The US health care system consists of a multitude of subsystems and is subject to different regulations in different states. There is no universal health care coverage, and a significant number of individuals do not have health insurance. Health insurance may be funded by the state (e.g., Medicare), employers, individuals, or a combination thereof. There are two widely used health insurance payment models, which are used by both public and private health insurance systems: fee-for-service and value-based performance models.
According to the US Census Bureau reports published in September 2020: 
- 8% (26.1 million) of Americans did not have health insurance during 2019.
- 92% of Americans had health insurance coverage during 2019.
- 68% via private insurance
- 34.1% via public insurance
Government-funded health insurance
- Definition: any of the federal social healthcare programs enacted with the revisions to the Social Security Act aimed at providing health insurance to specific groups
- Individuals ≥ 65 years old
- Patients with or
- Individuals with permanent disabilities irrespective of age
Parts: The two main coverage options are Original Medicare (part A and part B) and Medicare Advantage (part C). Individuals also have the option of adding part D to their main coverage.
- Part A: hospital care, for terminal patients, skilled nursing facility care (if services are needed daily after a minimum 3-day stay in a hospital)
- Part B: doctors' fees, emergency department visits, diagnostic tests, rehabilitation
- Part C (Medicare Advantage Plan): all services covered by parts A and B, plus a private insurance plan
- Part D: prescription drugs
- Funds: jointly funded by the state and federal government
- Beneficiaries must be American citizens or lawful permanent residents.
- Individuals must live in the state in which they receive their coverage.
Financial: households with an income at or below 133% of the federal poverty level (which includes individuals, families, and pregnant women)
- All low-income Americans < 65 years of age
- Children at 133% of the federal poverty level are covered in every state.
- Coverage for adults with an income at or below 133% of the federal poverty level is decided by each state.
- Coverage: hospital care, laboratory tests, diagnostic tests (such as x-rays), doctors' visits, skilled nursing care, vaccinations, home health care
Children's health insurance program (CHIP)
- Eligibility: uninsured children of families with low income, but not low enough to qualify for Medicaid
Private health insurance
- Used by more than half of the American population
- May be employer-sponsored (most common) , college-sponsored, or purchased individually
Self-pay patient 
- Individuals who pay out-of-pocket for a health care service and do not have any third-party coverage from a government entity (e.g., Medicare, Medicaid), private health care insurer, or plan
- Typically includes patients who:
- Cannot or do not want to pay a fixed monthly premium
- Have chronic or preexisting conditions not covered by an insurance company
Health insurance basics
Health insurance premium 
- Definition: a payment made to the health insurance provider, typically monthly. Premiums usually depend on the policy type and individual risk.
- The premium depends on the type of policy and individual factors (e.g., individual or family plan).
- The deductible, copayments, and coinsurance are paid separately.
- It can be paid by individuals (monthly), an employer, or both.
- If individuals receive insurance through an employer, they pay the premium through payroll deductions.
- Generally, plans with a higher premium will have lower out-of-pocket expenses (i.e., a lower deductible and copayments).
- Definition: payments made by individuals to their insurance company, including deductibles, coinsurance, and copayments
- An annual limit on the amount of money that an individual has to pay for covered health care services in a year (not including premiums)
- After this amount is reached, all covered health services are paid in full by the health plan for the rest of that plan year.
- Payments that apply to the deductible, copays, and coinsurance also apply to the out-of-pocket maximum.
- Definition: a predetermined amount paid out of pocket by the patient before the insurance company begins to pay
Types of deductible
- Comprehensive deductible: applies to and includes all areas of coverage of the health insurance policy
- Applies to specific areas of coverage or medical expenses in a health insurance policy
- Not all medical areas of coverage in the plan have a deductible.
- Individual deductible: a deductible that each individual in the plan pays
Family deductible: a deductible that usually applies to two or more individuals
- Embedded deductible
- True family deductible
- Typically annual
- After the deductible is paid, the individual usually only pays for copayment or coinsurance for covered services.
- Generally, plans with lower monthly premiums have higher deductibles and vice versa.
- Example: A $2,000 deductible means the individual needs to pay $2,000 in medical expenses. After reaching that amount, the insurance provider covers the remainder.
- Definition: a fixed amount paid by the patient to a health service provider at the time of the service (e.g., doctor's appointment, filling of a prescription)
- Typically defined in the insurance policy
- Paid each time the patient receives medical services
- The amount can vary by the type of service (e.g., prescription drugs, lab tests).
- Meant to discourage individuals from seeking unnecessary medical care
- Sometimes counts towards meeting the deductible
- Generally, plans with lower monthly premiums have higher copayments and vice versa.
- Example: a health insurance plan that allows a doctor's appointment cost of $100 and sets the copayment for this service at $20
- Definition: a payment of a predetermined percentage made to the insurance provider after the individual has met the deductible
- Refers to the individual's share of the costs of a health care service
- Must be paid before any policy benefit is paid by the insurance company
- This applies to covered services and is paid in addition to the copayment.
- Typically paid after the individual meets the deductible
- Billed by the provider directly to the individual
- Generally, plans with low monthly premiums have higher coinsurance and vice versa.
- Example: If an insurance plan covers 85% of the costs, the individual is responsible for the remaining 15% (this 15% is the coinsurance).
Health insurance network (preferred providers) 
- Definition: a group of health care providers, suppliers, and facilities that have a contract to provide services to members of health insurance plans at a discounted rate
- A health care professional, hospital, and/or service provider who has a contract with the insurance company to provide services at a discounted price
- In-network copayment and coinsurance usually cost less than out-of-network copayment and coinsurance.
- Exclusive provider organization (EPO) and health maintenance organization (HMO) plans only cover in-network care, except in the case of a medical emergency.
- A health care professional, hospital, and/or service provider who does not have a contract with the insurance company to provide services at a discounted price
- Out-of-network copayment and coinsurance usually cost more than in-network copayment and coinsurance.
- Preferred provider organization (PPO) plans may have out-of-network care coverage. However, the out-of-pocket cost for out-of-network care may be significantly higher than for in-network care.
Health care payment models and health insurance plans
Health care payment models 
- Health care providers are compensated by the insurer and/or patient for each individual service provided (e.g., individual laboratory tests, imaging studies, procedures).
- Dominant payment model in the US
- Incentivizes health care providers to overtreat patients because compensation is based on the number of services provided
- Associated with high overall health care costs
- A fixed payment schedule with discounted prices negotiated between health care providers and payers for each individual service
- Often used by PPOs
Per diem payment (per day payment)
- A fixed amount per patient per day paid to the health care provider for a specific care service provided, regardless of the actual costs involved in providing services for a particular patient.
- Often used for reimbursement of inpatient services
- The rates are typically stratified. A hospital can be paid different rates depending on the service provided (e.g., a hospital is paid a rate for a surgical day and a higher rate for a critical care unit day).
- Health care practitioners are compensated a fixed amount by the insurer during each payment period, regardless of the actual amount of health care services utilized by the patient.
- Often used by HMOs
- The payment period is usually monthly.
- Incentivizes health care providers to deliver efficient care (e.g., cost-effective preventive health care to avoid larger downstream costs)
- Carries the risk that patients will be undertreated because compensation is not based on the quantity or quality of services provided
Global payment 
- The insurer makes a single, fixed payment to a health care organization for the needs of a population of patients (i.e., enrollees in a health plan) during a specified time period (e.g., monthly or yearly) for expenses associated with an incident of care.
- Usually paid to a single health care organization
- Covers a wide range of services: typically includes physician fees, hospital services, tests, prescription drugs, and other services, such as follow-up visits
- Often used for nonurgent surgery, with the coverage extending to all costs associated with the pre- and postoperative visits
- Incentivizes health care providers to coordinate, deliver efficient care, and keep expenses low
- Holds providers fully accountable for compensated services
Bundled payment 
- The insurer makes a fixed payment to a health care organization for all services provided for a clinically-defined episode of care (e.g., , ).
- The compensation is distributed among all health care providers involved in the care of the patient during that defined episode.
- Incentivizes health care providers to deliver coordinated and efficient care (e.g., health care providers avoid unnecessary procedures, duplicate tests)
- Typically based on the estimated cost of all of the services a patient would require during a single medical treatment episode or procedure
- Example: a payment beginning 2 days prior to a knee replacement surgery and extending 30 days past a patient’s discharge from the hospital for this procedure
Pay for performance (P4P) 
- A payment model in which compensation depends on health care providers meeting certain metrics for the quality and efficiency of care provided
Calculated using specific measures of quality and by determining the overall health of populations
- Providers are required to report specific metrics (e.g., safety, clinical care, efficiency and cost reduction, and patient and caregiver-centered experience) to payers and demonstrate improvement.
- Providers typically track and report data on hospital readmissions, adverse events, population health, and patient engagement.
- Improves value and quality of care by encouranging adherence to clinical guidelines and proven best practices (move from volume to value and better outcomes) through financial incentives
- Motivates health care providers to protect and improve their reputation; improves accountability and transparency
Reimbursement issues: Medicare penalizes hospitals with poor performance.
- Payments are reduced by 2% and the funds are redistributed if the provider's performance or quality of care measures are unsatisfactory.
- Hospitals with high readmission rates for specific episodes of care (i.e., myocardial infarction, heart failure, COPD, pneumonia) have their payments reduced by up to 3%.
- Hospitals in the bottom quartile of performance based on nosocomial conditions with high readmission rates (e.g., , , , , ) have their payments reduced by 1%.
- High administrative costs to gather data
- Reduces access for socioeconomically disadvantaged patients: Health practitioners may not be incentivized to treat these patients, as they may have difficulty attending follow-ups and paying for treatment, which may lower performance on P4P measures.
- Reimbursement issues: Medicare penalizes hospitals with poor performance.
Common types of health insurance plans
|Health insurance plans|
|Common health insurance plans||Health care delivered through||Coverage||Specialist care||Member costs|
|Health maintenance organization (HMO)|| || || |
|Point-of-service (POS)|| || || |
|Preferred provider organization (PPO)|| || || || |
|Exclusive provider organization (EPO)|| || |
|Accountable care organization (ACO)|| || || || |
Certain population subgroups, especially those with lower socioeconomic status, are more likely to live and work in environments with fewer opportunities to pursue a healthy lifestyle and balance the effects of chronic stress. Consequently, on average, members of these subgroups have poorer health outcomes and a shorter life expectancy.
Recognizing and addressing inequalities due to social health determinants can improve the health of the most vulnerable and at-risk groups.
Health care disparity 
- Definition: differences in health care quality and/or outcomes among specific populations due to economic, social, and/or environmental factors
- Access to healthcare
- Quality of care received
- Earlier onset of illness
- Severe disease
- Poorer quality of care
- Reduced lifespan
Social determinants of health 
- Definition: the political, cultural, and socioeconomic conditions into which individuals are born and with which they live that have an impact on health, e.g., education, the environment, nutrition, wealth distribution, gender, race, and/or access to health care
Race or ethnicity 
- On average, minorities, particularly black, Asian, and Latino Americans, have more limited access to health care and other community health resources.
- These individuals are often more acutely ill when they do find a source of care and incur higher medical costs.
- Studies have shown that physicians tend to have unconscious racial bias, leading to poorer communication and lower quality of care.
Gender roles, identity, and sexual orientation
- Members of the LGBTQ community may experience discomfort with genital, breast, or rectal exams, or when discussing sexual issues.
- Judgemental attitudes toward patients compromise the doctor-patient relationship and physician's ability to provide good health care. They also discourage patients from seeking medical attention
Education and literacy
- Considered the strongest social determinant of health
- An individual's level of education influences their type of employment and potential income, which in turn influence an individual's socioeconomic status
Low literacy can negatively impact an individual's health outcome
- Without the appropriate literacy skills, patients may not be able to obtain and understand basic health information and services needed to make appropriate health decisions for themselves.
- Results in barriers to health care and insurance access
- Associated with adverse health outcomes due to underutilization of preventive services, increased rates of hospitalization, nonadherence to treatments, and higher mortality rates 
Socioeconomic status 
- Mostly determined by race/ethnicity in the US
- Low socioeconomic status often involves reduced access to job opportunities and higher education.
- Income determines access to social and health resources (e.g., timely health care, preventive health care, healthy habits, food security).
- Low-income populations are more likely to be targeted by the fast food and tobacco industries, which encourage unhealthy habits. 
- Access to and/or affordability housing (e.g., unaffordability increases the risk of homelessness)
- Environmental hazards are associated with poor housing conditions (e.g., presence of mold, water leaks, lead paint)
- Access to nutritious food, transportation, parks, clean water, unpolluted air, low crime rates, safe streets, and sidewalks
- Individuals living in disadvantaged neighborhoods are more likely to have poor health outcomes and chronic conditions.
Mental health and disabilities
- Interpersonal safety: Individuals who live in households in which family members are abusers, have committed crimes, and/or have drug and alcohol use disorders are more likely to have mental health and/or substance use disorders later in life.
Individuals with disabilities have more challenges accessing economic opportunities and resources (e.g., technology, fitness facilities).
- Negatively affects socioeconomic status and social environment
- Leads to decreased access to health care
Approach towards social determinants of health 
- Learn about how social factors influence health.
Acknowledge and address implicit bias.
- Look for behaviors that signal mistrust in the patient.
- Inquire about past experiences of racism in a healthcare setting and acknowledge the possible harm done.
- Treat patients with dignity and respect.
Inquire about and seek to understand the patient's community.
- Create a safe space for disclosure of information.
- Evaluate a patient's mental health and social support systems.
- Inquire about cultural preferences/norms (e.g., culturally-imposed beliefs, awareness and acceptance of cultural differences, procedures and tests the patient's culture prohibits).
- Determine how the patient wants to address their health problem.
- Inform the patient that members of the community can be present at consults.
- Establish a rapport with the local health departments and county and city health officials.
- Encourage health care teams to ask patients about their social challenges and connect patients with resources within their communities (e.g., organizations that provide financial assistance, food assistance, job placement, and training).
Develop processes that promote health literacy by presenting information clearly and adapting to the patient. 
- In the case of a language barrier, document the language preference and assess the need for medical interpretation.
- Maintain eye contact and avoid speaking too quickly.
- Break down information by repeating instructions in an understandable manner (i.e., use plain language instead of medical jargon or technical language).
- Use visual aids to illustrate a procedure or condition.
- Assess the patient's understanding of the information provided without shaming them or causing embarrassment.
- Have the patient explain the instructions themselves and/or demonstrate the relevant procedures.
- Provide the patient with forms and educational resources in their own language.
- Schedule follow-up appointments with a family member present.
Health care access
US Congress and state legislatures have implemented a number of policies in attempts to extend and guarantee access to health care.
Emergency medical treatment and labor act (EMTALA) 
- Definition: an act passed by Congress in 1986 that requires emergency departments to evaluate, treat, and stabilize patients presenting with emergency medical conditions (including labor) regardless of the patient's ability to pay for the treatment provided
- Hospitals cannot refuse emergency treatment for any reason, including age, sex, religious affiliation, or other characteristics.
- Hospitals should not obtain prior authorization from the insurance company before screening or stabilizing a patient.
- Hospitals can be held liable for injuries or deaths that result from refusing to admit or treat a patient.
- EMTALA has led to inappropriate use of the emergency department by uninsured patients and subsequent overcrowding.
- Negatively affects the efficiency and type of services provided (e g., prolonged waiting times, stressful therapeutic environments, poor clinical outcomes)
Reimbursement issues 
Health plans deny or reduce payments, claiming:
- Treatment was not medically necessary.
- The individual did not have an emergency condition.
- Treatment was provided at an out-of-network hospital.
- The number of physicians willing to serve in emergency departments has declined due to uncompensated care.
- Hospitals are closing emergency departments and are under increasing financial strain: Hospitals made up for uncompensated care by charging more for services for the insured. However, due to changes in the payment system, this is no longer possible.
- Health plans deny or reduce payments, claiming:
Critical access hospital 
- Definition: a designation created by Congress in 1997, through the Balanced Budget Act, that is assigned to small hospitals in rural areas by the Centers for Medicare and Medicaid Services in order to ensure and improve access to health care services
- Improve access to health care services in rural areas
- Reduce the financial vulnerability of hospitals in rural areas
- Specific requirements must be met (e.g., ≤ 25 inpatient beds, located ≥ 35 mi or ≥ 56 km from another hospital, continuous emergency care services).
- Each state decides how Medicaid reimbursements will be paid (e.g., pay-for-performance, fee-for-service).
- Critical access hospitals need to maintain quality assurance and improvement with organizations or hospitals that are part of the network.
- Negatively affects the efficiency and type of services provided due to challenges in recruitment and retention of health care professionals
- Reimbursement issues lead to financial insecurity for some hospitals.
Affordable care act (Obamacare) 
- Definition: a comprehensive health care reform law made by the US Congress in 2010 to ensure and expand affordable health care
- Make health insurance affordable for more people, especially individuals who cannot afford it
- Expansion of eligibility for Medicare
- Support health care delivery models that lower the costs of health care
- Individuals are required to have health insurance for a minimum of 9 months out of every year.
- Dependent children are covered until they reach the age of 26.
- It subsidizes the cost of health insurance for people who have income below the federal poverty level.
- Individuals pay reduced copayments and deductibles.
- Services such as preventive screenings, prescription drugs, laboratory tests, hospitalization, and outpatient, maternity, mental health, and rehabilitative services are included.
- Increased costs for insurance companies
- Beneficiaries need to show proof of employment before being eligible for Medicaid.
Patient-centered medical home (PCMH) 
- Definition: a health care delivery model that provides comprehensive advanced primary care coordinated through the individual's primary care physician
- Facilitate patient and physician partnership
- Patients receive necessary treatment at the time and place they need it
- Improve quality and experience for patients and health care providers
- Lower medical costs
- Patient-centered approach
- The primary care physician is the first point of contact.
- A multidisciplinary health care team is assembled according to the patient's need
- Based on five core functions
- Accessibility and continuity of services
- Comprehensive and coordinated care
- Patient and caregiver satisfaction
- High-quality care and patient safety
- Planned care and population health management
- Not enough data to assess effectiveness
- Not enough payers currently adopting this model
- Evidence on cost is mixed.