The National Health Interview Survey (NHIS) is the principal source of information on the health of the civilian noninstitutionalized population of the United States and is one of the major data collection programs of the National Center for Health Statistics (NCHS) which is part of the Centers for Disease Control and Prevention (CDC). The National Health Survey Act of 1956 provided for a continuing survey and special studies to secure accurate and current statistical information on the amount, distribution, and effects of illness and disability in the United States and the services rendered for or because of such conditions. The survey referred to in the Act, now called the National Health Interview Survey, was initiated in July 1957. Since 1960, the survey has been conducted by NCHS, which was formed when the National Health Survey and the National Vital Statistics Division were combined. NHIS data are used widely throughout the Department of Health and Human Services (DHHS) to monitor trends in illness and disability and to track progress toward achieving national health objectives. The data are also used by the public health research community for epidemiologic and policy analysis of such timely issues as characterizing those with various health problems, determining barriers to accessing and using appropriate health care, and evaluating Federal health programs. The NHIS also has a central role in the ongoing integration of household surveys in DHHS. The designs of two major DHHS national household surveys have been or are linked to the NHIS. The National Survey of Family Growth used the NHIS sampling frame in its first five cycles and the Medical Expenditure Panel Survey currently uses half of the NHIS sampling frame. Other linkage includes linking NHIS data to death certificates in the National Death Index (NDI). While the NHIS has been conducted continuously since 1957, the content of the survey has been updated about every 10-15 years. In 1996, a substantially revised NHIS questionnaire began field testing. This revised questionnaire, described in detail below, was implemented in 1997 and has improved the ability of the NHIS to provide important health information.

2019–present. The National Health Interview Survey (NHIS) is a nationally representative household health survey of the U.S. civilian noninstitutionalized population. The NHIS data are used to monitor trends in illness and disability, track progress toward achieving national health objectives, for epidemiologic and policy analysis of various health problems, determining barriers to accessing and using appropriate health care, and evaluating Federal health programs. NHIS is conducted continuously throughout the year by the National Center for Health Statistics (NCHS). Public-use data files on adults and children with corresponding imputed income data files, and survey paradata are released annually. The NHIS data website (https://www.cdc.gov/nchs/nhis/documentation/index.html) features the most up-to-date public-use data files and documentation for downloading including questionnaire, codebooks, CSV and ASCII data files, programs and sample code, and in-depth survey description. Most of the NHIS data are included in the public use files. NHIS is protected by Federal confidentiality laws that state the data collected by NCHS may be used only for statistical reporting and analysis. Some NHIS variables have been suppressed or edited in the public use files to protect confidentiality. Analysts interested in using data that has been suppressed or edited may apply for access through the NCHS Research Data Center at https://www.cdc.gov/rdc/. In 2019, NHIS launched a redesigned content and structure that differs from its previous questionnaire designs. NHIS has been conducted continuously since 1957.

Interactive Summary Health Statistics for Children provide annual estimates of selected health topics for children under age 18 years based on final data from the National Health Interview Survey.

Data source description - Adults: NHIS monitors the health of the U.S. population by collecting and analyzing data on a broad range of health topics. Interviews are conducted continuously throughout the year, and are initiated in-person, with telephone follow-up. NHIS focuses on the health of children and adults in the United States. One adult household member is randomly selected to be the subject of a detailed health interview. If children are present, one child is also randomly selected. Adults answer on their own behalf, while a knowledgeable adult answers on behalf of the selected child. NHIS topics featured include adult life satisfaction, anxiety, depression, mental health conditions, mental health care, and social and emotional support.

Data source description - Teenagers: NHIS-Teen was a web-based health survey of teenagers between the ages of 12 to 17. Answers from teenagers helped paint a picture of the health of teenagers living in the United States. NHIS-Teen covered questions on a variety of health topics, including doctor visits, mental health, and social and emotional support. Data were collected between July 2021 and December 2023. 

For additional information, please see: https://www.cdc.gov/mental-health/about-data/mental-health-data-sources.html" target ="_blank">Mental Health Data Sources.

The National Health Interview Survey (NHIS)—Teen was a follow-back survey of Sample Children ages 12-17 years old (herein teen) for whom a parent completed the National Health Interview Survey (NHIS) and also provided permission for the teen to participate. NHIS—Teen is a self-administered survey that teens completed themselves either on the web or paper (mailed). Recruitment for NHIS—Teen occurred July 2021—December 2023 during the NHIS Sample Child interview. Teens with permission received an invitation to go online and complete a questionnaire about their own health. Mailed paper questionnaires were sent to nonrespondents. Questions were included to test concordance with parent-reported responses, address time-sensitive data needs, assess public health attitudes or behaviors, and contribute to developmental work to understand differences between parent and self-reported measures of health.

The majority of NHIS—Teen survey content focused on the health behaviors, social and emotional wellbeing, and healthcare experiences of teens. Detailed sociodemographic characteristics (e.g. health insurance coverage type, family income) as reported by the parent in the NHIS Sample Child interview can be linked to NHIS—Teen. NHIS—Teen was a pilot survey with data collection concluding in March 2024. There are currently no plans to field additional iterations.

NHIS Adult Summary Health Statistics

  Description

Interactive Summary Health Statistics for Adults provide annual estimates of selected health topics for adults aged 18 years and over based on final data from the National Health Interview Survey.

  Dataset Details

Publisher: Centers for Disease Control and Prevention Temporal Coverage: 2019/2023 Last Modified: 2025-04-21 Contact: National Center for Health Statistics (cdcinfo@cdc.gov)

  Source

Original… See the full description on the dataset page: https://huggingface.co/datasets/HHS-Official/nhis-adult-summary-health-statistics.

In 2023, there were around ***** million beneficiaries of National Health Insurance Service (NHIS) policies in South Korea. This represents an increase compared to the previous year. The total number of beneficiaries has slowly been increasing over the past decade, up from just under ** million in 2013.

In 2023, around ***** percent of the expenses of South Korea's universal healthcare service, the National Health Insurance Service, stemmed from insurance payouts paid to insurance holders. Less than *** percent of costs were related to the management and operation of the insurances. That year, this governmental public health insurance program recorded combined expenses of about **** trillion South Korean won, an increase of over *** trillion won compared to the previous year.

BackgroundCoronary heart disease (CHD) represents a critical cardiovascular ailment necessitating thorough investigation. This research endeavors to explore the potential link between COVID-19 vaccination and CHD, using data from the National Health Interview Survey (NHIS).MethodsThe study encompasses 20,906 participants from the 2023 NHIS cohort, and these participants were stratified into two groups: CHD patients and non-CHD individuals (controls). To determine the protective factors for CHD, both univariate and multivariate logistic regression analyses were carried out. Furthermore, Receiver Operating Characteristic (ROC) curves were plotted to assess the predictive performance of models that consider COVID-19 vaccination as a potential protective factor against CHD.ResultsIn this study, a number of potential risk factors were investigated, including age (AGEP_A), sex (SEX_A), and race (RACEALLP_A) et al. Among them, the number of COVID-19 vaccinations was confirmed to be an effective protective factor for preventing coronary heart disease. Univariate logistic regression analysis showed that the risk of coronary heart disease was reduced in people who received 2 doses (OR = 0.68, 95% CI 0.49–0.92, p = 0.016), 3 doses (OR = 0.47, 95% CI 0.34–0.63, p 

As of July 2025, the population registered with the National Health Insurance Scheme (NHIS) in Nigeria reached ** million. This increased by just over ** percent compared to 2023. A reported enabling factor to this increase was the government's aim to surpass the set target for universal health insurance in the country.

In 2023, the total income of South Korea's universal healthcare service, the National Health Insurance Service, amounted to around 96.4 trillion South Korean won. The income of the government's public health insurance program has been steadily increasing over the past decade. Over the past decade, the program's income has increased by over 104 percent.

In 2023, around 13.9 million South Koreans insured under the government's public health insurance program National Health Insurance Service (NHIS) lived in Gyeonggi (Gyeonggi Province). A further 9.5 million lived in the capital city of Seoul. In South Korea, the number of people with public insurance are nearly identical to the total population.

In 2023, around 85.15 percent of income generated by the South Korean government's universal health insurance program National Health Insurance came from insurance premiums paid by customers. A further 11.36 percent was derived from government subsidies. That year, the insurance program achieved a combined income of about 96.4 trillion South Korean won, a five trillion won increase from the previous year.

Universal Health Coverage (UHC) aims to provide access to quality health services to all while avoiding financial hardship. Strategies can include establishing a national health insurance scheme (NHIS). However, variations in the progress exist among countries with an NHIS. This study assesses strategies adopted in low- and lower-middle-income countries (LLMICs) with an NHIS to expand UHC. The research entailed a descriptive, qualitative review of the literature on LLMICs that have implemented an NHIS. PRISMA guidelines were used to identify studies and reports. A total of 569 texts were identified from 4 databases. A total of 78 texts were included, spanning 7 countries from Sub-Saharan Africa and 4 from Asia. The search was conducted in March 2023 and updated in April 2024. An analytical framework was used to systematically collect, analyze, and synthesize key features to review healthcare financing mechanisms and coverage dimensions. Countries generate revenue through various public and private means, including taxes, premiums, and out-of-pocket payments. Some have consolidated revenue streams into a single pool for efficiency, while others maintain separate pools. Healthcare services are procured from public and private providers, differing by country. Fee-for-service is the prevalent payment method, but capitation systems have been attempted to control expenses. Population coverage depends on whether enrollment in an NHIS is mandatory or voluntary and on its enforcement. Service provision can be comprehensive and universal or can vary with specific schemes. Mechanisms to avoid financial hardship can involve premium exemptions or subsidies. Progressing toward UHC requires addressing issues of financial sustainability, cost-containment, enrollment expansion, financial protection, and health equity. While policy options are context-specific, this review showcased experiences for other LLMICs committed to UHC with an NHIS. Recommendations on health financing include increasing the allocation of tax revenues to the insurance scheme, merging risk pools, and adopting strategic purchasing.

In 2023, South Korea's universal healthcare service, the National Health Insurance Service (NHIS), spent an average of around 2.2 million South Korean won per capita on the medical expenses of their insurance policyholders. This represents a slight increase compared to the previous year. Costs have been steadily increasing over the past decade, up from about one million won in 2013.

In 2023, the South Korean government's public health insurance program National Health Insurance Service carried around 63.2 percent of all medical expenditure that year. The rest of the medical costs are taken on by private health insurers.

In 2023, the South Korean government's public health insurance program National Health Insurance Service (NHIS) made up around 63.2 percent of the total medical expenditure that year. The remaining 36.8 percent of medical costs were taken on by private insurance companies. The NHIS has taken on a slowly increasing share of the total medical expenses. Medical expenditure in South Korea In 2023, South Korea’s total national medical expenditure amounted to about 112.4 trillion South Korean won. Both total and per capita spending have risen over the past decade, further leading to increases in premiums. The NHIS is a compulsory universal health insurance scheme run by the government and is financed by a payroll tax. It covers roughly 68 percent of hospital inpatient costs. The role of private health insurance in South Korea With the NHIS only covering part of the insured’s medical costs, it is common in South Korea to pay for additional private health insurance. As this represents an additional cost on top of NHIS premiums, the share of households covered and the extent of personal health coverage varies by income. On average, privately insured households held 4.99 private health insurance subscriptions. In comparison, low-income households only had 2.45 subscriptions on average.

IntroductionAn increase in home delivery among expectant mothers may likely lead to high maternal and newborn morbidities and mortalities. Despite the policy on free maternal healthcare in Ghana under the National Health Insurance Scheme (NHIS) since 2007, more than 25% of deliveries still occur outside health facilities in northern Ghana. Use of safe and effective delivery services including place of delivery is an important component of the Safe Motherhood concept. Hence, assessing predictors of institutional delivery could contribute to improving birth outcomes in the Northern Region.MethodsWe conducted a community-based cross-sectional survey of 310 women aged 15–49 years old who had given a live birth between January 2022 and January 2023, using a simple random sampling approach. Using a semi-structured questionnaire, we collected data on mothers’ background characteristics, place of delivery for their most recent birth and reported health facility factors. Descriptive analyses and multiple logistic regression models were performed to identify factors associated with institutional delivery at a 5% significance level.ResultsOf 310 women in the study, the prevalence of institutional delivery was 79%(245) in their most recent births. More than 60%(200/310) of the women were married and 53%(163/310) had no formal education. Being married (adjusted odds ratio {aOR}=2.8, 95%CI:1.48–5.32), the presence of skilled health personnel at post (aOR=2.9, 95%CI:1.54–5.43), reported positive attitude of health workers towards their clients (aOR=1.8, 95%CI:1.03–3.23) and positive community perception of health facility delivery (aOR=3.8, 95%CI:1.64–8.71) were associated with increased odds of institutional delivery.ConclusionsOur study identified multiple predictors of institutional delivery; marital status, the presence of skilled health personnel at health facilities, the perceived attitude of health workers and community perception. The research team organized discussions on institutional delivery services with community members in five selected districts in the region. We recommend the Ministry of Health should develop well-defined care packages targeting unmarried pregnant women, negative health worker attitudes and negative community perceptions.