Moral Hazard in Health Insurance

Moral hazard in health insurance occurs when insurance protection changes behaviour because the insured person no longer bears the full financial consequences of healthcare decisions. More precisely, insurance can increase the use or cost of healthcare because patients pay only part of the bill, while insurers cannot fully observe or control whether each service is necessary.

How insurance changes incentives

Insurance pools financial risk and protects people against potentially large medical expenses. However, by lowering the out-of-pocket price paid when care is used, it can also encourage additional consumption.

• With third-party payment, the patient receives treatment, the provider supplies it, and the insurer pays some or all of the covered cost.
• Patients may agree to additional consultations, tests or treatments whose expected benefit is small relative to their total cost because they bear only a fraction of that cost.
• Information asymmetry makes control difficult: insurers cannot perfectly assess patients' needs, treatment decisions or the medical necessity of every claim.
• Greater use after obtaining insurance is not automatically wasteful; it may represent necessary care that was previously unaffordable.

Patient behaviour and provider incentives

Moral hazard can affect both preventive behaviour and decisions made after illness occurs. Provider incentives can amplify its effects because patients often rely on clinicians to judge what treatment they need.

• Ex ante moral hazard refers to reduced precautions or preventive effort before illness because insurance cushions its financial consequences; this effect is limited by the pain and other non-financial costs of illness.
• Ex post moral hazard refers to increased use or expense of care after illness occurs because insurance reduces the patient's direct payment.
• Fee-for-service payment rewards providers for additional services and can encourage more tests, procedures or visits, especially when patients face little direct cost.
• Moral hazard differs from adverse selection, which arises when people with different underlying risks have different incentives to obtain insurance; moral hazard concerns behavioural changes associated with coverage.

Managing moral hazard without restricting necessary care

The objective is to discourage low-value care while preserving financial protection and access to effective treatment.

• Deductibles, copayments and coinsurance make patients bear part of the cost, but can also discourage necessary care, particularly among poorer patients.
• Clinical guidelines and utilisation review help insurers assess whether proposed or completed treatment is appropriate.
• Provider-payment arrangements that do not reward every additional service can reduce overtreatment incentives, but require safeguards against undertreatment.
• Effective regulation should assess quality and necessity rather than assume that every increase in insured healthcare use reflects abuse.