CVS Caremark and Express Scripts are pharmacy benefit managers (PBMs). They administer prescription benefits for health plans and employers, including formularies, claims processing, pharmacy networks, and mail-order services.
Use RxDiff to compare current cash prices for a prescription. RxDiff is free, needs no account or insurance, and is not a pharmacy or healthcare provider.
Your plan, not the PBM name alone, determines the formulary, copay, prior-authorization rules, and participating pharmacies. Two plans using the same PBM may have different coverage.
Caremark is associated with CVS Health, while Express Scripts is part of Evernorth. Both may offer retail, mail-order, and specialty services, but the available pharmacies and terms depend on the specific plan.
Check your plan's current drug list and pharmacy finder before filling a prescription. A discount offer can be compared with a cash price, but it is separate from insurance and generally does not count toward a deductible. PBM rebates and negotiated arrangements do not guarantee a lower point-of-sale cost for every patient.
Compare current cash prices by prescription and location.
Compare Prices on RxDiff →What is the difference between CVS Caremark and Express Scripts?
Both administer prescription benefits, but their networks, formularies, mail-order services, and plan terms differ. Your individual plan controls the details.
Which PBM offers better drug pricing?
Neither is uniformly better. Pricing depends on the plan, drug, pharmacy, and coverage rules. Compare the exact prescription and review your plan documents.
Can I use any pharmacy with either PBM?
No. Each plan has its own participating network. Use the plan's pharmacy finder or call member services before filling at a new location.
What is a formulary exclusion?
It means a plan does not cover a particular product under its usual benefit. Ask the plan and prescriber about covered options or an exception when appropriate.
Can RxDiff compare PBM prices?
RxDiff compares available cash-price options. It is free, requires no account or insurance, prices vary by location and prescription details, and it is not a pharmacy or healthcare provider.