HEALTHCARE COST AND UTLIZATION PROJECT – HCUP
A FEDERAL-STATE-INDUSTRY PARTNERSHIP IN HEALTH DATA
Sponsored by the Agency for Healthcare Research and Quality
INTRODUCTION TO
THE HCUP STATE INPATIENT DATABASES (SID)
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These pages provide only an introduction to the SID package.
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Issued June 15, 2022
Agency for Healthcare Research and Quality
Healthcare Cost and Utilization Project (HCUP)
5600 Fishers Lane
Mail Stop 7W25B
Rockville, MD 20857
SASD Data and Documentation Distributed through the
HCUP Central Distributor
Website: www.hcup-us.ahrq.gov
Phone: (866) 290-4287 (toll free)
Email: HCUP@AHRQ.gov
Table of Contents
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HCUP STATE INPATIENT DATABASES (SID)
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***** REMINDER ***** |
All users of the SID must take the online Data Use Agreement (DUA) training course, and read and sign a Data Use Agreement. Details and links may be found on the following page. Authorized users of HCUP data agree to the following restrictions:a
Any violation of the limitations in the data use agreement is punishable under Federal law by a fine, up to five years in prison, or both. Violations may also be subject to penalties under State statutes. |
a This is a summary of key terms of the Data Use Agreement for HCUP State Databases, please refer to the DUA for full terms and conditions. |
HCUP DATA USE AGREEMENT REQUIREMENTS
All HCUP data users, including data purchasers and collaborators, must complete the online HCUP Data Use Agreement (DUA) Training Tool, and read and sign the HCUP Data Use Agreement. Proof of training completion and signed Data Use Agreements must be submitted to the HCUP Central Distributor.
Data purchasers will be required to provide their DUA training completion code and will execute their DUAs electronically as a part of the online ordering process. The DUAs and training certificates for collaborators and others with access to HCUP data should be submitted directly to the HCUP Central Distributor using the contact information below.
The on-line DUA training course is available at: www.hcup-us.ahrq.gov/tech_assist/dua.jsp.
The HCUP Data Use Agreement for the State Databases is available on the HCUP User Support (HCUP-US) website.
HCUP CONTACT INFORMATION
HCUP Central Distributor and HCUP User Support
Information about the content of the HCUP databases is available on the HCUP User Support (HCUP-US) website (www.hcup-us.ahrq.gov).
If you have questions please review the HCUP Frequently Asked Questions located at www.hcup-us.ahrq.gov/tech_assist/faq.jsp.
If you need further technical assistance, please contact the HCUP Central Distributor and User Support team at:
Phone: 866-290-4287 (toll free)
Email: HCUP@AHRQ.gov
Mailing address:
HCUP Central Distributor
c/o IBM
5425 Hollister Avenue, Suite 140
Santa Barbara, CA 93111
We would like to receive your feedback on the HCUP data products.
Please send user feedback to hcup@ahrq.gov
HEALTHCARE COST AND UTILIZATION PROJECT — HCUP
A FEDERAL-STATE-INDUSTRY PARTNERSHIP IN HEALTH DATA
Sponsored by the Agency for Healthcare Research and Quality
The Agency for Healthcare Research and Quality and
the staff of the Healthcare Cost and Utilization Project (HCUP) thank you for
your interest in the HCUP State Inpatient Databases (SID)
HCUP State Inpatient Databases (SID)
ABSTRACT
The State Inpatient Databases (SID) are part of the Healthcare Cost and Utilization Project (HCUP), sponsored by the Agency for Healthcare Research and Quality (AHRQ).
The HCUP State Inpatient Databases (SID) are a powerful set of hospital databases from data organizations in participating States.
Researchers and policymakers use SID to investigate questions unique to one State; to compare data from two or more States; to conduct market-area variation analyses; and to identify State-specific trends in inpatient care utilization, access, charges, and outcomes.
The individual State databases are in the same HCUP uniform format and represent 100 percent of records processed by AHRQ. However, the participating data organizations control the release of specific data elements. AHRQ is currently assisting the data organizations in the release of the 1990-2021 SID.
The SID can be linked to hospital-level data from the American Hospital Association's Annual Survey of Hospitals and county-level data from the Bureau of Health Professions' Area Resource File, except in those States that do not allow the release of hospital identifiers.
Thirty-six of the data organizations participating in the HCUP have agreed to release their SID files through the HCUP Central Distributor under the auspices of the AHRQ. Uses are limited to research and aggregate statisitical reporting.
INTRODUCTION TO THE HCUP STATE INPATIENT DATABASES (SID)
OVERVIEW OF THE SID
The Healthcare Cost and Utilization Project (HCUP) State Inpatient Databases (SID) consist of individual data files from data organizations in 49 participating data organizations. In general, the SID contain the universe of that State's hospital inpatient discharge records. They are composed of annual, State-specific files that share a common structure and common data elements. Most data elements are coded in a uniform format across all States. In addition to the core set of uniform data elements, the SID include State-specific data elements or data elements available only for a limited number of States. The uniform format of the SID helps facilitate cross-State comparisons. In addition, the SID are well suited for research that requires complete enumeration of hospitals and discharges within market areas or States.
Thirty-six of the 49 data organizations that participate in the HCUP have agreed to release their State-specific files through the HCUP Central Distributor under the auspices of AHRQ. The individual state databases are in the same HCUP uniform format and represent 100 percent of records processed by AHRQ. However, the participating data organizations control the release of specific data elements.
SID data sets are currently available for multiple States and years. Each release of the SID includes:
The SID are calendar year files for all data years except 2015. Because of the transition to ICD-10-CM/PCS1 on October 1, 2015, the 2015 SID are split into two parts. Nine months of the 2015 data with ICD-9-CM2 codes (discharges from January 1, 2015 - September 30, 2015) are in one set of files labeled Q1Q3. Three months of 2015 data with ICD-10-CM/PCS codes (discharges from October 1, 2015 - December 31, 2015) are in a separate set of files labeled Q4. More information about the changes to the HCUP databases for ICD-10-CM/PCS and use of data across the two coding system may be found on the HCUP User Support website under ICD-10-CM/PCS Resources (www.hcup-us.ahrq.gov/datainnovations/icd10_resources.jsp).
SID documentation and tools—including file specifications, programming source code for loading ASCII data into SAS (SAS Institute Inc.; Cary, NC), SPSS (IBM Corp.; Somers, NY), and Stata (StataCorp; College Station, TX), and value labels—are available online at the HCUP User Support website (www.hcup-us.ahrq.gov).
Starting with the 2006 SID, the AHA Linkage files are available via the HCUP User Support website www.hcup-us.ahrq.gov. The AHA Linkage files may not be available when the discharge-level database is released.
How the HCUP SID Differ from State Data Files
The SID available through the HCUP Central Distributor differ from the data files available from the data organizations in the following ways:
Because the data organizations dictate the data elements that may be released through the HCUP Central Distributor, the data elements on the SID are a subset of the data collected by the corresponding data organizations. HCUP uniform coding is used on most data elements on the SID. A few State-specific data elements retain the original values provided by the respective data organizations.
What Types of Hospitals Are Included in the SID?
The types of hospitals included in the SID depend on the information provided by the data organizations and how the files were handled during HCUP processing. Most State government data organizations provide information on all acute care hospitals in the respective State. Private data organizations are often restricted to member hospitals and may not provide information on all hospitals in their State.
Beginning with the 1994 SID, all hospitals reported by the data organizations were retained in the SID files. Discharges from facilities such as psychiatric facilities, alcohol and drug dependency facilities, and State, Federal, and Veterans Affairs hospitals will be in the SID, if reported by the data source. Prior to 1994, only discharges from community hospitals were retained in the SID.
Community hospitals, as defined by the AHA, include "all nonfederal, short term, general and other specialty hospitals, excluding hospital units of institutions." Included among community hospitals are academic medical centers and specialty hospitals such as obstetrics, gynecology, otolaryngology, short term rehabilitation, orthopedic, and pediatric hospitals. Noncommunity hospitals include Federal hospitals (e.g., Veterans Affairs, Department of Defense, and Indian Health Service hospitals), long-term hospitals, psychiatric hospitals, alcohol/chemical dependency treatment facilities, and hospital units within institutions such as prisons.
Some community hospitals may not be included in the SID because their data were not provided by the data source. To identify community hospitals, the SID must be linked to the AHA Annual Survey of Hospitals by the AHA hospital identifier.
Tables showing the number of hospitals in the SID can be found online at the HCUP User Support website: (www.hcup-us.ahrq.gov). The tables present the hospitals by the number of hospitals of:
Information contained in the AHA Annual Survey of Hospitals was used to determine if a hospital was a community hospital. Some hospitals could not be categorized as community or noncommunity hospitals because they could not be matched with AHA information. This occurs when a hospital was closed in a previous year or when the hospital does not report to the AHA.
How to Identify Hospitals in the SID
Up to three hospital identifiers are on the SID:
What is the File Structure of the SID in the 2019-2021 Files?
Based on the availability of data elements across States, data elements included in the 2019-2021 SID are structured as follows:
The Core file is a discharge-level file that contains:
Core data elements meet at least one of the following criteria:
State-specific data elements meet at least one of the following criteria:
The Charges file contains detailed charge information. There are three kinds of Charges files:
For example, if a patient had five laboratory tests, REVCD1 would include the revenue code for laboratory, CHG1 would include the total charge for the five tests, and UNIT1 would be five. To combine data elements between this type of Charges file and the Core file, merge the files by the unique record identifier (KEY). There will be a one-to-one correspondence of records.
For example, if a patient had five laboratory tests, there are five records in the Charges file with information on the charge for each laboratory test. Information from this type of Charges file may be combined with the Core file by the unique record identifier (KEY), but there is not a one-to-one correspondence of records.
Refer to the Description of Data Elements online at the HCUP User Support website (www.hcup-us.ahrq.gov) for more information on the charge information from the different States.
The AHA Linkage file contains AHA linkage data elements that allow the SID to be used in conjunction with the AHA Annual Survey of Hospitals data files. These files contain information about hospital characteristics and are available for purchase through the AHA. Because the data organizations in participating States determine whether the AHA linkage data elements may be released through the HCUP Central Distributor with the SID, not all SID include AHA linkage data elements.
The AHA Linkage file is a hospital-level file with one observation per hospital or facility. To combine the discharge-level files with the hospital-level file (AHA Linkage file), merge the files by the hospital identifier provided by the data source (DSHOSPID), but be careful of the different levels of aggregation. For example, the Core file may contain 5,000 discharges for DSHOSPID "A," but the Hospital file contains only 1 record for DSHOSPID "A."
Starting with the 2006 SID, the AHA Linkage files are available via the HCUP User Support website (www.hcup-us.ahrq.gov). The AHA Linkage files may not be available when the discharge-level database is released.
Diagnosis and Procedure Groups File is a discharge-level file that contains data elements from AHRQ software tools designed to facilitate the use of the International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM/PCS) diagnostic and procedure information in the HCUP databases. The unit of observation is an inpatient stay record. The HCUP unique record identifier (KEY) provides the linkage between the Core files and the Diagnosis and Procedure Groups files. These files are available beginning with the 2019 SID.
What is the File Structure of the SID in the 2016-2018 Files?
Based on the availability of data elements across States, data elements included in the 2016-2018 SID are structured as follows:
Unavailable with the 2016-2018 SID are two file types that had been included with the SID in prior data years: the Diagnosis and Procedure Groups file and the Disease Severity file. The data elements included in those two files were derived from AHRQ software tools. If you are interested in applying the AHRQ software tools to the ICD-10-CM/PCS data in the 2016-2018 SID, beta versions of the AHRQ software tools are available on the HCUP User Support website at www.hcup-us.ahrq.gov/tools_software.jsp. Also available is a tutorial on how to apply the AHRQ software tools to the HCUP databases at www.hcup-us.ahrq.gov/tech_assist/tutorials.jsp.
The Core file is a discharge-level file that contains:
Core data elements meet at least one of the following criteria:
State-specific data elements meet at least one of the following criteria:
The Charges file contains detailed charge information. There are three kinds of Charges files:
For example, if a patient had five laboratory tests, REVCD1 would include the revenue code for laboratory, CHG1 would include the total charge for the five tests, and UNIT1 would be five. To combine data elements between this type of Charges file and the Core file, merge the files by the unique record identifier (KEY). There will be a one-to-one correspondence of records.
For example, if a patient had five laboratory tests, there are five records in the Charges file with information on the charge for each laboratory test. Information from this type of Charges file may be combined with the Core file by the unique record identifier (KEY), but there is not a one-to-one correspondence of records.
Refer to the Description of Data Elements online at the HCUP User Support website (www.hcup-us.ahrq.gov) for more information on the charge information from the different States.
The AHA Linkage file contains AHA linkage data elements that allow the SID to be used in conjunction with the AHA Annual Survey of Hospitals data files. These files contain information about hospital characteristics and are available for purchase through the AHA. Because the data organizations in participating States determine whether the AHA linkage data elements may be released through the HCUP Central Distributor with the SID, not all SID include AHA linkage data elements.
The AHA Linkage file is a hospital-level file with one observation per hospital or facility. To combine the discharge-level files with the hospital-level file (AHA Linkage file), merge the files by the hospital identifier provided by the data source (DSHOSPID), but be careful of the different levels of aggregation. For example, the Core file may contain 5,000 discharges for DSHOSPID "A," but the Hospital file contains only 1 record for DSHOSPID "A."
Starting with the 2006 SID, the AHA Linkage files are available via the HCUP User Support website (www.hcup-us.ahrq.gov). The AHA Linkage files may not be available when the discharge-level database is released.
What is the File Structure of the SID in the 2015 Files?
The file structure of the 2015 SID is similar to previous years (and future years) in terms of how data elements are split across multiple data files, but differs from others years because the records within the 2015 files have been separated into two sets of files based on the discharge date because of the transition from reporting medical diagnoses and inpatient procedures using ICD-9-CM to the ICD-10-CM/PCS code sets.3
The 2015 SID are split into two separate sets of files based on the discharge date and different coding schemes:
Almost all of the diagnosis and procedure-related data elements that are based on ICD-10-CM/PCS data have been renamed with the prefix of I10 to distinguish them from the ICD-9-CM-based data element. Exceptions include data elements that are based on third-party proprietary software such as the Diagnosis Related Groups (DRGs) and the All Patient Refined DRG (APR-DRG).
Based on the availability of data elements across States, data elements included in the 2015 SID are structured as follows:
The Core file is a discharge-level file that contains:
Core data elements meet at least one of the following criteria:
State-specific data elements meet at least one of the following criteria:
The Charges file contains detailed charge information. There are three kinds of Charges files:
Refer to the Description of Data Elements online at the HCUP User Support website (www.hcup-us.ahrq.gov) for more information on the charge information from the different States.
The AHA Linkage file contains AHA linkage data elements that allow the SID to be used in conjunction with the AHA Annual Survey of Hospitals data files. These files contain information about hospital characteristics and are available for purchase through the AHA. Because the data organizations in participating States determine whether the AHA linkage data elements may be released through the HCUP Central Distributor with the SID, not all SID include AHA linkage data elements.
The AHA Linkage file is a hospital-level file with one observation per hospital or facility. To combine the discharge-level files with the hospital-level file (AHA Linkage file), merge the files by the hospital identifier provided by the data source (DSHOSPID), but be careful of the different levels of aggregation. For example, the Core file may contain 5,000 discharges for DSHOSPID "A," but the Hospital file contains only 1 record for DSHOSPID "A."
Starting with the 2006 SID, the AHA Linkage files are available via the HCUP User Support website http://www.hcup-us.ahrq.gov. The AHA Linkage files may not be available when the discharge-level database is released.
Diagnosis and Procedure Groups File is a discharge-level file that contains data elements from AHRQ software tools designed to facilitate the use of the International Classification of Diseases, Ninth Revision, Clinical Modification (ICD-9-CM) diagnostic and procedure information in the HCUP databases. The unit of observation is an inpatient stay record. The HCUP unique record identifier (KEY) provides the linkage between the Core files and the Diagnosis and Procedure Groups files. These files are available beginning with the 2005 SID.
Disease Severity Measures File is a discharge-level file that contains information from the AHRQ Comorbidity Software. Information from these severity files is to be used in conjunction with the Inpatient Core files. The unit of observation is an inpatient stay record. The HCUP unique record identifier (KEY) provides the linkage between the Core files and the Disease Severity Measures files. These files are available beginning with the 2005 SID.
What is the File Structure of the SID in the 2005-2014 Files?
Based on the availability of data elements across States, data elements included in the 2005-2014 SID are structured as follows:
The Core file is a discharge-level file that contains:
Core data elements meet at least one of the following criteria:
State-specific data elements meet at least one of the following criteria:
The Charges file contains detailed charge information. There are three kinds of Charges files:
Refer to the Description of Data Elements online at the HCUP User Support website (www.hcup-us.ahrq.gov) for more information on the charge information from the different States.
The AHA Linkage file contains AHA linkage data elements that allow the SID to be used in conjunction with the AHA Annual Survey of Hospitals data files. These files contain information about hospital characteristics and are available for purchase through the AHA. Because the data organizations in participating States determine whether the AHA linkage data elements may be released through the HCUP Central Distributor with the SID, not all SID include AHA linkage data elements.
The AHA Linkage file is a hospital-level file with one observation per hospital or facility. To combine the discharge-level files with the hospital-level file (AHA Linkage file), merge the files by the hospital identifier provided by the data source (DSHOSPID), but be careful of the different levels of aggregation. For example, the Core file may contain 5,000 discharges for DSHOSPID "A," but the Hospital file contains only 1 record for DSHOSPID "A."
Starting with the 2006 SID, the AHA Linkage files are available via the HCUP User Support website http://www.hcup-us.ahrq.gov. The AHA Linkage files may not be available when the discharge-level database is released.
Diagnosis and Procedure Groups Files is a discharge-level file that contains data elements from AHRQ software tools designed to facilitate the use of the International Classification of Diseases, Ninth Revision, Clinical Modification (ICD-9-CM) diagnostic and procedure information in the HCUP databases. The unit of observation is an inpatient stay record. The HCUP unique record identifier (KEY) provides the linkage between the Core files and the Diagnosis and Procedure Groups files. These files are available beginning with the 2005 SID.
Disease Severity Measures Files is a discharge-level file that contains information from the AHRQ Comorbidity Software. Information from these severity files is to be used in conjunction with the Inpatient Core files. The unit of observation is an inpatient stay record. The HCUP unique record identifier (KEY) provides the linkage between the Core files and the Disease Severity Measures files. These files are available beginning with the 2005 SID.
What is the File Structure of the SID in the 1998-2004 Files?
Based on the availability of data elements across States, data elements included in the 1998-2004 SID are structured as follows:
The Core file is a discharge-level file that contains:
Core data elements meet at least one of the following criteria:
State-specific data elements meet at least one of the following criteria:
The Charges file contains detailed charge information. There are two kinds of Charges files:
Refer to the Description of Data Elements online at the HCUP User Support website (www.hcup-us.ahrq.gov) for more information on the charge information from the different States.
The AHA Linkage file contains AHA linkage data elements that allow the SID to be used in conjunction with the AHA Annual Survey of Hospitals data files. These files contain information about hospital characteristics and are available for purchase through the AHA. Because the data organizations in participating States determine whether the AHA linkage data elements may be released through the HCUP Central Distributor with the SID, not all SID include AHA linkage data elements.
The Core and Charges files are discharge-level files with one observation per abstract. The same record is represented in each file, but contains different data elements. To combine data elements across discharge-level files, merge the files by the unique record identifier (KEY). There will be a one-to-one correspondence of records.
The AHA Linkage file is a hospital-level file with one observation per hospital or facility. To combine discharge-level files with the hospital-level file (AHA Linkage file), merge the files by the hospital identifier provided by the data source (DSHOSPID), but be careful of the different levels of aggregation. For example, the Core file may contain 5,000 discharges for DSHOSPID "A," but the Hospital file contains only 1 record for DSHOSPID "A."
What is the File Structure of the SID in the 1995-1997 Files?
Based on the availability of data elements across States, data elements included in the 1995-1997 SID are structured as follows:
The Core file contains core data elements that form the nucleus of the SID. Core data elements meet at least one of the following criteria:
The State-specific file contains State-specific data elements intended for limited use. State-specific data elements meet at least one of the following criteria:
The AHA Linkage file contains AHA linkage data elements that allow the SID to be used in conjunction with the AHA Annual Survey of Hospitals data files. These files contain information about hospital characteristics and are available for purchase through the AHA. Because the data organizations in participating States determine whether the AHA linkage data elements may be released through the HCUP Central Distributor with the SID, not all SID include AHA linkage data elements.
The Core and State-specific files are discharge-level files with one observation per abstract. The same record is represented in each file, but each contains different data elements. To combine data elements across discharge-level files, merge the files by the unique record identifier (SEQ_SID). There will be a one-to-one correspondence of records.
The AHA Linkage file is a hospital-level file with one observation per hospital or facility. To combine discharge-level files with the AHA Linkage file, merge the files by the hospital identifier provided by the data source (DSHOSPID), but be careful of the different levels of aggregation. For example, the Core may contain 5,000 discharges for DSHOSPID "A," but the AHA Linkage file contains only 1 record for DSHOSPID "A."
What is the File Structure of the SID in the 1990-1994 Files?
Based on the availability of data elements across States, data elements included in the 1990-1994 SID are structured the same as the 1998-2004 files. This includes a maximum of three types of files:
The Core file contains:
Core data elements meet at least one of the following criteria:
State-specific data elements meet at least one of the following criteria:
The Charges file contains detailed charge information. There are two kinds of Charges files:
Refer to the Description of Data Elements online at the HCUP User Support website (www.hcup-us.ahrq.gov) for more information on the charge information from the different States.
The AHA Linkage file contains AHA linkage data elements that allow the SID to be used in conjunction with the AHA Annual Survey of Hospitals data files. These files contain information about hospital characteristics and are available for purchase through the AHA. Because the data organizations in participating States determine whether the AHA linkage data elements may be released through the HCUP Central Distributor with the SID, not all SID include AHA linkage data elements.
The Core and Charges files are discharge-level files with one observation per abstract. The same record is represented in each file, but contains different data elements. To combine data elements across discharge-level files, merge the files by the unique record identifier (KEY). There will be a one-to-one correspondence of records.
The AHA Linkage file is a hospital-level file with one observation per hospital or facility. To combine discharge-level files with the hospital-level file (AHA Linkage file), merge the files by the hospital identifier provided by the data source (DSHOSPID), but be careful of the different levels of aggregation. For example, the Core file may contain 5,000 discharges for DSHOSPID "A," but the Hospital file contains only 1 record for DSHOSPID "A."
GETTING STARTED
SID Data Files
SID Data Files are provided on CD-ROMs. The number of CD-ROMs depends on the State and year of data.
To load SID data onto your PC, you will need between one and four gigabytes of space available, depending on which SID database you are using. Because of the size of the files, the data are distributed as self-extracting PKZIP compressed files. To decompress the data, you should follow these steps:
The ASCII data files will then be uncompressed into the selected destination directory. After the files are uncompressed, the *.exe files can be deleted.
SID Programs, Documentation, and Tools
The SID programs, technical documentation and HCUP tools are available online via the Databases page at the HCUP User Support website (www.hcup-us.ahrq.gov/databases.jsp). The site provides important resources for SID users, and all of the files may be downloaded free of charge. A summary is provided in Table 1.
The SID programs include SAS, SPSS, and Stata load programs containing the programming code necessary to convert SID ASCII files into SAS, SPSS, or Stata. Please note that for the 2015 SID, there will be one set of load programs for the Q1-Q3 files and another set of load programs for the Q4 files.
The SID technical documentation provides detailed descriptions of the structure and content of the SID.
The HCUP Tools include the Clinical Classifications Software (CCS) and general label and format information applicable to all HCUP databases.
Information intended to summarize key issues to be anticipated by researchers before analyzing health services outcomes in the HCUP databases that include ICD-10-CM/PCS coding is included on the HCUP User Support website (www.hcup-us.ahrq.gov/datainnovations/icd10_resources.jsp). The section discusses key differences in the structure of HCUP databases, presents preliminary coding differences that were observed in HCUP databases, and provides general guidance and forewarning to users interested in analyzing outcomes that are potentially impacted by the transition.
Table 1. SID Related Reports and Database Documentation Available on HCUP-US
Description of the SID Database
Restrictions on the Use
File Specifications and Load Programs
Data Elements
Additional Resources for Data Elements
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ICD-10-CM/PCS Included in the SID Starting With 2015
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1 ICD-10-CM/PCS: International Classification of Diseases, 10th Edition, Clinical Modification/ Procedure Coding System
2 ICD-9-CM: International Classification of Diseases, Ninth Edition, Clinical Modification
3 ICD-9-CM: International Classification of Diseases, Ninth Edition, Clinical Modification; ICD-10-CM/PCS: International Classification of Diseases, 10th Edition, Clinical Modification/ Procedure Coding System
| Internet Citation: Introduction to the HCUP State Inpatient Databases (SID). Healthcare Cost and Utilization Project (HCUP). June 2022. Agency for Healthcare Research and Quality, Rockville, MD. www.hcup-us.ahrq.gov/db/state/siddist/SID_Introduction.jsp. |
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