-
hcup-us.ahrq.gov/db/nation/nrd/stats/FileSpecifications_NRD_2013_Hospital.TXT
January 01, 2013 - 12
Columns Description
======== ===========
1 - 4 Database name
6 - 9 Discharge year … 2013 Hospital 11 TOTAL_DISC 6 Num Total hospital discharges
NRD 2013 Hospital 12 YEAR … 4 Num Calendar year
-
hcup-us.ahrq.gov/db/nation/nrd/stats/FileSpecifications_NRD_2017_Hospital.TXT
January 01, 2017 - 12
Columns Description
======== ===========
1 - 3 Database name
5 - 8 Discharge year … TOTAL_DISC 6 Num Total hospital discharges
NRD 2017 NRD_2017_Hospital 12 YEAR … 4 Num Calendar year
-
hcup-us.ahrq.gov/db/nation/nrd/stats/FileSpecifications_NRD_2014_Hospital.TXT
January 01, 2014 - 12
Columns Description
======== ===========
1 - 4 Database name
6 - 9 Discharge year … 2014 Hospital 11 TOTAL_DISC 6 Num Total hospital discharges
NRD 2014 Hospital 12 YEAR … 4 Num Calendar year
-
hcup-us.ahrq.gov/db/nation/nrd/stats/FileSpecifications_NRD_2019_Hospital_V2.TXT
January 01, 2019 - Columns Description
======== ===========
1 - 3 Database name
5 - 8 Discharge year … TOTAL_DISC 6 Num Total hospital discharges
NRD 2019 NRD_2019_Hospital 12 YEAR … 4 Num Calendar year
-
hcup-us.ahrq.gov/db/nation/nrd/stats/FileSpecifications_NRD_2015_Hospital.TXT
January 01, 2015 - 12
Columns Description
======== ===========
1 - 3 Database name
5 - 8 Discharge year … TOTAL_DISC 6 Num Total hospital discharges
NRD 2015 NRD_2015_Hospital 12 YEAR … 4 Num Calendar year
-
hcup-us.ahrq.gov/db/nation/nrd/stats/FileSpecifications_NRD_2011_Hospital_V2.TXT
January 01, 2011 - 12
Columns Description
======== ===========
1 - 4 Database name
6 - 9 Discharge year … Hospital_V2 11 TOTAL_DISC 6 Num Total hospital discharges
NRD 2011 Hospital_V2 12 YEAR … 4 Num Calendar year
-
hcup-us.ahrq.gov/db/nation/nis/NIS_1999_HOSPITAL.pdf
January 01, 1999 - - Calendar year
The discharge year (YEAR) is always coded. … In the 1988-1997 HCUP databases, YEAR is two-digits (e.g., if
the discharge year is 1990, then YEAR … Beginning in the 1998 HCUP databases, YEAR is four-digits
(e.g., 1998). … None
General Notes
Uniform Values
Variable Description Value Value Description
YEAR Calendar year … 2-digit
calendar year
in 1988-1997
data
yy
4-digit
calendar year
beginning with
1998 data
yyyy
-
hcup-us.ahrq.gov/db/nation/neds/stats/FileSpecifications_NEDS_2007v2_Hospital.TXT
April 12, 2010 - 15
Columns Description
======== ===========
1 - 4 Database name
6 - 9 Discharge year … Num Total number of ED visits from this hospital in the NEDS
NEDS 2007 Hospital 15 YEAR … Num Calendar Year
-
hcup-us.ahrq.gov/db/nation/neds/stats/FileSpecifications_NEDS_2006_Hospital.TXT
January 01, 2006 - 15
Columns Description
======== ===========
1 - 4 Database name
6 - 9 Discharge year … Num Total number of ED visits from this hospital in the NEDS
NEDS 2006 Hospital 15 YEAR … Num Calendar Year
-
hcup-us.ahrq.gov/db/nation/neds/stats/FileSpecifications_NEDS_2007_Hospital.TXT
January 01, 2007 - 15
Columns Description
======== ===========
1 - 4 Database name
6 - 9 Discharge year … Num Total number of ED visits from this hospital in the NEDS
NEDS 2007 Hospital 15 YEAR … Num Calendar Year
-
hcup-us.ahrq.gov/db/nation/neds/stats/FileSpecifications_NEDS_2006v2_Hospital.TXT
April 12, 2010 - 15
Columns Description
======== ===========
1 - 4 Database name
6 - 9 Discharge year … Num Total number of ED visits from this hospital in the NEDS
NEDS 2006 Hospital 15 YEAR … Num Calendar Year
-
hcup-us.ahrq.gov/db/nation/nis/DataElements_NIS_2000_HOSPITAL.pdf
January 01, 2000 - - Calendar year .................................................................................... … - Calendar year
General Notes
The discharge year (YEAR) is always coded. … In the 1988-1997 HCUP databases,
YEAR is two-digits (e.g., if the discharge year is 1990, then YEAR … Uniform Values
Variable Description Value Value Description
yy 2-digit calendar year in 1988-1997 … dataYEAR Calendar year
yyyy 4-digit calendar year beginning with
1998 data
State Specific Notes
-
hcup-us.ahrq.gov/db/nation/nis/tools/stats/FileSpecifications_NIS_2020_Hospital_V2.TXT
January 01, 2020 - Columns Description
======= ===========
1- 3 Database name
5- 8 Discharge year of data … Total number of discharges from this hospital in the NIS
NIS 2020 NIS_2020_Hospital 14 YEAR … 61 64 Num Calendar year
-
hcup-us.ahrq.gov/db/nation/nis/tools/stats/FileSpecifications_NIS_2022_Hospital.TXT
January 01, 2022 - Columns Description
======= ===========
1- 3 Database name
5- 8 Discharge year of data … Total number of discharges from this hospital in the NIS
NIS 2022 NIS_2022_Hospital 14 YEAR … 61 64 Num Calendar year
-
hcup-us.ahrq.gov/db/nation/nis/tools/stats/FileSpecifications_NIS_2021_Hospital.TXT
January 01, 2021 - Columns Description
======= ===========
1- 3 Database name
5- 8 Discharge year of data … Total number of discharges from this hospital in the NIS
NIS 2021 NIS_2021_Hospital 14 YEAR … 61 64 Num Calendar year
-
hcup-us.ahrq.gov/db/nation/nis/NIS_1998_Hospital.pdf
January 01, 1998 - - Calendar year
The discharge year (YEAR) is always coded. … In the 1988-1997 HCUP databases, YEAR is two-digits (e.g., if
the discharge year is 1990, then YEAR … Beginning in the 1998 HCUP databases, YEAR is four-digits
(e.g., 1998). … None
General Notes
Uniform Values
Variable Description Value Value Description
YEAR Calendar year … 2-digit
calendar year
in 1988-1997
data
yy
4-digit
calendar year
beginning with
1998 data
yyyy
-
hcup-us.ahrq.gov/nrdoverview.jsp
September 01, 2025 - THE NRD CONTAINS A FULL YEAR OF ICD-10-CM/PCS CODES BEGINNING WITH DATA YEAR 2016
The NRD includes … a full calendar year of data with diagnosis and procedure codes reported using the ICD-10-CM/PCS 1 … coding system beginning with data year 2016. … Criteria to determine the relationship between multiple hospital admissions for an individual patient in a calendar … Return to Contents
NRD File Structure
The 2022 NRD is an annual, calendar-year file that
-
hcup-us.ahrq.gov/db/nation/neds/pgms/StataLoad_NEDS_2006v2_Hospital.Do
April 12, 2010 - ///
EDVISITS ///
YEAR … var edvisits "Total number of ED visits from this hospital in the NEDS"
label var year … "Calendar Year"
*** Convert special values to missing values ***
recode discwt … recode year (-999 -888 -666=.)
save "NEDS_2006_Hospital.dta", replace
-
hcup-us.ahrq.gov/db/nation/neds/pgms/StataLoad_NEDS_2006_Hospital.Do
January 01, 2006 - ///
EDVISITS ///
YEAR … var edvisits "Total number of ED visits from this hospital in the NEDS"
label var year … "Calendar Year"
*** Convert special values to missing values ***
recode discwt … recode year (-999 -888 -666=.)
save "NEDS_2006_Hospital.dta", replace
-
hcup-us.ahrq.gov/db/nation/neds/pgms/StataLoad_NEDS_2007v2_Hospital.Do
April 12, 2010 - ///
EDVISITS ///
YEAR … var edvisits "Total number of ED visits from this hospital in the NEDS"
label var year … "Calendar Year"
*** Convert special values to missing values ***
recode discwt … recode year (-999 -888 -666=.)
save "NEDS_2007_Hospital.dta", replace