Diagnostic Information and Instruments

The Client Development Evaluation Report (CDER) is an instrument used to collect diagnostic and evaluation information on individuals with developmental disabilities. A CDER is completed by a regional center or developmental center on each individual at the time of the initial Individual Program Plan (IPP) and is updated whenever there is a new IPP.

In January 2008, the Department began transitioning its CDER database to a revised instrument with more current diagnostic standards and updated evaluation questions. This transition took place in phases with the full transition completed in July 2011. While some of the revised CDER information is similar to that from the prior system, many data items are changed or new information from these items will not be comparable to prior information.

Quarterly CDER Client Characteristics Reports

Quarterly Client Characteristics Report
Statewide summary demographic and diagnostic information by regional center, developmental center, qualifying diagnosis, ethnicity, and age.
Quarterly Client Characteristics by County of Residence
Demographic and diagnostic information by county of residence.
Data Interpretation Considerations and Limitations (PDF)
Information to assist users in interpreting changes in the numbers from one quarterly report to another.

Diagnostic Instruments

CDER Materials for Regional Centers
The CDER has changed since the beginning of January 3, 2011, to comply with the Centers for Medicare and Medicaid Services (CMS) requirements to use ICD-10 codes for medical diagnosis and inpatient procedure coding.


Last modified: November 20, 2019