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hcup-us.ahrq.gov/reports/statbriefs/sb304-readmissions-2016-2020.pdf
January 01, 2020 - Characteristics of 30-Day All-Cause Hospital Readmissions, 2016–2020
1
STATISTICAL BRIEF #304
September 2023
H. Joanna Jiang, Ph.D., and Molly Hensche, M.S.
Introduction
Hospital readmissions are one of the key measures used for
evaluating the quality of inpatient care and post-discharge
outpatient care. A…
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hcup-us.ahrq.gov/db/nation/nis/tools/stats/1993RECL_C.txt
March 18, 1996 - 1 ADAYWK 1 2 Num I:Admission day of week
2 AMONTH 3 4 Num I:Admission month
3 DSNDX 5 6 Num I:Max number of diagnoses from source
4 DSNPR 7 8 Num I:Max number of procedures from source
5 DSNUM 9 10 Num I:Data source ID number
6 DSTYPE 11 11 Num I:Data so…
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hcup-us.ahrq.gov/db/nation/kid/tools/stats/KID_1997_CORE.txt
January 01, 1997 - 18 20 Num I:Age in days (when < 1 year)
KID 1997 CORE 6 AGEMONTH 21 23 Num I:Age in months
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hcup-us.ahrq.gov/db/nation/nis/tools/stats/1997RECL_C.txt
November 12, 1999 - 1 ADAYWK 1 2 Num I:Admission day of week
2 AMONTH 3 4 Num I:Admission month
3 DSNDX 5 6 Num I:Max number of diagnoses from source
4 DSNPR 7 8 Num I:Max number of procedures from source
5 DSNUM 9 10 Num I:Data source ID number
6 DSTYPE 11 11 Num I:Data so…
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hcup-us.ahrq.gov/db/nation/nis/tools/stats/1994RECL_C.txt
December 06, 1996 - 1 ADAYWK 1 2 Num I:Admission day of week
2 AMONTH 3 4 Num I:Admission month
3 DSNDX 5 6 Num I:Max number of diagnoses from source
4 DSNPR 7 8 Num I:Max number of procedures from source
5 DSNUM 9 10 Num I:Data source ID number
6 DSTYPE 11 11 Num I:Data so…
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hcup-us.ahrq.gov/db/nation/nis/tools/stats/1996RECL_C.txt
February 13, 1998 - 1 ADAYWK 1 2 Num I:Admission day of week
2 AMONTH 3 4 Num I:Admission month
3 DSNDX 5 6 Num I:Max number of diagnoses from source
4 DSNPR 7 8 Num I:Max number of procedures from source
5 DSNUM 9 10 Num I:Data source ID number
6 DSTYPE 11 11 Num I:Data so…
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hcup-us.ahrq.gov/db/nation/nis/tools/stats/1995RECL_C.txt
February 13, 1998 - 1 ADAYWK 1 2 Num I:Admission day of week
2 AMONTH 3 4 Num I:Admission month
3 DSNDX 5 6 Num I:Max number of diagnoses from source
4 DSNPR 7 8 Num I:Max number of procedures from source
5 DSNUM 9 10 Num I:Data source ID number
6 DSTYPE 11 11 Num I:Data so…
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hcup-us.ahrq.gov/reports/methods/2011_06.pdf
January 01, 2011 - bacterial gastroenteritis, and transfers from other institutions) per 100,000 population, ages 3 months … an
immunocompromised state, and transfers from other institutions) per 100,000 population, ages 3
months … as a Percent of the
Population) + 12.09%
Percent of People Below the Poverty Line in the Past 12
Months … a Percent of the
Population) ns 8.41%
Percent of People Below the Poverty Line in the Past 12
Months … Month + 13.57%
HMO Penetration ns 2.65%
Percent of People Below the Poverty Line in the Past 12
Months
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hcup-us.ahrq.gov/reports/methods/2010_06.pdf
January 01, 2010 - or
bacterial gastroenteritis, and transfers from other institutions) per 100,000 population, ages 3 months … an
immunocompromised state, and transfers from other institutions) per 100,000 population, ages 3
months … as a Percent of the
Population) + 12.09%
Percent of People Below the Poverty Line in the Past 12
Months … a Percent of the
Population) ns 8.41%
Percent of People Below the Poverty Line in the Past 12
Months … Month + 13.57%
HMO Penetration ns 2.65%
Percent of People Below the Poverty Line in the Past 12
Months
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hcup-us.ahrq.gov/reports/statbriefs/sb269-Influenza-ED-Visits-2016-2018.pdf
January 01, 2018 - numerator and denominator for each season were summed together.
2016–2017
• Numerator used 5 months … of HCUP data from August 2016 to December 2016 and 7 months of
data from January 2017 to July 2017 … populations for 2016 and 7/12 of the State populations for
2017
15
2017–2018
• Numerator used 5 months … of HCUP data from August 2017 to December 2017 and 7 months of
data from January 2018 to July 2018
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hcup-us.ahrq.gov/reports/statbriefs/sb147.jsp
January 01, 2013 - In both years, influenza activity was at its lowest in the late spring and summer months (April to August
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hcup-us.ahrq.gov/reports/trendtables/summarytrendtables.jsp
May 01, 2025 - HCUP Summary Trend Tables
An official website of the Department of Health & Human Services
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hcup-us.ahrq.gov/reports/methods/2007_02.pdf
January 01, 2007 - KID trends can be estimated in years (discharge year), quarters (discharge
quarter), or months (admission … If the analysis is concerned with seasonality, then time
should be measured in quarters or months. … coded 0-365 only when the age in years is
less than 1 year
Yes Yes Yes AGEDAY
AGEMONTH Core Age in months
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hcup-us.ahrq.gov/reports/statbriefs/sb284-COVID-19-Age18to64Hosptl.pdf
December 01, 2020 - in-hospital deaths increased 44
percent to about 1,300 in April–
June 2020 compared with the
same months … Hispanic
patients aged 18–64 years more
than doubled in April–September
2020 compared with the same
months … largest increase in in-hospital
deaths (55 percent) in April–
September 2020 compared with
the same months
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hcup-us.ahrq.gov/datainnovations/2015HCUPStateDatabases04072017.pdf
April 07, 2017 - introduction of ICD-10 on
October 1 means that the 2015 databases include a combination of codes:
Nine months … of the data with ICD-9-CM codes (Jan 1, 2015 to September 30, 2015)
Three months of data with ICD
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hcup-us.ahrq.gov/db/nation/nis/NIS_Introduction_2021.jsp
January 01, 2021 - On October 1, 2015, hospital administrative data began using ICD-10-CM/PCS, so the first nine months … of 2015 contain ICD-9-CM codes and the last three months contain ICD-10-CM/PCS codes. … Nine months of the 2015
data with ICD-9-CM codes (discharges from January 1, 2015 - September
30 … Three months of 2015
data with ICD-10-CM/PCS codes (discharges from October 1, 2015 -
December … For example, when a hospital
contributed only six months of discharge data to HCUP, the
adjusted
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hcup-us.ahrq.gov/db/nation/nis/NIS_Introduction_2020.jsp
January 01, 2020 - CODES
On October 1, 2015, hospital administrative data began using ICD-10-CM/PCS, so the first nine months … of 2015 contain ICD-9-CM codes and the last three months contain ICD-10-CM/PCS codes. … Nine months of the 2015 data with ICD-9-CM codes (discharges from January 1, 2015 - September 30, 2015 … Three months of 2015 data with ICD-10-CM/PCS codes (discharges from October 1, 2015 - December 31, 2015 … For example, when a hospital contributed only six months of discharge data to HCUP, the adjusted number
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hcup-us.ahrq.gov/db/state/sedddist/sedddist_filecompmd.jsp
August 01, 2006 - close during the year; others have technical problems that prevent them from reporting data for all months
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hcup-us.ahrq.gov/db/nation/neds/stats/FileSpecifications_NEDS_2015_Core.TXT
January 01, 2015 - Data Set Name: NEDS_2015_CORE
Number of Observations: 30542691
Total Number of Data Elements: 19
Columns Description
======== ===========
1 - 4 Database name
6 - 9 Discharge year of data
11 - 19 File name
21 - 23 Data element number
25 - 43 Data element name
45 …
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hcup-us.ahrq.gov/reports/statbriefs/sb272-COVID19-Hospitalizations.pdf
December 01, 2020 - Differences in hospitalizations by
race/ethnicity in April, May, and June 2020 are compared with the
same months … the race/ethnicity distribution of COVID-19-related hospitalizations in nine States in
each of three months