The 2027 planning cycle will be a stress test for Affordable Care Act (ACA) insurers. A convergence of pressures including shifting risk pools, rule changes, policy volatility, and persistent cost inflation is challenging operations and margins alike.
And while there remains a legitimate concern of a significant exodus of enrollees due to the expiration of enhanced premium tax credits, there are two core issues facing insurers: the redistribution of membership and proposed Notice of Benefit and Payment Parameter (NBPP) rule changes. How insurers respond will shape not only their performance next year, but their long-term competitive position.
Success in this environment requires a deeper understanding of members. Why do they select a certain plan and metal tier, how do they interact with coverage, and what could cause them to leave? Carriers need a comprehensive view of enrollment redistribution and risk mix changes. Simultaneously, strategic carriers will take advantage of potential rule changes to prototype a greater variety of plans and coverage options outside of traditional marketplace structures.
Redistribution, more than contraction, is reshaping the market
ACA enrollment for 2026 fell by roughly 5% to 22 million, according to preliminary data from the Centers for Medicare and Medicaid Services (CMS). But the change was uneven with shifts in geographies, cohorts, and metal tiers. Enrollment in federally facilitated marketplaces — HealthCare.gov — dropped by nearly 8% compared with final 2025 enrollment, while state-based exchanges grew by 2%. Meanwhile, new consumer enrollment fell by 14%, compared with a 3% decline among returning members.
The variability is even more pronounced when looking at state-level data. Texas posted the largest absolute enrollment gain nationally, growing by roughly 5% year over year — or more than 200,000 plan selections — despite rising premiums and no state-level subsidy mitigation. By contrast, states like Florida, Georgia, and North Carolina, experienced double-digit percentage declines.
Many returning members found alternatives rather than exiting the market entirely. This points to redistribution, as the dominant force shaping Marketplace economics. Additionally, early indicators show that there may be continued contraction as members drop out of the exchange due to higher premiums. Both these effects require carriers to revisit profitability assumptions built for a more heavily subsidized and more stable risk environment.
Affordability is shifting metal-tier selection and risk mix Affordability influenced consumer choices for 2026, just not in the way many analysts expected. Policy uncertainty around enhanced premium tax credits led to predictions of a sharp decline in overall enrollment. Those predictions have yet to materialize. For the moment, affordability pressures showed up most clearly in plan selection and metal tier.
State-level data show that many consumers traded down from silver to bronze products to manage monthly premiums. In California, 37% of new enrollees selected a bronze plan in 2026, compared with 23% in 2025. Among returning members, 23% switched from silver to bronze, compared with 6% the prior year. Similar patterns are emerging elsewhere; in Maine, nearly 60% of consumers selected a bronze plan.
Together, these geographic and metal-tier shifts increase uncertainty in morbidity, pricing accuracy, and portfolio performance, making the 2027 planning cycle sensitive to small modeling errors and risk-mix assumptions.
Potential rule changes will drive greater volatility
The recently released draft 2027 NBPP proposes some significant changes to the Marketplace. The most interesting of these revolve around traditional Marketplace plan structures. Non-network plans and multi-year catastrophic plans for up to 10 years that would expand coverage options outside of traditional Marketplace structures. Additional changes would add greater plan variety and flexibility to plan design. Examples include potentially rolling back standardized plans and removal of limits on non-standardized plan offerings, potential bronze plans that can exceed the statutory maximum annual limitation on cost sharing, and removing of adult routine dental as an essential health benefit. All of these create a potentially more complex shopping experience.
Five actions insurers should take now
1. Stress-test economics where volatility actually manifests: Most pricing and portfolio decisions still rely on aggregate assumptions. That is no longer sufficient. Insurers must model economics at the level where risk is actually realized — assessing which federal poverty level (FPL) cohorts are moving across geographies, how premium sensitivity differs across FPL bands and metal tiers, where redistributed membership may diverge from historical morbidity assumptions, and how member-level shifts in risk affect unit economics and margin durability.
Relatively small changes in these factors can have an outsized impact on profitability in a redistribution-driven market. Carriers that continue planning at overly aggregated levels risk mispricing precisely where volatility is highest.
2. Be selective in pricing to build the right risk mix: Selective does not mean risk averse. Insurers with stronger capabilities in utilization management, medical management, and risk adjustment can profitably serve a broader range of cohorts at the right price point, provided pricing strategy aligns with their ability to manage that risk effectively.
Pricing should be used deliberately to target opportunistic geographies created by competitor exits or retrenchment, balance growth objectives with portfolio-level risk, and identify where capability gaps constrain profitable participation and should inform future investment priorities. The goal is not to bluntly avoid risk, but to capture the right risk mix at the right price.
3. Increase risk-adjustment rigor now: With redistributed membership and rising risk scores, 2026 should be treated as a risk-score volatility year. Insurers gaining new members face unknown morbidity, lagged risk-adjustment data, and a higher likelihood that pricing assumptions will diverge from realized experience.
Risk-adjustment rigor, including early review of claims experience, review of new members if they are in fact returning members, coding accuracy, provider documentation engagement, and internal predictability is becoming an increasingly important economic lever. Insurers that delay strengthening these disciplines risk compounding losses precisely when volatility is highest.
4. Proactively prototype non-standard plans and broader coverage options: First movers should test the market for consumer interest in broader plan and coverage options and employ a test-and-learn approach to observe consumer selection behaviors. Initial market tests offer real feedback and insight that carriers can use to recapture members lost due to affordability issues.
First movers also have the opportunity to innovate and gain a better understanding of how a broader range of products may meet what is an expanding consumer market. Beyond affordability options, carriers should test approaches that align with Individual Coverage Health Reimbursement Accounts (ICHRA) to capture expanding edges of the market.
5. Take a multi-year view of the Marketplace portfolio: Despite repeated questions about its viability, the ACA Marketplace has proven durable and continues to evolve. The policy conversation has shifted from whether the Marketplace should exist to how it should function. The 2027 NBPP’s proposal for catastrophic plans is a good example. Beyond extending coverage up to 10 years, these plans would carry deductibles exceeding $10,000 for an individual and $21,000 for families.
Regardless of which policies are finalized, insurers must manage Marketplace portfolios with the same rigor applied to larger lines of business. That includes investing in core performance capabilities to pinpoint where Marketplace economics can improve, building customer lifetime value discipline despite churn, strengthening consumer experience and transparency, and integrating Marketplace strategy with adjacent segments such as Individual Coverage Health Reimbursement Arrangements and the small-group commercial market.
Product innovation, precision in pricing, risk management, and portfolio strategy are more essential in a market that’s driven by redistribution and volatility. Insurers that invest with that discipline can generate outsized multi-year returns, while those that do not risk losing ground.