Multiplan is not necessarily an insurance provider but does offer one of the largest preferred provider organizations within the country. A provider network is something that insurance carriers in Massachusetts will have to provide their clients. Some of the insurance carriers in Massachusetts will lease the Multiplan provider network, and those who are insured through one of these insurance companies can access this network. Within a provider network, you can find behavioral health programs, and substance abuse treatment resources to treat drug and alcohol addiction. When searching for a service provider, you will come across both state-funded and private programs. Both types of services do often accept some type of health insurance, but you should contact the drug rehab program to find out what will be taken. Each health insurance plan is different from the next, and the extent of your coverage will be dependent on the type of plan.