NIS Database Documentation

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html lang="en"> <head><script type="text/javascript" src="/_static/js/bundle-playback.js?v=HxkREWBo" charset="utf-8"></script> <script type="text/javascript" src="/_static/js/wombat.js?v=txqj7nKC" charset="utf-8"></script> <script>window.RufflePlayer=window.RufflePlayer||{};window.RufflePlayer.config={"autoplay":"on","unmuteOverlay":"hidden"};</script> <script type="text/javascript" src="/_static/js/ruffle/ruffle.js"></script> <script type="text/javascript"> __wm.init("https://web.archive.org/web"); __wm.wombat("http://www.hcup-us.ahrq.gov/db/nation/nis/nisdbdocumentation.jsp","20140717053343","https://web.archive.org/","web","/_static/", "1405575223"); </script> <link rel="stylesheet" type="text/css" href="/_static/css/banner-styles.css?v=S1zqJCYt" /> <link rel="stylesheet" type="text/css" href="/_static/css/iconochive.css?v=3PDvdIFv" />  <title>NIS Database Documentation</title> <link rel="stylesheet" href="/web/20140717053343cs_/http://www.hcup-us.ahrq.gov/HCUP_US.css"> <meta name="keywords" content="hcup, healthcare cost and utilization project, health, healthcare, health statistics, data analysis, analysis, data collection, data processing, databases, research">  <script type="text/javascript"> var steering = false; var team = false; var partner = false; var nhqrdr = false; </script> <script type="text/javascript" src="/web/20140717053343js_/http://www.hcup-us.ahrq.gov/menu/c_config.js"></script> <script type="text/javascript" src="/web/20140717053343js_/http://www.hcup-us.ahrq.gov/menu/c_smartmenus.js"></script>  </head> <body> <div id="skipmenu"> <a href="#skip" class="skippy">Skip Navigation</a> <a name="top"></a> </div> <div id="hideShow"> <table summary="layout" width="100%" cellspacing="2" cellpadding="0" border="0"> <tr> <td align="center" class="logoPanel" bgcolor="#006699"> <div id="logo"> <a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/"><img src="/web/20140717053343im_/http://www.hcup-us.ahrq.gov/images/HCUP_logo/hcuplogo_smaller_final.jpg" alt="Healthcare Cost and Utilization Project logo"></a> </div> </td> <td bgcolor="#66cccc" class="bannerPanel"><br> <div class="bannertitleinteriorpgs">NIS Database Documentation</div> <div class="bannertext">The National (Nationwide) Inpatient Sample (NIS) is the largest publically available all-payer inpatient care database in the United States, containing data on more than seven million hospital stays each year.</div> </td> <td bgcolor="#66cccc" valign="middle" class="searchPanel"> <form method="get" action="/web/20140717053343/http://www.hcup-us.ahrq.gov/search/Search.action"> <table cellpadding="0px" cellspacing="0px"> <tr> <td class="searchBox"> <input type="text" name="query"> </td> <td valign="middle" class="searchIcon"> <input type="image" src="/web/20140717053343im_/http://www.hcup-us.ahrq.gov/images/search-icon2.png" placeholder="Search" alt="search" class="search-icon" title="Search" width="10" height="11"> </td> </tr> </table> </form> </td> </tr> <tr> <td width="122" bgcolor="#66cccc"> </td> <td width="100%" colspan="2"><ul id="Menu1" class="MM"> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/"><br/>Home</a> <ul> <li><a class="NOLINK">What is HCUP?</a> <ul> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/overview.jsp">Overview of HCUP</a></li> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/overviewcourse.jsp">On-line HCUP Overview Course</a></li> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/tech_assist/faq.jsp">Frequently Asked Questions</a></li> </ul> </li> <li><a class="NOLINK">HCUP Products</a> <ul> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/databases.jsp">HCUP Databases</a></li> <li><a href="https://web.archive.org/web/20140717053343/http://hcupnet.ahrq.gov/" target="_blank">HCUPnet</a></li> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/tools_software.jsp">HCUP Tools & Software</a></li> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/reports.jsp">HCUP Reports</a></li> </ul> </li> <li><a class="NOLINK">HCUP Services</a> <ul> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/tech_assist/centdist.jsp">Purchase HCUP Data</a></li> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/techassist.jsp">HCUP Technical Assistance</a></li> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/tech_assist/tutorials.jsp">HCUP On-line Tutorials Series</a></li> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/tech_assist/dua.jsp">HCUP Data Use Agreement Training</a></li> </ul> </li> </ul> </li> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/databases.jsp"><br/>Databases</a> <ul> <li><a class="NOLINK"><strong>Nationwide HCUP Databases</strong></a></li> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/databases.jsp">National (Nationwide) Inpatient Sample (NIS)</a> <ul> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/nisoverview.jsp">Overview of the NIS</a> <ul> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/partners.jsp?NIS">HCUP Partners in the NIS</a></li> </ul> </li> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/tech_assist/centdist.jsp">Obtaining the NIS</a> <ul> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/tech_assist/dua.jsp">HCUP Data Use Agreement Training</a></li> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/team/NationwideDUA.jsp">Nationwide Data Use Agreement</a></li> </ul> </li> <li><a class="NOLINK">Using the NIS</a> <ul> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/db/nation/nis/nisdbdocumentation.jsp">NIS Database Documentation </a></li> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/db/nation/nis/nisrelatedreports.jsp">NIS Related Reports</a></li> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/db/publishing.jsp">Publishing with HCUP Data</a></li> </ul> </li> </ul> </li> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/databases.jsp">Kids' Inpatient Database (KID)</a> <ul> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/kidoverview.jsp">Overview of the KID</a> <ul> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/partners.jsp?KID">HCUP Partners in the KID</a></li> </ul> </li> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/tech_assist/centdist.jsp">Obtaining the KID</a> <ul> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/tech_assist/dua.jsp">HCUP Data Use Agreement Training</a></li> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/team/NationwideDUA.jsp">Nationwide Data Use Agreement</a></li> </ul> </li> <li><a class="NOLINK">Using the KID</a> <ul> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/db/nation/kid/kiddbdocumentation.jsp">KID Database Documentation</a></li> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/db/nation/kid/kidrelatedreports.jsp">KID Related Reports</a></li> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/db/publishing.jsp">Publishing with HCUP Data</a></li> </ul> </li> </ul> </li> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/databases.jsp">Nationwide Emergency Department Sample (NEDS)</a> <ul> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/nedsoverview.jsp">Overview of the NEDS</a> <ul> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/partners.jsp?NEDS">HCUP Partners in the NEDS</a></li> </ul> </li> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/tech_assist/centdist.jsp">Obtaining the NEDS</a> <ul> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/tech_assist/dua.jsp">HCUP Data Use Agreement Training</a></li> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/team/NationwideDUA.jsp">Nationwide Data Use Agreement</a></li> </ul> </li> <li><a class="NOLINK">Using the NEDS</a> <ul> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/db/nation/neds/nedsdbdocumentation.jsp">NEDS Database Documentation </a></li> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/db/nation/neds/nedsrelatedreports.jsp">NEDS Related Reports</a></li> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/db/publishing.jsp">Publishing with HCUP Data</a></li> </ul> </li> </ul> </li> <li><a class="NOLINK"><strong>State-Specific HCUP Databases</strong></a></li> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/databases.jsp">State Inpatient Databases (SID)</a> <ul> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/sidoverview.jsp">Overview of the SID</a> <ul> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/partners.jsp?SID">HCUP Partners in the SID</a></li> </ul> </li> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/tech_assist/centdist.jsp">Obtaining the SID</a> <ul> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/tech_assist/dua.jsp">HCUP Data Use Agreement Training</a></li> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/team/StateDUA.jsp">State Database Data Use Agreement</a></li> </ul> </li> <li><a class="NOLINK">Using the SID</a> <ul> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/db/state/siddbdocumentation.jsp">SID Database Documentation</a></li> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/db/state/sidrelatedreports.jsp">SID Related Reports</a></li> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/db/publishing.jsp">Publishing with HCUP Data</a></li> </ul> </li> </ul> </li> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/databases.jsp">State Ambulatory Surgery and Services Databases (SASD)</a> <ul> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/sasdoverview.jsp">Overview of the SASD</a> <ul> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/partners.jsp?SASD">HCUP Partners in the SASD</a></li> </ul> </li> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/tech_assist/centdist.jsp">Obtaining the SASD</a> <ul> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/tech_assist/dua.jsp">HCUP Data Use Agreement Training</a></li> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/team/StateDUA.jsp">State Database Data Use Agreement</a></li> </ul> </li> <li><a class="NOLINK">Using the SASD</a> <ul> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/db/state/sasddbdocumentation.jsp">SASD Database Documentation</a></li> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/db/state/sasdrelatedreports.jsp">SASD Related Reports</a></li> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/db/publishing.jsp">Publishing with HCUP Data</a></li> </ul> </li> </ul> </li> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/databases.jsp">State Emergency Department Databases (SEDD)</a> <ul> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/seddoverview.jsp">Overview of the SEDD</a> <ul> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/partners.jsp?SEDD">HCUP Partners in the SEDD</a></li> </ul> </li> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/tech_assist/centdist.jsp">Obtaining the SEDD</a> <ul> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/tech_assist/dua.jsp">HCUP Data Use Agreement Training</a></li> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/team/StateDUA.jsp">SEDD Data Use Agreement</a></li> </ul> </li> <li><a class="NOLINK">Using the SEDD</a> <ul> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/db/state/sedddbdocumentation.jsp">SEDD Database Documentation</a></li> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/db/state/seddrelatedreports.jsp">SEDD Related Reports</a></li> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/db/publishing.jsp">Publishing with HCUP Data</a></li> </ul> </li> </ul> </li> </ul> </li> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/tools_software.jsp">Tools &<br/>Software</a> <ul> <li><a class="NOLINK">Favorites</a> <ul> <li><a href="https://web.archive.org/web/20140717053343/http://hcupnet.ahrq.gov/" target="_blank">HCUPNet</a></li> <li><a href="https://web.archive.org/web/20140717053343/http://qualityindicators.ahrq.gov/" target="_blank">AHRQ Quality Indicators (QIs)</a></li> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/toolssoftware/monahrq/monahrq.jsp">MONAHRQ</a></li> </ul> </li> <li><a class="NOLINK">HCUP Tools & Software</a> <ul> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/toolssoftware/beta/icd_10_beta.jsp">ICD-10-CM/PCS Beta</a></li> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/toolssoftware/ccs/ccs.jsp">Clinical Classifications Software (CCS) for ICD-9-CM</a></li> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/toolssoftware/ccs_svcsproc/ccssvcproc.jsp">Clinical Classifications Software (CCS) for Services and Procedures</a></li> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/toolssoftware/icd_10/ccs_icd_10.jsp">Clinical Classifications Software (CCS) for ICD-10</a></li> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/toolssoftware/mhsa/mhsa.jsp">Clinical Classifications Software for Mental Health and Substance Abuse (CCS-MHSA)</a></li> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/toolssoftware/chronic/chronic.jsp">Chronic Condition Indicator</a></li> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/toolssoftware/comorbidity/comorbidity.jsp">Comorbidity Software</a></li> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/toolssoftware/procedure/procedure.jsp">Procedure Classes</a></li> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/toolssoftware/util_flags/utilflag.jsp">Utilization Flags</a></li> </ul> </li> <li><a class="NOLINK">HCUP Supplemental Files</a> <ul> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/db/state/costtocharge.jsp">Cost-to-Charge Ratio (CCR) Files</a></li> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/toolssoftware/hms/hms.jsp">Hospital Market Structure (HMS) Files</a></li> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/toolssoftware/revisit/revisit.jsp">HCUP Supplemental Variables for Revisit Analyses</a></li> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/db/state/ahalinkage/aha_linkage.jsp">American Hospital Association (AHA) Linkage Files</a></li> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/db/nation/nis/nisownership.jsp">NIS Hospital Ownership Files</a></li> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/db/nation/nis/nistrends.jsp">Nationwide Inpatient Sample Trends (NIS-Trends) Files</a></li> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/db/nation/kid/kidtrends.jsp">Kid’s Inpatient Database Trends (KID-Trends) File</a></li> </ul> </li> </ul> </li> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/reports.jsp"><br/>Reports</a> <ul> <li><a class="NOLINK"><strong>Favorites</strong></a></li> <li><a class="NOLINK">HCUP Statistical Briefs</a> <ul> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/reports/statbriefs/sbtopic.jsp">Topical list</a></li> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/reports/statbriefs/statbriefs.jsp">Chronological list </a></li> </ul> </li> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/reports/infographics.jsp">HCUP Infographics</a></li> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/reports/projections/projections_rpts.jsp">HCUP Projections</a></li> <li><a class="NOLINK"><strong>Information About Using HCUP Data</strong></a></li> <li><a class="NOLINK">HCUP Methods Series</a> <ul> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/reports/methods/methods_topic.jsp">Topical list</a></li> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/reports/methods/methods.jsp">Chronological list </a></li> </ul> </li> <li><a class="NOLINK">HCUP Nationwide Database Reports</a> <ul> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/db/nation/nis/nisrelatedreports.jsp">NIS </a></li> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/db/nation/kid/kidrelatedreports.jsp">KID </a></li> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/db/nation/neds/nedsrelatedreports.jsp">NEDS</a></li> </ul> </li> <li><a class="NOLINK">HCUP State Database Reports</a> <ul> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/db/state/sidrelatedreports.jsp">SID</a></li> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/db/state/sasdrelatedreports.jsp">SASD</a></li> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/db/state/seddrelatedreports.jsp">SEDD</a></li> </ul> </li> <li><a class="NOLINK"><strong>Additional Topics</strong></a></li> <li><a class="NOLINK">Topical Reports</a> <ul> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/reports/r_e_disparities.jsp">Race/Ethnicity </a></li> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/reports/mhsa.jsp">Mental and Substance Use Disorders </a></li> </ul> </li> <li><a class="NOLINK">HCUP Publications</a> <ul> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/reports/pubsearch/pubsearch.jsp">Publication search </a></li> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/reports/spotlights.jsp">Research Spotlights </a></li> <li><a href="https://web.archive.org/web/20140717053343/http://www.ahrq.gov/research/publications/">AHRQ Publications</a></li> </ul> </li> <li><a class="NOLINK">HCUP Archive</a> <ul> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/reports.jsp">Hospital Discharge Data report</a></li> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/reports/highlights.jsp">HCUP Highlights </a></li> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/reports/factbooks.jsp">HCUP Fact Books </a></li> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/reports/natstats.jsp">HCUP National Statistics Archive </a></li> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/reports/factsandfigures.jsp">HCUP Facts and Figures</a></li> 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</ul> </li> </ul> </li> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/techassist.jsp">Technical<br/>Assistance</a> <ul> <li><a class="NOLINK">Need Help?</a> <ul> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/tech_assist/faq.jsp">FAQs</a></li> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/databases.jsp">HCUP Databases</a></li> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/tech_assist/centdist.jsp">HCUP Central Distributor</a></li> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/db/publishing.jsp">HCUP Publishing Requirements</a></li> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/tech_assist/index_abc.jsp">HCUP Index</a></li> </ul> </li> <li><a class="NOLINK">HCUP Training & Tutorials</a> <ul> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/overviewcourse.jsp">HCUP Overview Course</a></li> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/tech_assist/dua.jsp">Data Use Agreement 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href="/web/20140717053343/http://www.hcup-us.ahrq.gov/datainnovations/clinicaldata/piprog.jsp">Projects in Progress</a></li> </ul> </li> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/datainnovations/clinicaldata/poatoolkit.jsp">Present on Admission Toolkit</a> <ul> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/datainnovations/clinicaldata/poaback.jsp">Background</a></li> <li><a class="NOLINK">Tools</a> <ul> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/datainnovations/clinicaldata/tktt.jsp">Training Tools</a></li> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/datainnovations/clinicaldata/tkds.jsp">Data Standards and Transmission Tools</a></li> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/datainnovations/clinicaldata/tkfeedback.jsp">Feedback and Reporting Tools</a></li> </ul> </li> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/datainnovations/clinicaldata/pilot.jsp">Pilot and Planning Projects</a></li> </ul> </li> </ul> </li> </ul> </td> </tr> <tr><td colspan="3"><a name="skip"></a></td></tr> </table> </div> <br> <table align="center" width="65%" class="pagetext" style="border: 2px solid #66cccc;" bordercolor="#000000"> <tr> <td rowspan="4" align="center"><img src="/web/20140717053343im_/http://www.hcup-us.ahrq.gov/images/Picture3.png" width="63" height="63" alt="yellow star" style=" vertical-align:middle;"><strong>New! 2012 NIS Redesign. For more details, refer to the <a href="https://web.archive.org/web/20140717053343/http://www.hcup-us.ahrq.gov/db/nation/nis/reports/NISRedesignFinalReport040914.pdf" target="_blank">NIS Redesign Report.</a></strong></td> </tr> </table> <br> <table width="100%" border="0" cellspacing="0" cellpadding="0"> <tr><td> </td></tr> <tr> <td width="100%" align="left" valign="top"><div class="texttitle">The National (Nationwide) Inpatient Sample (NIS)</div><br><div class="pagetext">The National (Nationwide) Inpatient Sample (NIS) is the largest all-payer inpatient care database in the United States, containing data on more than seven million hospital stays. Its large sample size is ideal for developing national and regional estimates and enables analyses of rare conditions, uncommon treatments, and special populations. The following links provide detailed documentation for the NIS. </div> </td> </tr> <tr><td> </td></tr> </table> <table width="100%" border="0" cellspacing="2" cellpadding="4"> <tr> <td width="50%" valign="top" class="pagetext"> <strong>Description of NIS Files</strong>  <ul> <li>Introduction to the NIS</li> <ul> <li>2012 (<a href="NISIntroduction2012.pdf" target="_blank">PDF</a> file, 624 KB)</li> <li><a href="nisarchive.jsp">Prior Years</a></li> </ul> <li>HCUP Quality Control Procedures (<a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/db/quality.pdf" target="_blank">PDF</a> file, 126 KB) </li> <li><a href="nisfilespecs.jsp">File Specifications</a></li> <li><a href="trendwghts.jsp">New NIS Trend Weights</a></li> </ul> <strong>Restrictions on the Use of the NIS</strong> <ul> <li>Data Use Agreement for the National (Nationwide) Databases (<a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/team/HCUP_Nationwide_DUA_051614.pdf" target="_blank">PDF</a> file, 55 KB; <a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/team/NationwideDUA.jsp">HTML</a>)</li> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/db/publishing.jsp">Requirements for Publishing with HCUP Data</a></li> <li><a href="nisarchive.jsp">Sources of NIS Data and State-Specific Restrictions for Prior Years</a></li> </ul> <strong>Load Programs</strong> <ul> <li><a href="nissasloadprog.jsp">SAS Load Programs</a></li> <li><a href="nisspssloadprog.jsp">SPSS Load Programs</a></li> <li><a href="nisstataloadprog.jsp">Stata Load Programs</a></li> </ul> <strong>NIS Data Elements</strong> <ul> <li><a href="nisdde.jsp">Description of Data Elements</a></li> <li><a href="NISvariables1998-2012forHCUP-US.pdf" target="_blank">Availability of Data Elements by Year</a> (PDF file, 68 KB)</li> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/maps/aha.jsp">Availability of AHA Hospital Identifiers across States and Years</a></li> </ul> <strong>Additional Resources for NIS Data Elements</strong> <ul> <li><a href="nissummstats.jsp">Summary Statistics</a></li> <li>NIS Severity Measures <ul> <li>Overview of Severity Measures (<a href="OverviewofSeveritySystems.pdf" target="_blank">PDF</a> file, 60 KB; <a href="severity_overview.jsp">HTML</a>)</li> <li><a href="grp031_aprdrg_meth_ovrview.pdf" target="_blank">APR-DRGs Methodology Overview Version 31</a> (PDF file, 341 KB)</li> <li><a href="nisarchive.jsp">Prior Years</a></li> </ul> <li>HCUP Coding Practices (<a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/db/coding.pdf" target="_blank">PDF</a> file, 16 KB; <a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/db/coding.jsp">HTML</a>) </li> <li>HCUP Hospital Identifiers (<a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/db/maphosp.pdf" target="_blank">PDF</a> file, 82 KB; <a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/db/maphosp.jsp">HTML</a>) </li> </ul> </td> <td width="5%"> </td> <td width="50%" valign="top" class="pagetext"> <strong>Known Data Issues</strong> <ul> <li><a href="corrections_2000.jsp">2000</a></li> <li><a href="corrections_1998_1999.jsp">1998-1999</a></li> <li><a href="corrections_1994_1997.jsp">1994-1997</a></li> <li><a href="corrections_1993.jsp">1993</a></li> <li><a href="corrections_1988_1992.jsp">1988-1992</a></li> <li>For NIS data 2011 and earlier, revised weights should be used to make estimates comparable to later data. Refer to the <a href="trendwghts.jsp">NIS Trends Weights Files</a>.</li> </ul> <strong>HCUP Tools: Labels and Formats</strong> <ul> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/toolssoftware/ccs/ccs.jsp">Clinical Classifications Software (CCS)</a></li> <li>Format Programs</li> <ul> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/db/tools/DRG_Formats.TXT" target="_blank">DRG Formats Program</a> (TXT file, 1.3 MB) <em>Creates SAS formats to label the values of each DRG and MDC category</em></li>  <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/db/tools/HCUP_Formats.txt" target="_blank">HCUP Formats Program</a> (TXT file, 67 KB) <em>Creates SAS formats to label the values of selected categorical data elements in HCUP files</em></li>  <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/db/tools/Dx_Pr_Grps_Formats.txt" target="_blank">HCUP Diagnosis and Procedure Groups Formats Program</a> (TXT file, 45 KB) <em> Creates SAS formats to label the values of HCUP Diagnosis and Procedure Groups data elements, including Clinical Classifications Software (CCS) data elements</em></li>  <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/db/tools/I9_Formats.TXT" target="_blank">ICD-9-CM Formats Program</a> (TXT file, 910 KB) <em>Creates SAS formats to label the values of ICD-9-CM Diagnoses and Procedures</em></li>  <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/db/tools/Severity_Formats.txt" target="_blank">Severity Formats Program</a> (TXT file, 685 KB) <em>Creates SAS formats to label the values of data elements in HCUP Severity Files</em></li>  </ul> </ul> <strong>NIS Related Reports and Supplemental Files</strong> <ul> <li><a href="nisrelatedreports.jsp">NIS Related Reports</a></li> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/db/state/costtocharge.jsp">Cost-to-Charge Ratio Files</a></li>  <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/toolssoftware/hms/hms.jsp">Hospital Market Structure (HMS) Files </a></li>  <li><a href="nistrends.jsp">NIS Trends Supplemental Files</a></li> <li><a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/db/nation/nis/nisownership.jsp">NIS Hospital Ownership Files</a></li> </ul> </td> </tr> </table> <hr width="75%" align="center" class="hrruleblue"> <table width="100%"> <tr> <td align="center" class="citationtext"> Internet Citation: HCUP NIS Database Documentation. Healthcare Cost and Utilization Project (HCUP). June 2014. Agency for Healthcare Research and Quality, Rockville, MD. www.hcup-us.ahrq.gov/db/nation/nis/nisdbdocumentation.jsp. </td> </tr> <tr> <td align="center" class="citationtext"> <a href="/web/20140717053343/http://www.hcup-us.ahrq.gov/viewing_prntg.jsp">Are you having problems viewing or printing pages on this Website?</a> </td> </tr> <tr> <td align="center" class="citationtext"> If you have comments, suggestions, and/or questions, please contact <a href="https://web.archive.org/web/20140717053343/mailto:hcup@ahrq.gov">hcup@ahrq.gov.</a> </td> </tr> <tr> <td align="center" class="citationtext"> <a href="https://web.archive.org/web/20140717053343/http://www.ahrq.gov/policy/electronic/privacy/index.html" target="_blank">Privacy Notice</a>, <a href="https://web.archive.org/web/20140717053343/http://www.hhs.gov/plugins.html" target="_blank">Viewers & Players</a> </td> </tr> <tr> <td align="center" class="citationtext">Last modified 6/27/14</td> </tr> </table> </body> </html>

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