What Is Reinsurance? (And Why It Sometimes Affects Claim Decisions)
Learn what reinsurance is, how it works behind the scenes in health and property insurance, and why reinsurance arrangements can sometimes influence how your claims are handled.
What Is Reinsurance?
Reinsurance is insurance purchased by insurance companies to protect themselves from large financial losses. When an insurer takes on policies and collects premiums, it faces the risk that claims — particularly very large or catastrophic claims — will exceed what it can comfortably pay. To manage this risk, the insurer purchases its own insurance from a reinsurer.
In simple terms: your insurance company has an insurance company.
Reinsurance does not directly involve individual policyholders. You have a contract with your primary insurer, not with the reinsurer. However, reinsurance structures can sometimes influence how an insurer handles high-value claims — a dynamic worth understanding.
How Does Reinsurance Work?
A primary insurer (called the cedent) transfers a portion of its risk to a reinsurer in exchange for a premium. In return, the reinsurer agrees to pay a share of certain claims if they exceed agreed thresholds.
Key reinsurance concepts:
Retention limit (retention level) The amount the primary insurer keeps for itself — the risk it does not pass on to a reinsurer. If a claim is below this threshold, the primary insurer pays entirely from its own funds.
Cession The portion of risk transferred to the reinsurer. The primary insurer "cedes" this risk in exchange for the reinsurance premium.
Reinsurance treaty A standing agreement between the primary insurer and reinsurer covering a broad class of policies over a period of time.
Facultative reinsurance Reinsurance purchased for a specific, individual risk — typically a very large or unusual exposure.
What Are the Types of Reinsurance?
Proportional (pro-rata) reinsurance The reinsurer shares a percentage of all premiums and all claims in a defined block of business. For example, the primary insurer keeps 70% of premiums and pays 70% of claims; the reinsurer receives 30% of premiums and pays 30% of claims.
Non-proportional (excess of loss) reinsurance The reinsurer only pays when losses exceed a specified threshold. For example, the primary insurer pays all claims up to $1 million per occurrence, and the reinsurer covers amounts above that. This is the most common structure for catastrophic protection.
Stop-loss reinsurance The reinsurer covers total losses that exceed a defined aggregate threshold for the entire portfolio over a policy period.
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Catastrophe reinsurance (cat re) Covers the primary insurer against losses from large-scale events affecting many policyholders at once — hurricanes, earthquakes, or (in health insurance) epidemics.
Does Reinsurance Affect How Your Insurance Company Handles Claims?
For most routine claims, reinsurance has no effect on your claim experience. The primary insurer handles your claim according to your policy terms, and reinsurance is an entirely back-end financial arrangement.
However, for very large or unusual claims, reinsurance can introduce some complexity:
High-value claims may trigger reinsurer involvement When a claim is large enough to involve the reinsurer's money, the reinsurer may have contractual rights to participate in or approve claim decisions. In some treaty structures, the reinsurer's claims examiners review large claims alongside the primary insurer.
Reinsurer scrutiny on catastrophic or complex claims In situations like a very expensive cancer treatment, a major surgery case, or a liability claim with large exposure, the reinsurer's risk appetite and claim-handling philosophy can indirectly influence the primary insurer's posture.
Stop-loss reinsurance in self-funded employer plans Many self-funded employer health plans (governed by ERISA) purchase stop-loss reinsurance to cap their per-employee or aggregate annual claims exposure. When an employee generates claims above the stop-loss attachment point, the stop-loss insurer becomes financially involved — and may contest whether claims are covered, potentially creating disputes about how the employer plan handles your claim.
Reinsurer solvency affects your insurer If a reinsurer becomes insolvent, the primary insurer absorbs the full loss — which can strain the primary insurer's finances and, in extreme cases, affect its claims-paying ability.
Is Reinsurance Regulated?
Yes, but differently from primary insurance. Reinsurance is regulated at the state level in the United States, primarily through the Reinsurance Regulatory Modernization Act framework and the NAIC's Credit for Reinsurance Model Law. Reinsurers must meet credit and solvency requirements but are generally subject to less consumer-facing regulation than primary insurers because they do not contract directly with individual policyholders.
The EU operates under Solvency II regulations, which apply comparable solvency and capital requirements to reinsurers operating in Europe.
What Should You Know About Reinsurance as a Policyholder?
As a consumer, the main things to understand are:
- Reinsurance does not change your rights: Your contract is with your primary insurer. The reinsurance arrangement does not alter your policy terms, claim rights, or appeal rights.
- Stop-loss reinsurance disputes in ERISA plans: If you have an employer self-funded plan and your employer is disputing coverage with its stop-loss insurer, this can indirectly delay or affect your claim. Your legal remedy remains against the plan (your employer), not the stop-loss insurer.
- Reinsurance is not your insurer's excuse: An insurer cannot deny your claim because its reinsurer will not cover it. The primary insurer is solely responsible for honoring your policy.
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