alongside CVS Caremark and Express Scripts. Together, these three manage the vast majority of prescription drug benefits in the United States. All three offer formulary management, mail order, specialty pharmacy, and clinical programs.
Do It negotiated savingss lower what I pay at the pharmacy?
Not consistently. These fundss negotiated by The middlemans from manufacturers often don't reduce patient copays at the point of sale. The FTC's 2024 report found this is a significant issue. Federal and state transparency laws are increasing pressure on administrators to pass more the discount value through to patients.
Medical Disclaimer: This content is for informational purposes only. The administrator policies change frequently — always verify current coverage with your health plan. Use RxDiff to compare current drug prices in your area.