The Health Maintenance Organization Act of 1973 was the first federal law to define and support HMOs, signed by President Richard Nixon on December 29, 1973 as Public Law 93-222.1The American Presidency Project. Statement on Signing the Health Maintenance Organization Act of 1973 It set qualification standards for prepaid health plans, funded their startup with federal grants and loan guarantees, cleared away state laws that had blocked them, and forced larger employers to offer a qualified HMO alongside traditional insurance. The Act’s goal was to move a share of American healthcare off the fee-for-service model, where providers earn more by doing more, and onto a model where a plan receives a fixed payment per member and takes responsibility for delivering the care that member needs.
What Federal Qualification Required
To become “federally qualified,” an HMO had to deliver a defined package of basic health services to every enrolled member without arbitrary limits on time or cost. The package included physician services from licensed doctors, inpatient and outpatient hospital care, emergency services inside and outside the plan’s service area, up to 20 outpatient mental health visits per member per year for short-term evaluation or crisis intervention, laboratory and radiologic diagnostics, and preventive care including immunizations and well-child care from birth.2eCFR. 42 CFR Part 417 Subpart B – Qualified Health Maintenance Organizations: Services
That list was a floor. A qualified HMO had to provide at least this level of coverage to every member, regardless of health history or prior claims. Plans could also offer supplemental benefits such as vision, dental, prescription drugs, extended mental health treatment, and long-term care, with members contracting for those separately.3Social Security Administration. Health Maintenance Organization Act of 1973
Community Rating and Open Enrollment
A qualified HMO could not price members based on individual health risk. Instead it had to use community rating, which the statute allowed in two forms. The simpler version charged equivalent rates to all individuals and to all families of similar size. The group-based version sorted members into categories using factors that predict differences in healthcare use, calculated the revenue needed to serve each group, and set rates accordingly. The Secretary of Health and Human Services reviewed the grouping factors and could reject any that didn’t reasonably predict utilization.4Office of the Law Revision Counsel. 42 USC 300e-1 – Definitions Either way, HMOs could not single out sick individuals for higher premiums, which was standard practice in the traditional insurance market at the time.
Qualification also required an annual open enrollment period. During that window, the HMO had to accept new members without waiting periods, health-status exclusions, or other restrictions designed to screen out people likely to need expensive care.5eCFR. 42 CFR 417.155 – How the HMO Option Must Be Included in the Health Benefits Plan This was a significant departure from how most insurers operated in the 1970s.
The Employer Dual Choice Mandate
The Act’s most aggressive tool was the dual choice mandate in Section 1310. Any employer that paid at least minimum wage and averaged 25 or more employees had to offer a federally qualified HMO as an alternative to its existing health plan, so long as a qualified HMO operated in the area where at least 25 of those employees lived.6GovInfo. Public Health Service Act – Title XIII – Health Maintenance Organizations The same rule applied to state and local governments meeting that threshold.
The obligation was triggered when a qualified HMO submitted a formal request to the employer. The employer then had to include the HMO option during the next group enrollment period, could not impose waiting periods or health-status exclusions on employees choosing it, and could not financially penalize workers who picked managed care over traditional insurance.5eCFR. 42 CFR 417.155 – How the HMO Option Must Be Included in the Health Benefits Plan
Employer contributions had to be nondiscriminatory, meaning the funding method could not steer employees away from the HMO choice. Federal rules laid out several acceptable approaches, including equal dollar amounts per employee, risk-adjusted contributions, a fixed percentage of each plan’s premium, or an arrangement negotiated directly with the HMO.7eCFR. 42 CFR 417.157 – Contributions for the HMO Alternative Employers were never required to spend more on health benefits than their existing contracts already obligated them to pay.
Employers that knowingly failed to comply faced a civil penalty of up to $10,000, with an additional $10,000 available for every 30-day period the violation continued. The Secretary of Health and Human Services set the amount by weighing the seriousness of the violation against the employer’s good-faith efforts to come into compliance. Penalties were collected through civil actions filed by the United States in federal district court.8Office of the Law Revision Counsel. 42 USC 300e-9 – Employees Health Benefits Plans
Federal Money to Launch New HMOs
Starting a prepaid health plan from scratch costs serious money, and Congress knew it. The Act authorized federal grants and contracts for three stages of HMO development: feasibility surveys to test whether a local market could sustain the model, planning projects to design the organization, and initial development to build provider networks and administrative operations. In total, the Act authorized $375 million over five years.3Social Security Administration. Health Maintenance Organization Act of 1973
A separate loan guarantee program helped nonprofit and for-profit HMOs secure private financing for clinics, offices, and the operating deficits that pile up during a plan’s early years. Borrowers could defer principal payments for the first 60 months of operation, paying only interest during that startup window.9GovInfo. 42 CFR 417.937 – Loan and Loan Guarantee Provisions Most new HMOs lost money for years while building enrollment, and without that breathing room many would have defaulted before reaching stability.
Preemption of Restrictive State Laws
Before 1973, state laws in many jurisdictions made HMOs difficult or impossible to operate. Some required medical society approval before any organization could deliver health services. Others mandated that physicians make up all or a fixed percentage of the governing board, required that all or a share of local physicians be allowed to join the network, or held HMOs to the same capital and reserve standards as traditional multi-line insurers.
The Act preempted those categories of state restrictions for federally qualified HMOs, along with any other state requirement that would prevent an organization from meeting federal HMO standards. The preemption applied only to entities that received federal grants or loans under the Act or held federal qualification for the employer mandate.10GovInfo. 42 USC 300e-10 – Restrictive State Laws and Practices Organizations that never sought federal qualification remained subject to state rules. Qualification, in other words, was both a passport into the employer market and a shield against hostile state regulation.
Quality Assurance and Member Grievances
Because prepayment creates a financial incentive to hold back on care, the Act built in safeguards. Every qualified HMO had to run an ongoing quality assurance program that focused on health outcomes, used peer review by physicians and other clinicians, collected systematic data on performance and patient results, and maintained written procedures for corrective action when substandard care was found or needed services went undelivered.2eCFR. 42 CFR Part 417 Subpart B – Qualified Health Maintenance Organizations: Services
Separately, every HMO had to set up a formal grievance process, giving members a structured way to challenge coverage denials or dispute the care they received.11Office of the Law Revision Counsel. 42 USC 300e – Requirements of Health Maintenance Organizations Together the two provisions reflected the tension at the center of the law: encourage cost control through prepayment, but insist on accountability when cost control goes too far.
The 1988 Amendments and the End of Dual Choice
Public Law 100-517, enacted in 1988, made the most significant changes to the Act. It introduced adjusted community rating, letting qualified HMOs set group-specific rates based on the projected utilization of each employer group. Under the original 1973 rules, HMOs had to charge essentially uniform rates across groups, which put them at a disadvantage against traditional insurers who could price each account individually. The amendments kept the prohibition on individual medical underwriting but allowed group-level differentiation.12United States Congress. Public Law 100-517 – HMO Amendments of 1988
The amendments also loosened the network rules. Where the original Act required that all basic physician services flow through the HMO’s own doctors, the 1988 version dropped that threshold to 90 percent, letting members see outside physicians for a limited share of their care if they paid a reasonable deductible.12United States Congress. Public Law 100-517 – HMO Amendments of 1988
The most consequential change put the dual choice mandate on a path to expiration. By the late 1980s managed care had enough market penetration to compete without a federal requirement propping up access. The mandate was repealed effective 1995. Federal qualification, community rating rules for qualified plans, and the underlying framework survived, but the obligation that had originally forced HMOs onto employer benefit menus was gone.