How do surprise medical bills impact employer healthcare costs?

Surprise medical bills are not just a headache for employees; they are a direct drain on employer healthcare budgets. Before the No Surprises Act, a Kaiser Family Foundation analysis of 2017 claims found that about 18 percent of emergency visits and 16 percent of in-network hospital stays generated at least one out-of-network bill. When a patient unknowingly receives out-of-network care during an emergency or at an in-network facility, the resulting balance bills can cascade through a plan’s claims experience, inflate stop-loss premiums, and create hidden administrative burdens. For self-funded employers, these costs hit the bottom line with little warning, while fully insured groups see premiums rise as carriers price in the volatility. Understanding the full scope of this impact is essential for HR and benefits leaders who want to protect both their workforce and their financial strategy.

The Direct Financial Toll on Employer Plans

For self-funded health plans, every dollar paid on a surprise medical bill is a dollar that leaves the plan’s trust or corporate coffers. Unlike in-network care, where negotiated discounts keep costs predictable, out-of-network balance bills often reflect full billed charges. One study of emergency care claims found out-of-network physicians charging an average of 637 percent of the Medicare rate for the same services. These inflated claims drive up overall plan spending in several ways:

• Higher claim costs: Even when a plan applies its usual out-of-network coinsurance and reasonable-and-customary (R&C) reimbursement, the remaining balance that employees are billed still creates friction. If employers step in to cover these charges to prevent employee distress, either formally through plan amendments or informally through appeals, they directly absorb the differential.
• Stop-loss attachment point erosion: Self-funded plans that purchase stop-loss insurance rely on predictable aggregate claims. A cluster of surprise bills, particularly from high-cost emergency transports or surgical assists, can push annual spend closer to or over the attachment point. This leads to higher stop-loss renewal rates and sometimes a shift to a higher attachment point, increasing fixed costs.
• Fully insured premium inflation: In fully insured arrangements, carriers bake the cost of surprise billing into the renewal rate projection. The inherent unpredictability of out-of-network emergency and ancillary services forces insurers to add a risk margin, which employers pay through higher premiums over time.

The No Surprises Act: A Double-Edged Sword

The federal No Surprises Act (NSA), effective in 2022, removed many consumer balance bills by holding patients harmless and creating an independent dispute resolution (IDR) process between providers and payers. While this buffers employees from financial shock, it shifts the cost debate squarely onto employers and their insurer partners. The IDR process has repeatedly produced payments above the qualifying payment amount (QPA). Arbiters weigh the QPA alongside factors such as provider training, market share, and case complexity. In 2024, providers prevailed in about 85 percent of disputes, and prevailing offers typically came in at three to four times the QPA. This has led to rising plan costs for several reasons:

• Higher out-of-network allowed amounts: Instead of settling for R&C rates, plans now frequently pay IDR-determined rates that trend higher than what in-network contracts would have paid for the same service.
• Administrative and legal burden: The IDR portal requires exhaustive documentation, and plan fiduciaries must ensure their third-party administrators (TPAs) rigorously defend claims. TPA fees and internal legal review add to the cost of every dispute a plan contests.
• Gaps in protections: The NSA does not cover ground ambulance services or non-emergency out-of-network care that doesn’t occur at an in-network facility. These remaining surprise bills continue to land on employees, and employers often hear about it. The resulting goodwill adjustments or exception processes still cost the plan.

IDR Volume, Fees, and Backlog

The scale of the dispute process has outpaced every early estimate. Disputing parties submitted more than 5.1 million IDR disputes through January 2026, and providers alone initiated 2.6 million in 2025, up 77 percent from the year before. That volume carries a price. Certified arbitrators charged $425 to $800 for a single dispute in 2026, and up to $1,125 for a batched dispute of up to 25 items. One analysis puts total costs tied to the federal IDR process at more than $22 billion over four years. Even after the federal administrative fee dropped to $15 per party in 2026, arbitrator fees and the case load mean self-funded employers are funding a costly arbitration channel on top of the bills themselves. A backlog of roughly 430,000 disputes remained open as of mid-2025, leaving plans and providers uncertain about what they ultimately owe.

Hidden Costs: Administration, Compliance, and Employee Well-Being

Beyond the dollars that show up on a claims report, surprise medical bills generate a web of indirect costs that are easy to overlook but erode an employer’s benefits strategy:

• HR and benefits team bandwidth: Each surprise bill triggers a chain of calls, emails, and vendor coordination. HR teams may spend hours helping an employee navigate an appeal, contact the provider, or file a complaint. This diverts resources from strategic initiatives and can lead to a less-satisfied workforce.
• ERISA fiduciary risk: Employers that sponsor health plans have a fiduciary duty to act prudently and solely in the interest of participants. Ignoring systemic surprise billing issues-or failing to negotiate strong IDR safeguards-could expose the plan to allegations of mismanagement. In a worst case, this creates litigation risk or Department of Labor scrutiny.
• Employee health and productivity: Financial toxicity from surprise bills causes stress, delays in needed care, and reduced focus at work. When employees avoid preventive or chronic care visits out of fear of hidden costs, long-term health conditions escalate, ultimately driving higher medical and disability claims for the employer.

Strategic Approaches for Employers

Mitigating the impact of surprise medical bills is no longer optional; it’s a key component of a modern cost-containment and employee experience strategy. Here are the levers benefits leaders can pull:

1. Aggressive network design and plan language: Self-funded plans can amend their plan documents to define what constitutes a “prudent layperson” emergency, explicitly eliminate balance billing for NSA-covered services, and adopt a reimbursement benchmark that references a percentage of Medicare or a recognized fee schedule rather than leaving it to IDR alone.
2. Proactive TPA and carrier accountability: Require your partners to report on IDR outcomes, win rates, and average payment ratios. Build performance guarantees around surprise bill dispute resolution and member support. The goal is to ensure your plan isn’t a passive payer but an active negotiator.
3. Direct contracting with high-impact provider groups: For specialties that frequently generate surprise bills (such as emergency physician groups, anesthesiologists, and radiologists), some employers pursue direct contracts or wraparound network arrangements to bring those services in-network at a predictable rate.
4. Employee education and navigation tools: Help employees understand the NSA protections, how to read an Explanation of Benefits, and what to do if they receive a balance bill. Integrate digital cost estimators and advocacy services that intercept surprise bills early, before they turn into a crisis, reducing both plan costs and employee angst.
5. Advocacy and policy engagement: Join industry coalitions pushing for expanded NSA coverage, especially for ground ambulances, and for a more balanced IDR process that gives greater weight to the QPA. Collective employer voice can shape regulations to better protect plan costs.

Surprise medical bills are no longer a rare outlier; they are a structural feature of today’s fragmented care system. For employers, the impact ripples through claims experience, administrative load, and workforce well-being. A coordinated approach combining plan design, vendor accountability, and employee support turns this challenge from an unavoidable cost leak into a manageable strategic priority.