Respective tool(s) from the Research Tools section of the HCUP User Support (HCUP-US) website. Users interested in applying AHRQ software tools to the NIS for data years including ICD-10-CM/PCS-codedĭata to produce data elements currently unavailable in the database files may do so by downloading the Hospital File is a single file containing information on hospital characteristics.Beginning with data year 2019, data elements derived from the Elixhauser Comorbidity Software Refined for ICD-10-CM, the CCSR for ICD-10-PCS procedures, and Procedure Classes Refined for ICD-10-CM are also available in this file.Beginning with data year 2018, this file is available in the NIS and includes data elements derived from the Clinical Classifications Software Refined (CCSR) for ICD-10-CM diagnoses.Data elements derived from the ICD-10-CM/PCS AHRQ software tools were not included in the NIS because they were still in development and testing. For data years 2016-2017, this file was not available in the NIS.Diagnosis and Procedure Groups File is a single file containing additional information on the ICD-10-CM diagnoses and ICD-10-PCS procedures that is created by the Agency for Healthcare Research and Quality (AHRQ) software tools.Severity File is a single file containing additional data elements to aid in identifying the severity of the condition for a specific discharge.Core File is a single file containing commonly used data elements (e.g., age, expected primary payer, ICD-10-CM/PCS codes, total charges).There are three discharge-level files and one hospital-level Other than data year 2015, which was split into two parts because of the switch from ICD-9-CM to ICD-10-CM/PCSĬoding, the NIS is an annual, calendar year file. The HCUP Methods Series Report #2015-01 provides guidance on alternative approaches to handling missing data in the NIS. Users are advised to review frequencies for all data elements planned for use in their analysis and to consider analytic methods for dealing with missing data. Not all data elements are available each year.įor certain data elements such as, but not limited to, patient race (RACE) and total charges (TOTCHG), more than one percent of NIS records have missing values.Not all data elements in the NIS are available from every State.Please check the "State Specific Notes" section for each data element before analysis. Not all data elements in the NIS are uniformly coded across States.The descriptions are cumulative across all years of NIS data from 1988 to the current data year. Record layouts for the NIS files are available under File Specifications.ĭata element descriptions explain how the data element is coded in the HCUP databases and what are the uniform values. The following links provide data elements descriptions for the National (Nationwide) Inpatient Sample (NIS).
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