DOI: 10.57761/krfh-m184
title: HCUP California

description: The State Ambulatory Surgery Databases (SASD), State Inpatient Databases (SID), and State Emergency Department Databases (SEDD) are part of a family of databases and software tools developed for the Healthcare Cost and Utilization Project (HCUP).

HCUP's state-specific databases can be used to investigate state-specific and multi-state trends in health care utilization, access, charges, quality, and outcomes. PHS has several years (2008-2011) and datasets (SASSD, SED and SIDD) for HCUP California available.
description: **The State Ambulatory Surgery and Services Databases (SASD)** are State-specific files that include data for ambulatory surgery and other outpatient services from hospital-owned facilities. In addition, some States provide ambulatory surgery and outpatient services from nonhospital-owned facilities. The uniform format of the SASD helps facilitate cross-State comparisons. The SASD are well suited for research that requires complete enumeration of hospital-based ambulatory surgeries within geographic areas or States.



**The State Inpatient Databases (SID)** are State-specific files that contain all inpatient care records in participating states. Together, the SID encompass more than 95 percent of all U.S. hospital discharges. 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 geographic areas or states.



**The State Emergency Department Databases (SEDD)** are a set of longitudinal State-specific emergency department (ED) databases included in the HCUP family. The SEDD capture discharge information on all emergency department visits that do not result in an admission. Information on patients seen in the emergency room and then admitted to the hospital is included in the [State Inpatient Databases (SID)](<https://www.hcup-us.ahrq.gov/sidoverview.jsp>)



[SASD](<https://www.hcup-us.ahrq.gov/db/state/sasddbdocumentation.jsp>), [SID](<https://www.hcup-us.ahrq.gov/db/state/siddbdocumentation.jsp>), and [SEDD](<https://www.hcup-us.ahrq.gov/db/state/sedddbdocumentation.jsp>) each have **Documentation **which includes:

- Description of the Database
- Restrictions on Use
- File Specifications and Load Program
- Data Elements
- Additional Resources for Data Elements
- ICD-10-CM/PCS Data Included in the Dataset Starting with 2015
- Known Data Issues
- HCUP Tools: Labels and Formats
- HCUP Supplemental Files
- Obtaining HCUP Data

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description: #Before Manuscript Submission  
**All manuscripts** (and other items you'd like to publish) **must be submitted to**

**phsdatacore@stanford.edu** for approval prior to journal submission.



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For more information about how to cite PHS and PHS datasets, please visit:

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description: #Documentation  
The HCUP California inpatient files were constructed from the confidential files received from the Office of Statewide Health Planning and Development (OSHPD). OSHPD excluded inpatient stays that, after processing by OSHPD, did not contain a complete and “in-range” admission date or discharge date. California also excluded inpatient stays that had an unknown or missing date of birth. OSHPD removes ICD-9-CM and ICD-10-CM diagnoses codes for HIV test results. Beginning with 2009 data, OSHPD changed regulations to require hospitals to report all external cause of injury diagnosis codes including those specific to medical misadventures. Prior to 2009, OSHPD did not require collection of diagnosis codes identifying medical misadventures.

**Types of Facilities Included in the Files Provided to HCUP by the Partner **

California supplied discharge data for inpatient stays in general acute care hospitals, acute psychiatric hospitals, chemical dependency recovery hospitals, psychiatric health facilities, and state operated hospitals. A comparison of the number of hospitals included in the SID and the number of hospitals reported in the AHA Annual Survey is available starting in data year 2010. Hospitals do not always report data for a full calendar year. Some hospitals open or close during the year; other hospitals have technical problems that prevent them from reporting data for all months in a year.

**Inclusion of Stays in Special Units **

Included with the general acute care stays are stays in skilled nursing, intermediate care, rehabilitation, alcohol/chemical dependency treatment, and psychiatric units of hospitals in California. How the stays in these different types of units can be identified differs by data year. Beginning in 2006, the information is retained in the HCUP variable HOSPITALUNIT. Reliability of this indicator for the level of care depends on how it was assigned by the hospital. For data years 1998-2006, the information was retained in the HCUP variable LEVELCARE. Prior to 1998, the first digit of the source hospital identifier (DSHOSPID) contained information on the level of care as follows:

- General acute care (value = 1),
- Skilled nursing and intermediate care (value = 3), and
- Rehabilitation care (value = 6).

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For discharges from facilities licensed as psychiatric care (value = 4) or alcohol/chemical dependency recovery treatment (value = 5), California continued to assign the type of care code to all discharges from the facility.



**Exclusion of Records During HCUP Data Processing **

Records with a discharge disposition of “still a patient” or “admitted as an inpatient” were excluded from the HCUP California inpatient data. For more details see: HCUP California



**Guides**

1. [The State Ambulatory Surgery and Services Databases (SASSD)](<https://www.hcup-us.ahrq.gov/db/state/sasddbdocumentation.jsp>)
2. [The State Emergency Department Databases (SEDD)](<https://www.hcup-us.ahrq.gov/seddoverview.jsp>)
3. [The State Inpatient Databases (SID](<https://www.hcup-us.ahrq.gov/sidoverview.jsp>))

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