Do Health Benefits Cover Prescription Drugs? How the Formulary Works

Yes, most employer-sponsored health plans cover prescription drugs, but the details differ. Coverage structure and cost-sharing vary based on your plan design. The key is the formulary: the list that decides which drugs are covered and at what price. Your employees' out-of-pocket costs and your organization's health spend both hinge on understanding it.

How Prescription Drug Coverage Is Structured

Prescription drug benefits are typically integrated into a health plan in one of two ways:

• Embedded within a major medical plan (often called an "integrated" model) where medical and pharmacy benefits are administered under the same carrier or third-party administrator.
• A standalone Pharmacy Benefit Manager (PBM) that manages the drug list, rebates, and claim adjudication separate from the medical plan, though the two are typically coordinated.

Traditional BUCA (Blue Cross, UnitedHealthcare, Cigna, Aetna) plans almost always include pharmacy coverage. Self-funded employers often contract with a PBM to design a custom formulary aligned with their cost-containment goals. The key variable is the formulary tier system.

What Is a Formulary and How Does It Work?

A formulary is a dynamic, evidence-based list of prescription drugs covered by the health plan. It is developed by a Pharmacy & Therapeutics (P&T) committee composed of independent physicians, pharmacists, and other experts who evaluate drugs for safety, efficacy, and cost-effectiveness.

The Four Tiers of a Typical Formulary

Most commercial formularies categorize drugs into tiers, which determine the member's copay, coinsurance, or deductible responsibility:

1. Tier 1 (Preferred Generics): The lowest cost, lowest copay. These are generic equivalents of brand-name drugs and are the most cost-effective option for both the employer and the employee.
2. Tier 2 (Preferred Brands): Brand-name drugs that the P&T committee has selected for preferential coverage due to favorable pricing or clinical value. Copays are moderate.
3. Tier 3 (Non-Preferred Brands): Brand-name drugs not on the preferred list. These carry higher coinsurance or copays, often requiring prior authorization or step therapy.
4. Tier 4 (Specialty or High-Cost Drugs): This includes biologics, injectables, and oral oncology drugs. These are often subject to separate, higher deductibles or coinsurance percentages, and sometimes require specialty pharmacy distribution.

Some plans also include a Tier 0 (Preventive drugs) with $0 copay when obtained through a preventive care program, especially in modern ecosystems like WellthCare™ where preventive actions are incentivized. WellthCare, the first Health-to-Wealth Benefit System, works alongside existing health plans with zero disruption, lowering claims and costs while rewarding employees with store dollars and retirement contributions.

Key Formulary Management Tools Employers Should Know

To manage costs and ensure appropriate drug utilization, employers and PBMs use several tools:

• Prior Authorization: Requires a doctor's approval before the drug is covered. Used for high-cost or high-abuse drugs.
• Step Therapy: The patient must try a lower-cost, clinically equivalent drug first before "stepping up" to a more expensive alternative.
• Quantity Limits: Caps on how much of a drug can be dispensed in a given period (e.g., 30-day supply for controlled substances).
• Non-Formulary Exclusions: Some drugs are not covered at all unless medically necessary and proven to be irreplaceable.
• Brand vs. Generic Incentives: Many plans charge a lower copay for generics to encourage their use.

These tools can feel intrusive, but they keep costs in check.

How the Formulary Impacts Your Organization

Employers choose their formulary when designing their benefits package. A more restrictive formulary (fewer brand-name options) can lower premiums and pharmacy spend but may cause employee dissatisfaction if they cannot access familiar drugs. Conversely, an open formulary offers more choice but at higher cost. The right balance requires analyzing your population's drug utilization data.

For example, with WellthCare™, employers can integrate their pharmacy coverage with a transparent, aligned PBM model that eliminates spread pricing (a PBM charging the plan more than it pays the pharmacy and keeping the difference) and rebate opacity. This approach typically reduces drug costs by 20-40% compared to traditional PBMs, as described in the WellthCare Pharmacy™ offering. When employees use preventive care first (via WellthCare™), they reduce the need for high-cost drugs, lowering claims and improving formulary adherence.

GLP-1s and Specialty Drugs Are Reshaping Formularies

Drug mix is no longer a footnote. GLP-1 prescriptions reached 10.5% of pharmacy claims in employer plans in 2025, up from 6.9% in 2023, per the International Foundation of Employee Benefit Plans, and total GLP-1 spend rose roughly 50% in 2025 on higher utilization, according to Aon. Specialty drugs show the same shape: high price per prescription, fast-growing uptake. That's why tier placement matters. At renewal, the figure that counts is net cost after rebates. Watching drug mix and net cost per prescription is what turns a yearly formulary review into a cost-control lever. Employers who ask for that number, and for their own drug mix, can move coverage decisions from assumptions to their own claims data.

Best Practices for Employers

1. Review your formulary annually during renewal to ensure it reflects current medical evidence and provides cost-effective choices.
2. Educate employees on how to use the formulary. Most don't know that choosing Tier 1 generic drugs can save them hundreds of dollars per year.
3. Consider a transparent PBM model like WellthCare Pharmacy™ to align incentives and remove hidden fees.
4. Use wellness and preventive programs (such as WellthCare™) to improve health behaviors, which reduces prescription drug utilization over time and lowers overall costs.
5. Monitor drug mix trends (e.g., GLP-1s, specialty drugs) and adjust the formulary or plan design to manage emerging cost drivers.

Compliance Considerations

Prescription drug coverage and formularies are subject to federal regulations including ERISA, HIPAA (for privacy of pharmacy claims data), and the ACA (which requires coverage of certain preventive medications without cost-sharing). The ACA's Transparency in Coverage rules also require employers and insurers to publish machine-readable files of in-network rates, out-of-network allowed amounts, and prescription drug prices for public access. Ignore these requirements and you risk penalties.

WellthCare™ handles compliance-grade recordkeeping automatically, including tracking preventive care codes and reporting qualifying activity where applicable, so employers never have to guess whether their pharmaceutical benefits are compliant.

Health benefits do cover prescription drugs, but the formulary decides what is covered and at what cost. Employers who understand tiers, manage utilization, and choose an aligned pharmacy partner can lower pharmacy spend while keeping employees healthy and satisfied. To learn more about replacing your PBM with a transparent, integrated solution, explore WellthCare Pharmacy™.