eurocritical care (NCC) is a specialty drawing professionals with background training in neurology, neurosurgery, anesthesiology, internal medicine, and emergency medicine. Since the 1980s, NCC has grown into an organized subspecialty with establishment of neurointensive care units (neuro-ICUs) and professional organizations. The most prominent dedicated society, the Neurocritical Care Society (NCS), founded in 2002, counts more than 2500 members, with neurologists comprising the largest primary specialty (Rakela Miller, NCS, written communication, June 5, 2018). Neurocritical care education varies among different countries. In the United States, neurocritical care subspecialization can be pursued through fellowship training after completion of residency training in neurology, neurosurgery, anesthesiology, internal medicine, or emergency medicine, or as additional training after completing a critical care fellowship program. Fellowships are accredited by 2 organizations: United Council for Neurologic Subspecialties (UCNS) and, for neurosurgeons, Committee on Advanced Subspecialty Training. Currently, there are 68 UCNSaccredited neurocritical care programs and 22 Committee on Advanced Subspecialty Training programs; the numbers are growing. Among 1374 UCNS-certified diplomats in neurocritical care, 576 (41.9%) are board-certified neurologists (Becky Swanson, UCNS, written communication, April 17, 2018). Following efforts to integrate neurocritical care with other subspecialties, neurocritical care has recently been approved as a subspecialty by the American Board of Medical Specialties. It is yet to be seen how this approval will affect organization and education.In other countries, the proportion of neurologists within the pool of neurointensivists varies, but independently, the addition of neurocritical care has opened a new career path to neurologists IMPORTANCE Neurocritical care has grown into an organized specialty that may have consequences for patient care, outcomes, research, and neurointensive care (neuroICU) technology.OBSERVATIONS Neurocritical care improves care and outcomes of the patients who are neurocritically ill, and neuroICUs positively affect the financial state of health care systems. The development of neurocritical care as a recognized subspecialty has fostered multidisciplinary research, neuromonitoring, and neurocritical care information technology, with advances and innovations in practice and progress.CONCLUSIONS AND RELEVANCE Neurocritical care has become an important part of health systems and an established subspecialty of neurology. Understanding its structure, scope of practice, consequences for care, and research are important.