Health insurance in the United States started in 1798, when Congress created a payroll-funded medical program for merchant sailors. Modern private health insurance, the kind most Americans would recognize today, began in 1929 with a prepaid hospital plan for Dallas schoolteachers. Everything in between and after is the story of how those two ideas, a government program for a specific group and a prepaid plan sold to workers, grew into the employer-based and government-sponsored system covering most of the country now.
1798: The First Federal Health Program
On July 16, 1798, President John Adams signed the Act for the Relief of Sick and Disabled Seamen. It was the first federal law in the country to use payroll deductions to pay for medical care.1National Library of Medicine. Disease Control and Prevention: Health Care for Seamen
The law required the master or owner of every American vessel arriving from a foreign port to pay twenty cents per month for each sailor on board. Ship owners could withhold that amount directly from the sailors’ wages.2GovInfo. An Act for the Relief of Sick and Disabled Seamen The money funded hospitals and other facilities that treated sick or injured mariners.
The network that grew out of this law became the Marine Hospital Service, which was renamed the United States Public Health Service in 1912 and still exists today.1National Library of Medicine. Disease Control and Prevention: Health Care for Seamen It covered one occupation, not the general public, but the basic mechanism of regular small payments funding medical care was in place more than two centuries ago.
1929: The Baylor Plan and the Start of Modern Private Insurance
Modern private health insurance traces to a single plan in Dallas. In 1929, Justin Ford Kimball, a vice president at Baylor University, set up coverage for about 1,300 local public school teachers. Each teacher paid fifty cents a month and received up to twenty-one days of hospital care per year in return.
The arrangement worked for both sides. The hospital got predictable income during a period when many patients could not pay their bills, and teachers could budget a small recurring amount instead of facing an unpredictable one later. Hospitals around the country copied the model, and by 1939 the American Hospital Association had adopted the Blue Cross symbol as a national emblem for plans that met certain guidelines. The first Blue Shield plan, covering physician services rather than hospital stays, launched in California that same year. Together, Blue Cross and Blue Shield became the backbone of American private coverage for decades.
1940s: How Insurance Became Tied to Your Job
Health insurance became linked to employment during World War II, and the link was mostly an accident of tax and wage policy.
In October 1942, Congress passed the Stabilization Act, directing the President to hold wages and salaries close to their September 15, 1942, levels to curb wartime inflation.3Library of Congress. Stabilization Act of 1942, 50a USC 961-971 With cash raises largely blocked, employers competing for scarce workers started offering health benefits instead.
In 1943, the Internal Revenue Service ruled that employer contributions to group health insurance were exempt from taxation.4Congressional Budget Office. The Tax Treatment of Employment-Based Health Insurance Congress later codified the exclusion in Section 106 of the Internal Revenue Code, which keeps employer-provided accident and health coverage out of an employee’s gross income.5Office of the Law Revision Counsel. 26 US Code 106 – Contributions by Employer to Accident and Health Plans A dollar spent on coverage was worth more to a worker than a dollar of wages that would be taxed.
The effect on enrollment was dramatic. About 12 million Americans had private health insurance in 1940. By 1950, that figure had climbed to roughly 75 million, close to half the population, largely because of employer-sponsored plans.6MACPAC. Putting the Program in Context That is why most working Americans today still get coverage through their jobs.
1965: Medicare and Medicaid
Employer coverage did nothing for people who were retired, disabled, or too poor to buy a plan. On July 30, 1965, President Lyndon B. Johnson signed Public Law 89-97, the Social Security Act Amendments of 1965, creating two programs that changed the federal government’s role in healthcare.7Statutes at Large. Social Security Act Amendments of 1965
Title XVIII established Medicare, a hospital insurance program for people aged 65 and older who qualified for Social Security or Railroad Retirement benefits. The program was split into Part A for inpatient hospital services and related post-hospital care, and Part B for supplementary medical services such as physician visits. Medicare benefits took effect on July 1, 1966.8CDC. Medicare – Health, United States
Title XIX created Medicaid, a joint federal-state medical assistance program for people with limited income. It pulled together scattered federal aid programs for the aged, blind, disabled, and families with dependent children into a single framework, with federal matching funds for states that participated.9United States Senate Committee on Finance. The Social Security Amendments of 1965 – Brief Summary of Major Provisions Medicare and Medicaid together made the federal government a primary payer for medical services and set up the framework that still governs most public health spending.
Later Laws That Shaped Today’s Coverage
After 1965, Congress kept adding layers. Each one addressed a specific problem with how coverage worked, and together they produced the patchwork most people deal with today.
HMO Act of 1973
Rising costs pushed Congress to encourage alternatives to traditional fee-for-service insurance. The Health Maintenance Organization Act of 1973 made federal grants and loans available to new HMOs, which charged a fixed periodic payment for comprehensive care instead of billing for each visit. A 1976 amendment required employers with 25 or more workers to offer a federally qualified HMO alongside their regular plan when one was available locally, helping managed care spread through the market.
ERISA (1974)
The Employee Retirement Income Security Act set federal standards for employer-sponsored benefit plans, including health insurance, and it preempts state laws that relate to those plans.10Office of the Law Revision Counsel. 29 US Code 1144 – Other Laws That is why employers who self-insure fall largely outside state insurance regulation.
COBRA (1985)
The Consolidated Omnibus Budget Reconciliation Act of 1985 gave workers a way to keep coverage after losing it. If you leave a job or have your hours cut at a company with 20 or more employees, you can elect to continue your group health plan for up to 18 months, though you pay the full premium yourself.11Office of the Law Revision Counsel. 26 US Code 4980B – Failure to Satisfy Continuation Coverage Requirements of Group Health Plans Workers who become disabled during the first 60 days of COBRA coverage may qualify for an extension of up to 29 months total.
HIPAA (1996)
The Health Insurance Portability and Accountability Act addressed the fear that changing jobs meant losing coverage or facing new restrictions. HIPAA barred group health plans from discriminating based on health status and guaranteed special enrollment opportunities after certain life events, such as losing other coverage or gaining a dependent.12U.S. Department of Labor. Portability of Health Coverage It also placed the first meaningful federal limits on how long insurers could enforce pre-existing condition exclusions.
CHIP (1997)
The Balanced Budget Act of 1997 created the Children’s Health Insurance Program as Title XXI of the Social Security Act, giving states federal funds to cover uninsured children in families earning too much for Medicaid but too little for private coverage.13Office of the Law Revision Counsel. 42 USC Chapter 7, Subchapter XXI – State Childrens Health Insurance Program Eligibility runs from 170 percent to 400 percent of the federal poverty level depending on the state.14Medicaid.gov. CHIP Eligibility and Enrollment Coverage began on October 1, 1997.
Medicare Part D (2003)
For almost four decades, Medicare did not cover outpatient prescription drugs. The Medicare Prescription Drug, Improvement, and Modernization Act of 2003 added a voluntary prescription drug benefit, Part D, with coverage effective January 1, 2006.15GovInfo. Medicare Prescription Drug, Improvement, and Modernization Act of 2003
2010: The Affordable Care Act
The Patient Protection and Affordable Care Act, signed in March 2010, was the biggest change to the health insurance system since 1965. A few provisions matter most for understanding where coverage stands now.
Pre-existing conditions. Before the ACA, insurers could deny coverage or charge more based on medical history. Under 42 U.S.C. § 300gg-3, group health plans and insurers offering individual or group coverage cannot impose any pre-existing condition exclusion.16Office of the Law Revision Counsel. 42 US Code 300gg-3 – Prohibition of Preexisting Condition Exclusions or Other Discrimination Based on Health Status
The individual mandate. The ACA originally required most people to carry minimum essential coverage or pay a tax penalty. The Tax Cuts and Jobs Act of 2017 reduced that federal penalty to zero starting in 2019, removing the financial consequence at the federal level.17IRS. Questions and Answers on the Individual Shared Responsibility Provision Some states have enacted their own mandates with state-level penalties.
Marketplaces and premium tax credits. The law created online marketplaces where people without employer coverage can compare and buy plans, and it provided premium tax credits based on household income to make those plans affordable. Enhanced credits first introduced in 2021 and extended through 2025 by the Inflation Reduction Act expanded eligibility and lowered premiums for millions of enrollees. As of early 2026, those enhanced credits are set to expire, which would raise out-of-pocket premium costs for marketplace enrollees and end subsidies for people with incomes above 400 percent of the federal poverty level.
From a twenty-cent monthly deduction for eighteenth-century sailors to a federal marketplace serving millions, health insurance in the United States has been built in pieces across nearly 230 years. Each law responded to a specific pressure of its moment, and the result is the layered system, part private, part public, part employer, part individual, that Americans navigate today.