Public programs provide the primary source of coverage for most seniors and also low-income children and families who meet certain eligibility requirements. The primary public programs are Medicare, a federal social insurance program for seniors (generally persons aged 65 and over) and certain disabled individuals; Medicaid, funded jointly by the federal government and states but administered at the state level, which covers certain very low income children and their families; and CHIP, also a federal-state partnership that serves certain children and families who do not qualify for Medicaid but who cannot afford private coverage. Other public programs include military health benefits provided through TRICARE and the Veterans Health Administration and benefits provided through the Indian Health Service. Some states have additional programs for low-income individuals.[43] In 2011, approximately 60 percent of stays were billed to Medicare and Medicaid—up from 52 percent in 1997.[44]
Workers who receive employer-sponsored health insurance tend to be paid less in cash wages than they would be without the benefit, because of the cost of insurance premiums to the employer and the value of the benefit to the worker. The value to workers is generally greater than the wage reduction because of economies of scale, a reduction in adverse selection pressures on the insurance pool (premiums are lower when all employees participate rather than just the sickest), and reduced income taxes.[20] Disadvantages to workers include disruptions related to changing jobs, the regressive tax effect (high-income workers benefit far more from the tax exemption for premiums than low-income workers), and increased spending on healthcare.[20]
The US health insurance market is highly concentrated, as leading insurers have carried out over 400 mergers from the mid-1990s to the mid-2000s (decade). In 2000, the two largest health insurers (Aetna and UnitedHealth Group) had total membership of 32 million. By 2006 the top two insurers, WellPoint (now Anthem) and UnitedHealth, had total membership of 67 million. The two companies together had more than 36% of the national market for commercial health insurance. The AMA has said that it "has long been concerned about the impact of consolidated markets on patient care." A 2007 AMA study found that in 299 of the 313 markets surveyed, one health plan accounted for at least 30% of the combined health maintenance organization (HMO)/preferred provider organization (PPO) market. In 90% of markets, the largest insurer controls at least 30% of the market, and the largest insurer controls more than 50% of the market in 54% of metropolitan areas.[116] The US Department of Justice has recognized this percentage of market control as conferring substantial monopsony power in the relations between insurer and physicians.[117]
Between October 28 and November 13, 2009, Democratic Senator Dick Durbin's campaign organization polled Americans to rank their support for various forms of the "public option" currently under consideration by Congress for inclusion in the final health care reform bill. The 83,954 respondents assigned rankings of 0 to 10. A full national option had the most support, with an 8.56 average, while no public option was least favored, with a 1.10 average.[52]
Health insurance companies are not actually providing traditional insurance, which involves the pooling of risk, because the vast majority of purchasers actually do face the harms that they are "insuring" against. Instead, as Edward Beiser and Jacob Appel have separately argued, health insurers are better thought of as low-risk money managers who pocket the interest on what are really long-term healthcare savings accounts.[131][132]
Individuals injured on the job while employed by private companies or state and local government agencies should contact their state workers' compensation board. The Department of Labor has several programs designed to prevent work-related injuries and illnesses. You may obtain information about these programs by visiting the Workplace Safety & Health page.

The Affordable Care Act dramatically expanded Medicaid. The program will now cover everyone with incomes under 133% of the federal poverty level who does not qualify for Medicare, provided this expansion of coverage has been accepted by the state where the person resides. Meanwhile, Medicaid benefits must be the same as the essential benefit in the newly created state exchanges. The federal government will fully fund the expansion of Medicaid initially, with some of the financial responsibility gradually devolving back to the states by 2020.
The Consolidated Omnibus Budget Reconciliation Act of 1985 (COBRA) enables certain individuals with employer-sponsored coverage to extend their coverage if certain "qualifying events" would otherwise cause them to lose it. Employers may require COBRA-qualified individuals to pay the full cost of coverage, and coverage cannot be extended indefinitely. COBRA only applies to firms with 20 or more employees, although some states also have "mini-COBRA" laws that apply to small employers.
All regular full-time employees are required to enroll in a retirement plan. Regular part time employee’s enrollment is optional. Employees who are non-US citizens on F-1 or J-1 visas are not eligible for retirement membership. Non-exempt employees are automatically enrolled in the Tennessee Consolidated Retirement System Hybrid (TCRS). TCRS is a defined benefit and contributory plan which requires 5 years of service to vest. Exempt employees have the option to elect the TCRS Hybrid or Optional Retirement Program Hybrid (ORP). The ORP is a defined benefit and contributory plan with no vesting requirements. Both retirement options require a monthly employee contribution of 5%.

Coverage limits: Some health insurance policies only pay for health care up to a certain dollar amount. The insured person may be expected to pay any charges in excess of the health plan's maximum payment for a specific service. In addition, some insurance company schemes have annual or lifetime coverage maxima. In these cases, the health plan will stop payment when they reach the benefit maximum, and the policy-holder must pay all remaining costs.

A 2011 study found that there were 2.1 million hospital stays for uninsured patients, accounting for 4.4% ($17.1 billion) of total aggregate inpatient hospital costs in the United States.[12] The costs of treating the uninsured must often be absorbed by providers as charity care, passed on to the insured via cost-shifting and higher health insurance premiums, or paid by taxpayers through higher taxes.[13]