Health Insurance Consolidation: Rising Premiums & the Need for Regulation

Berlin – The cost of health insurance in the United States continues to be a major concern for individuals and families, and a growing body of evidence suggests that the increasing consolidation within the health insurance industry is a significant contributing factor. While the U.S. Relies heavily on private health insurance markets, these markets are becoming increasingly concentrated, raising questions about competition and affordability. This trend is impacting not only those with traditional commercial insurance but also those enrolled in Medicare Advantage and Medicaid plans.

The dynamics at play are complex, involving what experts call “asymmetric information” – where insurers have more information than consumers – and the market power that comes with consolidation. This combination, researchers argue, allows insurers to influence premiums, plan designs, and consumer welfare. The situation demands closer scrutiny and potential regulatory intervention to ensure a fair and accessible healthcare system.

Rising Consolidation and its Impact on Premiums

The trend toward consolidation in the health insurance market has been ongoing for decades, but has accelerated in recent years. This consolidation takes various forms, including mergers and acquisitions of insurance companies, as well as the growth of large, national insurers. According to data from the Kaiser Family Foundation (KFF), the largest private health insurance companies often operate across multiple markets, including Medicare Advantage, Medicaid managed care, individual, and fully-insured group health insurance. This multi-market presence gives them significant leverage.

The KFF report, published in February 2026, examined financial performance data through the complete of 2024, revealing that per enrollee gross margins were highest in the Medicare Advantage market. Simultaneously, medical loss ratios – the percentage of premium dollars spent on medical care – were lowest in the individual insurance market. This suggests that insurers are able to maintain higher profit margins in certain markets, potentially due to reduced competition. The Medicare Advantage market, with approximately 33 million people enrolled in 2024, is smaller than both the Medicaid managed care and fully insured group markets, but 1.4 times larger than the individual market.

The core issue is that when fewer companies control a larger share of the market, they have greater ability to dictate prices. This reduced competition can lead to higher premiums for consumers, fewer choices in plans, and potentially, limitations on access to care. The impact isn’t uniform; some markets are more concentrated than others, and the effects can vary depending on the specific characteristics of the local healthcare landscape.

The Role of Asymmetric Information and Adverse Selection

A key factor exacerbating the effects of consolidation is asymmetric information. Insurers possess detailed data about healthcare costs and utilization, while consumers often lack the same level of insight. This information imbalance allows insurers to design plans and set premiums in ways that maximize their profits, even if it means higher costs for consumers.

Related to this is the concept of “adverse selection.” This occurs when individuals with higher healthcare needs are more likely to enroll in insurance plans, while healthier individuals may opt out. If insurers cannot accurately assess risk and price plans accordingly, they may face financial losses. Consolidation can worsen adverse selection by reducing the diversity of plans available and limiting consumers’ ability to find coverage that meets their specific needs.

Medicare, Medicaid, and the Private Insurance Landscape

The increasing role of private insurers in public insurance programs like Medicare and Medicaid is a significant aspect of this trend. As of 2024, more than half of eligible Medicare beneficiaries are enrolled in private Medicare Advantage plans, and over three-quarters of Medicaid enrollees receive coverage through managed care plans, typically operated by private insurers. This shift towards privatization has implications for both the quality and cost of care.

For Medicare beneficiaries, enrollment in Medicare Advantage plans can offer benefits such as lower premiums and additional services. However, these plans often have narrower provider networks and require prior authorization for certain procedures, potentially limiting access to care. Medicaid managed care plans aim to improve efficiency and coordination of care, but concerns remain about potential cost-cutting measures that could compromise quality. The Centers for Medicare & Medicaid Services (CMS) notes that Medicare spending grew 7.8% to $1,118.0 billion in 2024, representing 21 percent of total national health expenditure. Medicaid spending grew 6.6% to $931.7 billion during the same period, accounting for 18 percent of total NHE.

Individuals who qualify for both Medicare and Medicaid – often referred to as “dually eligible” beneficiaries – are particularly vulnerable. These individuals often have complex health needs and rely on both programs for comprehensive coverage. Medicaid can aid cover costs that Original Medicare doesn’t, such as nursing home care and personal care services. States often pay Medicare Part B premiums for dually eligible individuals, and may also cover deductibles, coinsurance, and copayments.

National Health Expenditure Trends

Overall national health expenditure (NHE) in the United States reached $5.3 trillion in 2024, representing 18.0% of the Gross Domestic Product (GDP). This growth, at 7.2%, underscores the ongoing challenges of healthcare affordability. Private health insurance spending accounted for 31 percent of total NHE, reaching $1,644.6 billion in 2024. Hospital expenditures grew 8.9% to $1,634.7 billion, while physician and clinical services expenditures increased 8.1% to $1,109.7 billion. Prescription drug spending, while slower than in 2023, still increased by 7.9% to $467.0 billion. These figures highlight the broad-based increases in healthcare costs across all sectors.

Looking ahead, projections indicate that NHE growth will continue to outpace GDP growth over the next decade, further increasing the share of the economy devoted to healthcare. The insured share of the population is projected to remain high, at 92.1 percent in 2024, despite a projected decline in Medicaid enrollment.

The Need for Regulation and Antitrust Oversight

Given the evidence of increasing consolidation and its potential impact on premiums and consumer welfare, many experts are calling for greater regulatory scrutiny of the health insurance industry. This could include stricter antitrust enforcement to prevent mergers and acquisitions that would further concentrate market power, as well as measures to increase transparency and competition.

Potential regulatory approaches include requiring insurers to disclose more information about their pricing practices, limiting the utilize of restrictive network designs, and promoting the development of public insurance options. Addressing the issue of asymmetric information is also crucial, potentially through initiatives to empower consumers with better tools and resources to compare plans and understand their healthcare costs.

The debate over the appropriate level of regulation is ongoing, with insurers arguing that consolidation can lead to efficiencies and lower costs. However, the growing body of evidence suggests that the benefits of consolidation are often outweighed by the negative consequences for consumers.

Key Takeaways:

• Health insurance market consolidation is increasing in the U.S., impacting premiums and consumer choice.
• Asymmetric information and adverse selection exacerbate the effects of consolidation.
• The growing role of private insurers in Medicare and Medicaid raises concerns about access and quality of care.
• Increased regulatory scrutiny and antitrust oversight are needed to address the issue.

The future of healthcare affordability in the United States hinges on addressing the challenges posed by consolidation in the health insurance industry. Continued monitoring of market trends, coupled with proactive regulatory intervention, will be essential to ensure that all Americans have access to affordable, high-quality healthcare. The next key development to watch will be the release of updated financial performance data for 2025 by the National Association of Insurance Commissioners (NAIC) and compiled by Mark Farrah Associates, expected in early 2027.

What are your thoughts on the increasing consolidation of health insurers? Share your experiences and opinions in the comments below. Don’t forget to share this article with your network to raise awareness about this important issue.