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HCUP Kids' Inpatient Database (KID)


Key web links

Home page

Home page for all HCUP datasets

Availability and description of data elements

Detailed review of KID and data access procedures:

Online overview of all HCUP databases

Dataset Summary

The Kids’ Inpatient Database (KID) is one in a family of databases and software tools developed as part of the Healthcare Cost and Utilization Project (HCUP).  The KID has been released every 3 years since 1997, and includes data elements from hospital discharge abstracts for children in participating States.  The KID includes data on diagnoses, procedures, admission and discharge status, demographics, charges and insurance status, length of stay, and hospital characteristics (such as teaching status and size).  Data can be accessed after completion of a Data Use Agreement, online training, and an application kit. The KID can be purchased  for $200 ($20 for Students) per data year. 

Expert comments

The HCUP KID is the only hospital administrative dataset designed specifically to assess use of hospital services by newborns, children, and adolescents.  It enables studies of specific conditions, procedures, and subpopulations that often cannot be assessed with other databases because children account for a relatively small proportion of hospital stays.  With the KID, researchers and policymakers can study a variety of detailed topics, including the incidence of rare conditions, the economic burden associated with specific procedures or conditions, pediatric conditions most often related with particular outcomes, and the impact of health policy changes.

Dataset Details

Dataset owner / manager

    Agency for Healthcare Research and Quality (AHRQ), under the Healthcare Cost and Utilization Project (HCUP)

Study and sample characteristics

    The Kids’ Inpatient Database is a sample of discharges from all community, non-rehabilitation hospitals in States participating in HCUP, conducted every 3 years since 1997. KID data is  drawn from the HCUP State Inpatient Databases (described elsewhere in this compendium).  A sampling strategy is used to identify patients for inclusion in the KID, and weights are provided to generate national and regional estimates.

    Participating States and other data can be found in:

Major foci

  • Major types of data collected include:
    • Primary and secondary diagnoses
    • Primary and secondary procedures
    • Admission and discharge status
    • Patient demographics (e.g., gender, age, race, median income for ZIP Code)
    • Expected payment source
    • Total charges
    • Length of stay
    • Hospital characteristics (e.g., ownership, size, teaching status).
  • See: The KID data files are  also include provided with measures of disease severity and information on diagnosis and procedures groups designed to facilitate analyses. More detailed information on data elements can be found at:

    See section on availability and description of data elements at:

    Special supplements and resources 

    The HCUP Cost-to-Charge Ratio files that allow conversion of billed charges (available in the main KID database) to hospital costs.

     The Hospital Market Structure File is a hospital-level file that contains measures of hospital market competition, allowing investigators to characterize the intensity of competition faced by specific hospitals under user-defined definitions of market area.

    The Kids’ Inpatient Database Trends (KID-Trends) File is a discharge-level file that provides trend weights consistently defined between 1997 and later years.

    Links to other datasets

    Data can be linked to the American Hospital Association Annual Survey, and some States provide identifiers allowing linkage to the Area Resource File.

    Information on linking to AHA Annual Survey files provided at:

    Papers published

    Click here for a PubMed search for articles using this dataset. 

    For a complete list of publications from the HCUP databases, see

    Publications may be searched by database at

    Examples of papers published using KID include:

    Incidence and trends of pediatric ovarian torsion hospitalizations in the United States, 2000-2006. Guthrie B,  Adler M, Powell E,
    Pediatrics. 2010 Mar;125(3):532-8.

    Motor vehicle injury, mortality, and hospital charges by strength of graduated driver licensing laws in 36 States.
    Pressley JC, Benedicto CB, Trieu L, Kendig T, Barlow B.
    J Trauma. 2009 Jul;67(1 Suppl):S43-53.

    Hospital utilization and costs among children with influenza, 2003.
    Hassan F, Lewis TC, Davis MM, Gebremariam A, Dombkowski K.

    Am J Prev Med. 2009 Apr;36(4):292-6. Epub 2009 Feb 7.

    Trends in hospitalizations for neonatal jaundice and kernicterus in the United States, 1988-2005.
    Burke BL, Robbins JM, Bird TM, Hobbs CA, Nesmith C, Tilford JM.
    Pediatrics. 2009 Feb;123(2):524-32.

    Preliminary assessment of pediatric health care quality and patient safety in the United States using readily available administrative data.
    McDonald KM, Davies SM, Haberland CA, Geppert JJ, Ku A, Romano PS.
    Pediatrics. 2008 Aug;122(2):e416-25.

    Dataset accessibility and cost

    Data are deidentified and available for use after purchase and completion of a Data Use Agreement, HCUP online training, and KID Application Kit.  Data cost $200 per year of data ($20 for students).

    Application kit

    HCUP Data Use Agreement

    Help Desk

     Additional support can obtained via
    • e-mail:

    • Phone (toll free): 1-866-290-HCUP

     See: for details.

    Request a consultation (SGIM members only)

      Members of SGIM may request a one-time consultation with an expert in this dataset, for example to explore research ideas or to troubleshoot a problem or vexing question.  Please click here for guidelines and the request process.