Regional centers are private, non-profit corporations that assist you with getting the services and supports you need under the Lanterman Act. Each regional center client is assigned a service coordinator, who helps you develop your IPP and helps you get services listed in your IPP, including services from other agencies, including Medi-Cal and the school district. There are 21 regional centers in California. Each one serves a different area of the state.
You can find the regional center directory here. (http://www.dds.ca.gov/RC/RCList.cfm)