Is an intensivist the same thing as a critical care healthcare specialist?

Not necessarily. Is the "critical care healthcare specialist" a physician, or not? There r some non-physician providers operating under physician supervision. They r not intensivists. Physicians (md and do) in anesthesiology, medicine + surgery r the most common intensivists. After medical school + residency, additional critical care training is required 2 b eligible 4 critical care board certification. Dr mike.
Is a difference. An intensivist is a physician who has specialized (via training) in critical care medicine. A critical care healthcare specialist is not an officially recognized term and could be a physician or a physician assistant or a nurse who has specialized in critical care medicine.