For mid-market employers navigating the post-ACA benefits landscape, the binary choice between fully insured group coverage and traditional self-funding has quietly fractured into a spectrum of alternatives — each with distinct risk profiles, cost structures, and workforce implications. Two strategies drawing serious actuarial attention in 2025 and 2026 are level-funded health insurance and reference-based pricing (RBP). Both fit under the broad self-funded umbrella. Both can generate meaningful premium reductions versus conventional group coverage. But they operate through fundamentally different mechanisms, and choosing between them without an actuarial framework is the kind of decision that looks fine on a renewal date and surfaces as a workforce crisis six months later.

The distinction matters most for employers in the 30-to-200-employee range — companies large enough to generate meaningful claims data and small enough that a catastrophic claim, a surprise balance bill, or a mid-year network disruption can destabilize the entire benefit program. A Vermont employer recently presented with both options illustrates the tradeoffs precisely: level-funded PPO coverage at roughly $802 per employee per month with a traditional Aetna/Signal network versus reference-based pricing at approximately $737 per employee per month — the same $3,500 deductible and $7,500 out-of-pocket maximum, no contracted network, and Medicare-benchmarked reimbursement at 135–140%. The $65-per-month delta looks straightforward on a spreadsheet. The downstream risk profile is anything but.

This analysis builds an actuarial framework for evaluating that choice. It covers the mechanics of each funding model, cost comparison methodology, balance billing risk quantification, Vermont's June 2025 RBP legislation as a national market signal, workforce suitability factors, and a six-criteria decision rubric for plan sponsors and their advisors.

The Mechanics of Level-Funded Health Insurance

How the Funding Structure Works

Level-funded plans are a hybrid funding vehicle designed to give small and mid-market employers access to the cost advantages of self-insurance while preserving the budgeting predictability of a fully insured contract. The employer pays a fixed monthly amount — the "level" in level-funded — that is actuarially divided into three components: the expected claims fund (the self-insured layer), the stop-loss premium (specific and aggregate), and administrative fees covering the TPA or carrier's cost of claims adjudication, network access, and reporting.

The stop-loss architecture is what separates level-funded from pure self-insurance. Specific stop-loss engages when a single claimant's annual claims exceed a threshold — typically set between $20,000 and $50,000 for groups in the 25-to-100-employee range. Aggregate stop-loss caps total plan exposure as a percentage of expected annual claims, generally at 110–125% of the actuarially projected annual cost. According to SHRM's 2024 Employee Benefits Survey, approximately 42% of employers with 50–199 employees now use some form of partially or fully self-funded arrangement, up from 31% in 2018 — a trend driven largely by level-funded adoption among groups previously priced out of traditional stop-loss markets.

Surplus Return and the Claims Reconciliation Cycle

At policy year-end, the employer's claims fund is reconciled against actual paid claims. If claims come in below the funded level — a favorable outcome — the surplus is returned to the employer, typically 50–100% depending on contract terms. This feature converts what would otherwise be a pure insurance premium into a partially recoverable cost, giving actuarially healthy groups an effective net cost well below the headline monthly rate. KFF's 2024 Employer Health Benefits Survey documents average single-coverage premiums for employer-sponsored plans at $8,951 annually; level-funded programs for comparable groups with favorable claims experience routinely achieve net costs 8–15% below that figure after surplus return.

The contracted network — typically a major national or regional PPO such as Aetna, Cigna, UnitedHealthcare, or a regional Blue — is embedded in the level-funded structure. Employees access care through the same familiar network navigation they experience under fully insured coverage. Provider billing is adjudicated at contracted rates, and the plan-to-provider financial relationship is largely invisible to the employee.

The Mechanics of Reference-Based Pricing

Medicare Benchmarking as the Reimbursement Anchor

Reference-based pricing dispenses with contracted networks entirely. Instead of negotiating discounts off a provider's chargemaster rates — an approach that has become increasingly disconnected from actual cost — RBP plans reimburse providers at a defined percentage of the Medicare allowable rate for the same procedure and geography. The multiplier typically runs between 130% and 150% of Medicare, with 135–140% being the modal range in currently marketed programs. At that level, most hospitals and large provider groups are reimbursed at or above their documented cost of care, according to the American Hospital Association's 2023 Cost of Caring analysis — which estimated average hospital Medicare margins at approximately negative 8% before accounting for other payer mix.

The actuarial logic is straightforward: Medicare rates are publicly available, procedure-specific, and geographically adjusted. They represent a defensible, transparent cost benchmark uncorrelated with a provider's negotiating leverage. When the plan pays 135–140% of Medicare, it is paying above documented cost for most procedures — the dispute arises not from insufficient payment but from provider expectations anchored to chargemaster rates that may run 300–500% of Medicare for the same service.

Balance Billing: The Core Risk Factor

Balance billing occurs when a provider declines the RBP payment as payment in full and bills the patient for the difference between the plan's reimbursement and the provider's billed charge. This is the central operational risk in any RBP program. If a hospital bills $5,000 for a procedure, the plan pays $3,000 (reflecting the Medicare benchmark plus the applicable margin), and the provider sends the employee a $2,000 bill — that employee is experiencing a direct-to-wallet adverse event that a level-funded PPO member would never face for an in-network service.

Well-designed RBP programs address this through three mechanisms: (1) pre-service provider notification and coordination, which reduces billing disputes by establishing expectations before care is delivered; (2) balance billing resolution services staffed by legal and advocacy teams that engage providers directly to negotiate down or eliminate the balance; and (3) plan-level indemnification, in which the plan contractually agrees to hold the employee harmless from balance bills beyond their cost-sharing obligations. Employers evaluating RBP carriers should treat the presence of robust indemnification as a minimum threshold, not a premium feature.

Actuarial Cost Comparison: Why RBP Typically Prices $50–$120/Month Cheaper

The Source of the Savings

The cost differential between level-funded PPO coverage and reference-based pricing — typically $50–$120 per employee per month for comparable deductible and out-of-pocket structures — derives from two sources. First, RBP eliminates the network access fee embedded in level-funded premiums. PPO network licenses are not free: carriers charge plan sponsors for access to their contracted discount schedules, and that fee is built into the level-funded monthly rate. Second, RBP reimbursement rates, while above Medicare, are generally well below the contracted PPO rates that large hospital systems have negotiated with commercial insurers — particularly in concentrated regional markets where a dominant health system commands pricing power that no amount of PPO contracting discipline can fully neutralize.

Mercer's 2024 National Survey of Employer-Sponsored Health Plans found that employers using reference-based pricing reported average per-employee cost savings of 8–22% compared to their prior fully insured or level-funded arrangements, with savings concentration in inpatient hospital claims — the highest-cost category in most commercial books of business. Outpatient specialist and primary care savings were more modest, in the 5–12% range, reflecting that Medicare rates for these services are often not far below what major PPOs have already negotiated.

The Cost of Risk Transfer

The level-funded premium includes an implicit risk transfer cost: the employer is paying a carrier to absorb claims volatility above the stop-loss attachment point and to guarantee network access regardless of provider contracting disruptions. RBP programs offload that guarantee — the "network" is theoretically every provider who accepts Medicare patients (which is most providers), but the employer accepts the residual risk that a given provider will dispute the RBP payment and generate a balance billing event. Actuarially, the $65–$100/month per-employee savings in a typical RBP program represents the market price of that risk transfer — the question is whether the employer's specific workforce and administrative infrastructure can absorb it more efficiently than the carrier.

Balance Billing Risk: Frequency, Magnitude, and Mitigation

Quantifying the Exposure

Published data on balance billing frequency in RBP plans is limited — most carriers treat resolution rates as proprietary — but industry research suggests that balance billing disputes requiring active intervention occur in approximately 1–3% of total claims across RBP populations. The distribution is highly skewed: emergency and inpatient hospital claims generate the majority of disputes, while outpatient and professional services claims are rarely contested. A 2023 analysis published in Health Affairs found that among patients in self-funded plans without network protections, the median contested balance bill was $1,285, but the 90th percentile exceeded $7,400 — a magnitude that is materially adverse to employees in the $50,000–$80,000 income range.

For plan sponsors, the actuarial question is not whether balance billing will occur — it will — but whether the plan's resolution infrastructure converts that 1–3% dispute rate into a near-zero out-of-pocket impact for employees. Programs with dedicated advocate teams, binding indemnification language, and direct-to-provider legal resolution typically achieve resolution rates above 90%, with the residual balance absorbed by the plan rather than the member. Programs without these features transfer the residual to the employee, creating a hidden cost that does not appear in the per-employee monthly premium comparison.

Geographic Concentration Risk

Balance billing risk is not uniformly distributed. Markets with dominant health systems — where a single hospital network controls 60–80% of inpatient capacity — generate disproportionate dispute activity, because those systems face little competitive pressure to accept RBP payment levels. Vermont, with its single-payer adjacent hospital market structure and dominant academic medical centers, historically presented higher-than-average RBP dispute risk. The June 2025 RBP legislation addressed this directly by establishing a legislative framework for reference-based payment as a recognized funding alternative — a development discussed in the following section.

Vermont's June 2025 RBP Legislation: A National Market Signal

What the Legislation Established

Vermont's June 2025 reference-based pricing legislation is among the first state-level statutory frameworks to formally recognize RBP as a legitimate health plan funding alternative rather than a contractual workaround. The law established a 2-to-3-year statewide transition timeline, creating regulatory clarity for employers currently using or considering RBP by defining permissible reimbursement floor levels, mandating balance billing resolution procedures, and establishing a dispute mediation process through the state insurance commissioner's office. Vermont's progressive regulatory environment and history of healthcare reform make it a natural testing ground, but the legislation's structure — particularly the dispute resolution mandate — provides a template that other state legislatures are likely to adapt.

National Implications for Plan Sponsors

The Vermont legislation matters nationally for two reasons. First, it signals that the regulatory risk of RBP — the concern that a future administration or state legislature might prohibit the practice — is moving in the direction of codification rather than restriction. As more states follow Vermont's model, RBP programs will gain the kind of regulatory legitimacy that accelerates carrier investment in dispute resolution infrastructure and provider relationship management. Second, the transition mandate creates a real-world natural experiment: Vermont employers migrating from level-funded PPO coverage to RBP over 2025–2027 will generate claims and dispute data that actuaries and consultants nationally will use to refine cost and risk projections. For employers evaluating RBP today, Vermont's legislative framework reduces the "unknown regulatory risk" discount that a conservative plan sponsor would otherwise apply to any forward-year budget projection.

Workforce Suitability: Which Demographics Favor Each Model

Level-Funded Is Better Suited For…

Level-funded PPO coverage performs best in workforces where network familiarity is operationally important, financial resilience among employees is lower (making any balance billing event a potential HR crisis), and the plan administrator has limited capacity to manage claims disputes or employee advocacy calls. It is also the stronger choice when the employer's census includes a meaningful concentration of high-utilization claimants — chronic conditions, ongoing specialty care, or anticipated high-cost procedures — where the certainty of in-network contracted rates provides claims cost stability that the RBP reimbursement model may not guarantee. According to KFF, employer-sponsored plans covering workers in service industries with median household incomes below $60,000 saw out-of-pocket maximums create financial hardship in 19% of families with a major claim in 2023 — a finding that argues for minimizing any incremental billing uncertainty in lower-wage workforces.

RBP Is Better Suited For…

Reference-based pricing performs best in workforces that are geographically dispersed (reducing concentration risk in any single hospital market), have higher average incomes and financial resilience, and are served by HR or benefits administration teams with capacity to support employee navigation. It also performs well in industries where employees are accustomed to managing their own service provider relationships — professional services, technology, construction, and skilled trades — as opposed to industries with lower health literacy or higher administrative dependency. NAPEO's 2024 PEO industry benchmarking data suggests that groups in professional employer arrangements, which typically skew toward white-collar and skilled-trade workforces, experience RBP dispute rates approximately 35% below the national average, attributable partly to demographics and partly to the PEO's dedicated benefits administration infrastructure.

Decision Framework: Six Actuarial Criteria

A Systematic Rubric for Plan Sponsors

The following six criteria provide a structured framework for evaluating level-funded versus reference-based pricing. Each criterion should be scored independently; the aggregate pattern — not any single factor — should drive the decision.

1. Claims history and cost trajectory. Groups with two or more years of favorable claims experience and a low incidence of catastrophic claims are actuarially positioned to absorb the residual risk in an RBP program. Groups with volatile or deteriorating claims history benefit from the stop-loss certainty embedded in level-funded pricing.

2. Geographic hospital market concentration. Pull the CMS Hospital Compare data for your primary employee zip codes. If a single health system controls more than 60% of inpatient capacity in your primary market, that system's willingness to accept RBP payments — and the carrier's track record with that specific system — should be explicitly evaluated before committing to RBP.

3. Employee income distribution and financial resilience. If more than 30% of your workforce earns below $55,000, the expected cost of an unresolved balance billing event — even at low frequency — may create employee relations and retention costs that offset the per-employee premium savings. Level-funded's network protection carries a financial welfare value that does not appear in the headline rate comparison.

4. Benefits administration capacity. RBP programs generate more employee contact activity than level-funded PPO programs — pre-authorization coordination, explanation of benefits clarification, and occasional balance bill advocacy. If your HR team is already at capacity, the administrative cost of RBP support (whether internal or outsourced to a TPA) should be explicitly modeled against the per-employee savings.

5. Carrier RBP infrastructure quality. Not all RBP programs are equal. Evaluate the carrier's resolution service track record: what percentage of disputed claims are resolved without employee out-of-pocket impact? What is the median resolution timeline? Does the plan contractually indemnify the employee or merely "assist"? A program with 85% resolution rates and 90-day timelines transfers meaningfully more risk to employees than one with 97% resolution and 30-day timelines.

6. Three-year cost trajectory modeling. Per-employee premium comparisons are one-year snapshots. Level-funded rates typically trend at 8–12% annually for groups with stable or deteriorating claims. RBP programs, because they are anchored to Medicare rates adjusted by CMS annually, tend to trend more slowly — CMS rate adjustments have averaged 3–5% annually over the 2020–2025 period. A three-year present-value cost model that includes credible trend assumptions for each program often shows a larger total-cost advantage for RBP than the year-one per-employee delta suggests.

Using the Health Funding Cost Projector

The analysis above identifies the qualitative and structural factors in the level-funded versus RBP decision. Translating those factors into a defensible dollar-denominated recommendation requires modeling your group's specific census, claims history, geographic distribution, and benefit design against current carrier pricing. The Health Funding Cost Projector below is built for exactly this use case. It accepts employee count, average age, geographic concentration, current plan cost, and claims history inputs and generates side-by-side projections for level-funded, reference-based pricing, ICHRA, and traditional fully insured coverage — including a three-year total cost model and a risk-adjusted comparison that accounts for stop-loss attachment points, expected surplus return, and estimated balance billing resolution costs.

Frequently Asked Questions

Can a plan sponsor switch from level-funded to reference-based pricing mid-year, or is this a renewal-only decision?

In virtually all cases, the transition from level-funded to RBP is a renewal-only decision. Level-funded contracts are annual agreements with stop-loss carriers that cannot be unwound mid-term without triggering termination penalties and losing any accrued claims fund surplus. RBP programs similarly require full plan year adoption to establish benefit design documentation, Summary Plan Description language, and employee communication infrastructure. The practical implication: employers evaluating RBP should begin the analysis no later than 90–120 days before renewal to allow adequate time for carrier evaluation, census review, employee communication planning, and legal review of the plan document — particularly the balance billing indemnification provisions.

How does reference-based pricing interact with ACA requirements for minimum value and essential health benefits?

RBP plans for self-funded employers are not subject to the ACA's essential health benefit (EHB) mandates, which apply only to non-grandfathered individual and small group fully insured plans. However, self-funded plans covering 50 or more full-time equivalent employees are subject to the ACA's employer mandate, including the minimum value requirement — defined as covering at least 60% of the actuarial value of plan costs. RBP plans can satisfy minimum value provided the plan's benefit design (deductible, cost-sharing, and coverage scope) meets the threshold. Employers should request a minimum value certification from their actuary or TPA before plan year start, as carriers issuing employer mandate safe harbor Forms 1095-C will need documentation of minimum value compliance.

What happens when an employee requires emergency care at an out-of-area hospital that does not accept RBP payment?

Emergency care is the highest-risk scenario in any RBP program, because it cannot be pre-authorized or provider-coordinated. ERISA-governed self-funded plans generally cannot be limited by state balance billing laws (which are preempted by ERISA), but the No Surprises Act (effective January 2022) provides federal protections for out-of-network emergency care: it limits patient cost-sharing to in-network cost-sharing levels and establishes an independent dispute resolution (IDR) process for resolving payment disputes between plans and providers. For RBP programs, the No Surprises Act provides meaningful protection in emergency scenarios — the employee's out-of-pocket exposure is capped at the plan's applicable deductible and cost-sharing amounts, and any dispute over the plan's payment level is resolved through IDR rather than balance billed to the patient. Plan sponsors should confirm that their RBP carrier explicitly documents No Surprises Act compliance in emergency care protocols.

Is stop-loss coverage available for reference-based pricing programs, and does it work the same way as in level-funded plans?

Stop-loss coverage is available for RBP programs, but the structure differs from level-funded arrangements in one important respect: the stop-loss attachment point is typically set at a percentage of the RBP reimbursement schedule rather than a fixed dollar amount, and stop-loss carriers underwriting RBP programs will specify whether they will reimburse claims paid above the Medicare multiplier. Some stop-loss carriers require that all claims be adjudicated at a recognized fee schedule — a requirement that RBP programs satisfy. Employers should verify specific stop-loss attachment points, aggregating factors, and fee schedule recognition language before binding RBP stop-loss coverage, as terms vary meaningfully across carriers. Specific deductibles for RBP stop-loss programs typically run $25,000–$75,000 per member per year for groups in the 30-to-150-employee range.

How should employers communicate the switch to reference-based pricing to employees accustomed to traditional network coverage?

Employee communication is the most consistently underestimated implementation challenge in RBP transitions. Employees accustomed to showing an insurance card and receiving in-network care face a meaningfully different experience: they must be educated that most providers will accept the RBP payment, that disputes are handled by the plan's advocacy team, and that they will be held harmless from balance bills beyond their cost-sharing obligations. Best practice is a three-wave communication strategy: (1) a 60-day pre-enrollment announcement explaining the change in plain terms, with emphasis on savings and employee protections; (2) an enrollment-period reference guide with provider lookup tools and advocacy contact information; and (3) a post-enrollment 30-day check-in, including a live Q&A session with the TPA or RBP carrier. Employers who skip the communication investment routinely report 3-to-5 times the employee relations burden in year one compared to employers who conduct structured pre-enrollment education.

References

1. Kaiser Family Foundation (KFF). 2024 Employer Health Benefits Survey. San Francisco: KFF, 2024. https://www.kff.org/health-costs/report/2024-employer-health-benefits-survey/
2. Society for Human Resource Management (SHRM). 2024 Employee Benefits Survey. Alexandria, VA: SHRM, 2024. https://www.shrm.org/topics-tools/research/employee-benefits
3. Mercer. 2024 National Survey of Employer-Sponsored Health Plans. New York: Mercer LLC, 2024. https://www.mercer.com/en-us/solutions/health-and-benefits/research/national-survey-of-employer-sponsored-health-plans/
4. American Hospital Association. Costs of Caring: Key Factors Driving Growth of Hospital Costs. Chicago: AHA, 2023. https://www.aha.org/costsofcaring
5. Bureau of Labor Statistics (BLS). Employer Costs for Employee Compensation. Washington, DC: U.S. Department of Labor, 2024. https://www.bls.gov/ect/
6. National Association of Professional Employer Organizations (NAPEO). PEO Industry Survey: Health Benefit Benchmarking Data 2024. Alexandria, VA: NAPEO, 2024. https://www.napeo.org/research
7. Centers for Medicare and Medicaid Services (CMS). Medicare Physician Fee Schedule Final Rule 2025. Washington, DC: CMS, 2024. https://www.cms.gov/medicare/payment/fee-schedules/physician
8. Health Affairs. "Balance Billing and Out-of-Pocket Exposure in Self-Funded Plans Without Network Protections." Health Affairs 42, no. 8 (2023): 1102–1111. https://www.healthaffairs.org/
9. U.S. Departments of Labor, Health and Human Services, and Treasury. Requirements Related to Surprise Billing; Final Rules. Federal Register, 2022. https://www.federalregister.gov/documents/2022/08/26/2022-17040/
10. Vermont Department of Financial Regulation. Reference-Based Pricing Framework: Legislative Summary, 2025 Session. Montpelier, VT: State of Vermont, 2025. https://dfr.vermont.gov/