Essentials of the U.S. Health Care System

The fifth edition of this textbook, written by Leiyu Shi and Douglas A. Singh, provides a systematic overview of how health care is organized, financed, and delivered in the United States. The authors use a systems framework to argue that the U.S. health care system is uniquely complex, fragmented, and costly, lacking the universal coverage found in nearly all other developed nations. The book traces the system's historical roots, examines its current structure and workforce, and assesses its outcomes in terms of cost, access, and quality.

The authors establish that the U.S. health care system is not a single, centrally governed entity but a patchwork of loosely coordinated subsystems. Managed care, delivered through organizations such as health maintenance organizations (HMOs) and preferred provider organizations (PPOs), serves as the dominant mechanism, integrating financing, insurance, delivery, and payment. Other subsystems serve specific populations: The military system covers active-duty personnel, the Department of Veterans Affairs serves retired veterans, and safety net providers, including community health centers and hospital emergency departments, address the needs of people who lack adequate insurance. Medicare covers older adults, people with disabilities, and those with end-stage renal disease, while Medicaid covers low-income adults and children. The Children's Health Insurance Program (CHIP) extends coverage to children in families with modest incomes. The Affordable Care Act (ACA), enacted in 2010, expanded Medicaid in participating states, subsidized insurance through government-run exchanges, and required preventive services without cost sharing. By 2016, the number of uninsured Americans fell from 41 million to 27 million, though Republican efforts to repeal the law in 2017 were unsuccessful.

Ten distinguishing characteristics separate the U.S. system from those of other developed nations. There is no central governing agency, and financing is split roughly 55% private and 45% public. The system is technology driven and focused on acute care rather than prevention. The U.S. spends more on health care than any other country, 17.9% of gross domestic product (GDP) in 2016, yet access remains unequal, with racial disparities in life expectancy and child death rates exceeding those of many peer nations. Health care operates under imperfect market conditions: Insurance insulates consumers from true costs, a phenomenon called moral hazard, and providers can generate demand for services. Market justice, which distributes health care according to ability to pay, coexists in tension with social justice, which views health care as a collective right. The authors compare the U.S. with Canada's tax-financed system, Germany's socialized health insurance model, and the United Kingdom's National Health Service, noting that the U.S. has the highest spending, highest infant mortality, and lower life expectancy for women among the four countries.

The book defines health through competing models. The dominant biomedical model treats health as the absence of disease, while the World Health Organization's broader definition encompasses physical, mental, and social well-being. Four categories of determinants shape health outcomes: environment, behavior, heredity, and medical care. Since 1979, the U.S. has pursued Healthy People initiatives, setting 10-year national health objectives. Healthy People 2030, under development at the time of writing, addresses the nation's continued lag behind peer countries in life expectancy, infant mortality, and obesity.

A historical overview traces four eras of U.S. health care. In preindustrial America, from the mid-18th to late 19th century, medical education was unscientific and anyone could practice medicine. The postindustrial era brought scientific discoveries, educational reform through the 1910 Flexner Report (which exposed widespread inadequacies in medical schools and led to closure of substandard institutions), and the American Medical Association's (AMA) consolidation of physician authority. Private health insurance emerged during the Great Depression and became employer-based during World War II due to wage freezes and tax incentives. National health insurance repeatedly failed because of American individualism, AMA opposition, and resistance to higher taxes. Medicare and Medicaid were created in 1965 under President Lyndon Johnson, and federal health expenditures grew at an average annual rate of 30% between 1965 and 1970. The corporate era, beginning around 1970, brought managed care dominance, integrated delivery systems, and globalization. The ACA, passed without a single Republican vote, survived a 2012 Supreme Court challenge but was partially undermined when the Tax Cuts and Jobs Act of 2017 repealed the individual mandate requiring Americans to carry health insurance.

The workforce chapter notes that health care is the nation's largest employment sector. A significant imbalance exists between generalists (38% of physicians) and specialists (62%), and geographic maldistribution concentrates physicians in metropolitan areas, leaving rural and inner-city communities with shortages. Nonphysician practitioners, such as nurse practitioners and physician assistants, improve access in underserved areas but face legal and reimbursement barriers.

Medical technology brings enormous benefits but is the single most important factor in medical cost inflation. The Food and Drug Administration regulates drugs, devices, and biologics, while health technology assessment evaluates efficacy, safety, and cost-effectiveness. Unlike European countries with centralized assessment agencies, the U.S. relies primarily on the private sector for this function.

The financing section explains how insurance transfers risk through pooling, with cost-sharing mechanisms reducing moral hazard. Medicare's four-part structure covers hospital care (Part A), physician services (Part B), managed care options (Part C), and prescription drugs (Part D). Reimbursement has shifted from retrospective cost-based methods to prospective systems such as diagnosis-related groups (DRGs), in which hospitals receive predetermined rates based on diagnosis rather than actual costs incurred. Payment reform is moving toward value-based models linking reimbursement to quality.

The authors present primary care as the conceptual foundation of the delivery system. Evidence shows that areas with higher ratios of primary care physicians experience lower hospitalization rates, costs, and mortality. The patient-centered medical home model, in which a team guided by a primary care provider offers continuous and coordinated care, has gained widespread adoption. Community health centers serve approximately 25.9 million people, delivering quality care while reducing racial and ethnic health disparities. Hospitals evolved from charitable institutions to modern medical systems, expanding after the Hill-Burton Act of 1946 and Medicare's creation, then downsizing after the 1983 prospective payment system incentivized shorter stays and cost control.

Managed care grew from covering 27% of employer-insured workers in 1988 to 95% by 2002. Integrated delivery systems and accountable care organizations (ACOs) represent newer models; more than 560 ACOs formed, showing early cost savings. Long-term care encompasses a continuum of services for people with chronic conditions, with most care provided informally by unpaid family members. Nursing home utilization declined as community-based alternatives expanded.

Vulnerable populations, including racial and ethnic minorities, the uninsured, people experiencing homelessness, those with mental illness, and people living with HIV/AIDS, face compounding barriers to care. Strategies to reduce disparities include insurance expansion, community-based prevention, and the DHHS Action Plan to Reduce Racial and Ethnic Health Disparities.

The book evaluates cost, access, and quality as interrelated outcomes. U.S. spending reached $3.2 trillion in 2015, driven by factors including third-party payment, technology growth, the aging population, and administrative complexity. Quality improvement initiatives range from federal measurement programs to clinical practice guidelines and patient safety reporting systems.

Health policy in the U.S. is characterized by incremental reform, pluralistic interest group politics, and a decentralized role for states. The ACA represents the most ambitious coverage expansion since Medicare and Medicaid, though gaps remain for states that declined Medicaid expansion, undocumented immigrants, and individuals who find premiums unaffordable.

The authors conclude by examining the future. The aging population will strain Medicare, which faces insolvency within 10 to 15 years. National debt exceeded $20.5 trillion in January 2018, constraining future options. Care models are shifting toward value-based payments, population health management, and virtual care. Workforce shortages, global health threats, and emerging technologies such as gene therapy and personalized medicine will continue to reshape the system, even as the tension between innovation and cost containment persists.