Employer Health Plans and Generic Preferences: How Formularies Shape Your Prescription Costs

When you pick up a prescription at the pharmacy, you might not realize that the price you pay isn’t just about the drug itself-it’s shaped by a complex system your employer has signed up for. Most large employers offer prescription drug coverage, and nearly all of them use something called a formulary to decide which medications are covered and how much you’ll pay out of pocket. At the heart of this system is a clear, intentional preference: generic drugs.

Why Generics Are the Default Choice

Generic medications aren’t second-rate. The FDA confirms they contain the same active ingredients, work the same way, and are just as safe and effective as brand-name drugs. The big difference? Price. Generics typically cost 80-85% less than their brand-name equivalents. That’s not a guess-it’s backed by data. According to the Schauer Group, generic drugs save more than $3 billion every week in the U.S. That’s over $150 billion a year.

Employers don’t choose generics because they’re cheap for the sake of it. They choose them because they’re the most effective way to keep health plan costs under control. When a brand-name drug’s patent expires, a generic version enters the market. That’s when the system kicks in. Pharmacy Benefit Managers (PBMs)-the middlemen that manage drug coverage for most employer plans-automatically move the generic to the lowest cost tier. The brand-name version? It gets bumped up, often to the highest tier, where you pay significantly more.

How Formulary Tiers Work

Most employer plans use a tiered system to divide medications into cost categories. Here’s how it usually breaks down:

• Tier 1 (Generic): $10 copay. This is where most prescriptions start. If your drug has a generic version, this is the default.
• Tier 2 (Preferred Brand): $40 copay. These are brand-name drugs that the plan still covers, usually because there’s no generic yet or because they’re considered clinically better than other brands.
• Tier 3 (Non-Preferred Brand): $75 copay. These are brand-name drugs with available generics. If you choose the brand instead of the generic, you pay more.
• Tier 4 (Specialty): $200+ or coinsurance (e.g., 30% of cost). These are high-cost drugs for complex conditions like cancer, MS, or rheumatoid arthritis.

These numbers aren’t universal-they vary by plan-but the structure is. For example, in Ohio, the Department of Administrative Services uses this exact tier system for state employer plans. If you’re on a chronic condition like diabetes or high blood pressure, your drug is likely in Tier 1. If you’re on a newer brand-name drug with no generic, it might be in Tier 2. But if you insist on the brand when a generic is available? You’re moving up the ladder-and paying more.

Who Controls What’s Covered?

Behind the scenes, three companies control most employer prescription coverage: OptumRx, CVS Caremark, and Express Scripts. Together, they manage drug benefits for the majority of Americans with employer-sponsored insurance. These PBMs don’t just set tiers-they decide what stays on the formulary at all.

In January 2024, each of these three PBMs removed over 600 drugs from their formularies. That’s more than 1,800 medications gone in one move. Why? It’s negotiation. PBMs use exclusions as leverage. If a drugmaker won’t offer a big enough discount, the PBM drops the drug. That forces the manufacturer to either lower prices or risk losing access to millions of patients.

But here’s the catch: the savings from these negotiations don’t always reach you. PBMs use a pricing model called gross-to-net (GTN). That means a drug might have a list price of $100, but after rebates, discounts, and returns, the PBM nets only $45. The average GTN spread is 55%. That’s $55 of savings that never shows up on your copay receipt. The system saves money overall-but you might not see it.

What You Can Do

You don’t have to guess how your coverage works. Here’s how to take control:

• Check your insurer’s website. Look for your plan’s drug list. It’s often called a “formulary” or “drug list.”
• Review your Summary of Benefits and Coverage (SBC). It’s required by law and explains your copays and coverage rules.
• Ask your pharmacist. They know what’s covered and what’s cheaper. If your prescription is expensive, ask: “Is there a generic?”
• Call your insurer. If your drug was dropped from the formulary or moved to a higher tier, you can request a coverage exception. Your doctor can help with this.

Many employees are willing to use generics-they just don’t know they can. Employers who communicate clearly-through emails, payroll inserts, or even text messages-see higher generic use and lower overall drug spending. If your employer doesn’t explain this, ask them to. Knowledge is your best tool.

What Happens When Your Drug Disappears

It’s not rare for a medication to be removed from your plan’s formulary. Maybe the PBM cut a deal with a competitor. Maybe a generic just came out. Either way, you might show up at the pharmacy one day and find your drug isn’t covered anymore.

Don’t panic. You have options:

• Switch to the generic version (if available).
• Ask your doctor for an alternative drug that’s still on formulary.
• File a coverage exception. Your doctor can submit paperwork saying the drug is medically necessary. If approved, your plan will cover it-even if it’s off-formulary.

Some employers even offer care management programs. These programs assign a health coach who can help you find lower-cost alternatives, apply for patient assistance programs, or navigate appeals. If your plan offers this, use it.

The Bigger Picture

The system is designed to save money. And it works-on paper. Generics are cheaper. Formularies push people toward them. PBMs negotiate big discounts. But the gap between what’s saved and what you pay remains wide. The $150 billion saved annually doesn’t always translate to lower premiums or copays for you.

The future of employer drug coverage will likely see more exclusions, more tiered structures, and more pressure on manufacturers. But the goal stays the same: get you on the cheapest effective drug possible. And that drug? It’s almost always the generic.

So next time you’re handed a prescription, ask: Is there a generic? And if the answer is yes-you’re not just saving money. You’re using the system the way it was designed to work.