Analysis of the California In-Home Supportive Services (IHSS) Plus Waiver Demonstration Program. Data Sources (7)


The project uses administrative data from three California departments: Health Care Services, Social Services, and Developmental Services. These were linked using a combination of each data set’s assigned identification number, a Medicaid eligibility number, and a unique project assigned identifier. To assure the confidentiality of the individual recipients the records available to the project included only the project’s unique identification number. Recipient and provider name, phone number, address, and Social Security number were all removed from these records:8

  • Case Management Information and Payrolling System (CMIPS). This data set is compiled and maintained by the Department of Social Services (DSS). It contains information on all IHSS recipients (including age, gender, race/ethnicity, living arrangement, physical and cognitive status, and hours of authorized IHSS services), provider characteristics (age, gender, race/ethnicity, relationship to recipient, and hours of paid personal care service), and for 2004 the IHSS payments for Residual Program services. IHSS 2005 expenditures are obtained from Medicaid claims.

  • Medi-Cal Claims Data. These data are compiled and maintained by the California Department of Health Care Services as part of the Medi-Cal service payment system. Claims provide diagnoses, Medicaid-reimbursed health care use (i.e., physician, ER, hospital, home health, personal care, nursing home), and HCBS use (including both State Plan PCSP and waivers).

  • Department of Developmental Services (DDS) Data. Three data sets are available for the persons served by programs in DDS: the Client Master File (CMF), the Client Development Evaluation Report, and the Purchase of Services System (POS). The CMF contains demographic and address information on all persons served by DDS. This file was used to link DDS data with the CMIPS core data set. The other data files were not used in the present analysis.9

  1. The initial planning for this project had hoped to include information from community care licensing (CCL). CCL is a division within DSS responsible for licensing supportive housing. Such data would have allowed us to identify any months (either before or subsequent to IHSS receipt) in which the study’s IHSS recipients lived in licensed residential care facilities and/or adult care facilities. This phase of the project was precluded by the recipient confidentiality terms of the Data Sharing Agreements negotiated between the University of California and the study’s three collaborating state departments.

  2. These procedures assure autonomy of recipients and comply with the protection of human subjects protections procedures approved by the Committee on Human Research, University of California, San Francisco (approval #H945-28245), and the California State Committee on the Protection of Human Subjects (approval #06-02-03).

  3. CDER provides developmental, mental health, and medical diagnostic information; and information on hearing, vision, behavioral medication, health care equipment, behavior risk assessment, legal information, motor domain assessment, independent living domain assessment, social skills domain assessment, emotional needs assessment, cognitive domain assessment, and communication domain assessment. POS data identifies provider fiscal information for both state general funds and Medicaid DDS waiver funded service use and expenditure. These later data are also available in Medi-Cal claims files. To assure consistency in the source of Medicaid expenditures, we limited our attention to the claims files.

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