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📋 '''Health maintenance organisation''' (commonly abbreviated HMO) is a type of [[Definition:Managed care | managed care]] organization that provides or arranges comprehensive [[Definition:Health insurance | health insurance]] coverage through a defined network of physicians, hospitals, and other healthcare providers, typically requiring members to select a [[Definition:Primary care physician | primary care physician]] and obtain referrals before accessing specialist services. Originating in the United States — where the Health Maintenance Organization Act of 1973 spurred their proliferation — HMOs represent a distinctive model in which the insurer (or the organization itself, when vertically integrated) assumes both the [[Definition:Underwriting | underwriting]] risk and a significant degree of control over healthcare delivery and utilization. While the HMO model is most closely associated with the U.S. market, managed care principles it pioneered — gatekeeping, capitation-based provider payment, and utilization review — have influenced [[Definition:Health insurance | health insurance]] product design and cost-containment strategies in markets from Latin America to parts of Asia and Africa.

⚙️ An HMO contracts with or directly employs healthcare providers, paying them through [[Definition:Capitation | capitation]] (a fixed per-member, per-month amount) or negotiated fee schedules rather than open-ended fee-for-service reimbursement. This payment structure aligns provider incentives with cost control, since the provider bears financial risk if utilization exceeds expectations. Members pay [[Definition:Premium | premiums]] — often subsidized by employers under [[Definition:Group health insurance | group health]] arrangements — and typically face lower [[Definition:Cost-sharing | cost-sharing]] (copayments and coinsurance) than in [[Definition:Preferred provider organisation (PPO) | PPO]] or indemnity plans, but in exchange accept restrictions on provider choice. Services obtained outside the HMO network are generally not covered except in emergencies. From an insurer's perspective, the closed-network model enables tighter [[Definition:Claims management | claims management]], more predictable [[Definition:Medical loss ratio (MLR) | medical loss ratios]], and the ability to implement preventive care and disease management programs that reduce long-term [[Definition:Loss cost | loss costs]]. In the U.S., HMOs are subject to both state insurance regulation and, for certain products, federal oversight under the [[Definition:Affordable Care Act (ACA) | Affordable Care Act]], including minimum medical loss ratio requirements.

💡 HMOs reshaped the economics of health insurance in the United States by demonstrating that integrating insurance and care delivery could materially reduce costs — though not without controversy over access limitations and perceived constraints on physician autonomy. For the insurance industry globally, the HMO concept is significant because it represents one end of a spectrum between fully indemnity-based coverage and fully managed care, and many hybrid models (point-of-service plans, tiered networks) draw directly from HMO principles. Insurers operating in emerging markets, where healthcare cost inflation threatens the viability of traditional indemnity products, increasingly adopt managed care elements inspired by the HMO playbook — including provider network management, pre-authorization protocols, and outcomes-based payment arrangements. Understanding the HMO model is also essential for [[Definition:Reinsurer | reinsurers]] pricing excess-of-loss or stop-loss covers over managed care blocks, since the utilization patterns and [[Definition:Loss development | loss development]] characteristics of HMO business differ markedly from those of open-network plans.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Managed care]]
* [[Definition:Health insurance]]
* [[Definition:Preferred provider organisation (PPO)]]
* [[Definition:Capitation]]
* [[Definition:Medical loss ratio (MLR)]]
* [[Definition:Group health insurance]]
{{Div col end}}

Definition:Health maintenance organisation - Revision history

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