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Medical/Health Mutual Aid System
overview | system coordinators | OES region IV multi-casualty planOverview
When disaster strikes, local medical and health resources may be inadequate to meet the demand. The Medical/Health Mutual Aid System is designed to address this issue by facilitating the distribution of regional, state, and/or federal resources to the area(s) in need.In California the Medical/Health Mutual Aid System is facilitated by grouping counties, referred to as Operational Areas, together to form six Mutual Aid Regions. Within a region, if disaster strikes, resources are distributed from the unaffected Operational Areas to the affected one.
San Joaquin County is part of Region IV. Other counties in Region IV include Alpine, Amador, Calavaras, El Dorado, Nevada, Placer, Sacramento, Stanislaus, Tuolumne, and Yolo.
View a detail map of Region IV >>
View a map showing the six Mutual Aid Regions >>
System Coordinators
Medical Health Operational Area Coordinator (MHOAC)An individual appointed by a county Department of Health Director/Local Health Officer who is responsible in the event of a disaster or major incident where mutual aid is requested, for obtaining and coordinating services and allocation of resources within the Operational Area (county).
Regional Disaster Medical Health Coordinator (RDMHC)
A volunteer local health officer, EMS agency medical director or EMS agency administrator jointly appointed by the Directors of the California Department of Health Services (DHS) and the Emergency Medical Services Authority (EMSA) based upon the recommendation of the local health officer for a mutual aid region. The role of the RDMHC is to plan for and coordinate medical and health resources within one of California's six mutual aid regions during times of disaster or other major event requiring medical or health mutual aid.
Regional Disaster Medical Health Specialist (RDMHS)
An individual selected by a local EMS agency, under contract with EMSA, as a staff function to coordinate preparedness activities, and to assist the RDMHC in coordinating services in the event of a disaster or in the event that medical mutual aid of some type is requested.
Click here to see a diagram that illustrates how the System Coordinators orchestrate the Medical/Health Mutual Aid process.
OES Region IV Multi-Casualty (MCI) Plan
The current OES Region IV Multi-Casualty (MCI) Plan is comprised of 3 interdependent manuals: Manual I - MCI Field Operations; Manual II - MCI Patient Dispersion (Control Facility Operations); and Manual III - Medical Health Mutual Aid.The Adobe Acrobat Reader is needed to view and print the documents below. If you experience difficulty viewing the following documents you may download the Adobe Acrobat Reader for free from the Adobe web site.
| Title | Revision Date | Size |
| Manual 1- Multi-Casualty Incident Field Operations (PDF) | June 1998 | 23.5 MB |
| Manual 2- Multi-Casualty Patient Dispersion (PDF) | February 1998 | 16.3 MB |
| Manual 3- Medical Health Mutual Aid (PDF) | March 2005 | 688 KB |
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