What is Disability Ministry?

Does disability ministry require its own staff person or volunteers? Does it require its own room and time to meet? As a parent of two children with autism, I would just assume that any church that we attended would provide ministry even if there were no other children with special needs. It would never enter my mind that ministry would have to wait until “critical mass.” I am not criticizing churches that have organized disability ministries that have specific events for large groups of people with special needs. I am just saying that is not the only form of disability ministry.