NAMH = - neurol
- nates
- natiform skull
- natimortality
- National Academies
- National Alliance for the Mentally Ill
- National board exams
- national census
- National Center for Complementary and Alternative Medicine (NCCAM)
- National Center for Research Resources (NCRR)
- National Clinical Assessment Authority
- National Eye Institute (NEI)
- National Formulary
- National Health Service
- National Health Service
- National Heart, Lung, and Blood Institute (NHLBI)
- National Human Genome Research Institute (NHGRI)
- National Institute for Occupational Safety and Health
- National Institute of Allergy and Infectious Diseases (NIAID)
- National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS)
- National Institute of Child Health and Human Development (NICHD)
- National Institute of Dental and Craniofacial Research (NIDCR)
- National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
- National Institute of Environmental Health Sciences (NIEHS)
- National Institute of General Medical Sciences (NIGMS)
- National Institute of Mental Health (NIMH)
- National Institute of Neurological Disorders and Stroke (NINDS)
- National Institute of Nursing Research (NINR)
- National Institute on Aging (NIA)
- National Institute on Alcohol Abuse and Alcoholism (NIAAA)
- National Institute on Deafness and Other Communication Disorders (NIDCD)
- National Institute on Drug Abuse (NIDA)
- National Institutes of Health (NIH)
- National Institutes of Health Clinical Center (CC)
- National Institute of Clinical Excellence
- National Insurance
- National Library of Medicine (NLM)
- National Patient Safety Agency
- national service frameworks
- natis
- native
