| NAS-NRC | National Academy of Science-National Research Council |
|---|---|
| NCD | National Commission on Diabetes; National Council on Drugs; neurocirculatory dystonia; nitrogen clea... |
| NCTC | National Cancer Tissue Culture; National Collection of Type Cultures |
| NDC | National Data Communications; National Drug Code; Naval Dental Clinic; nondifferentiated cell |
| NII | National Information Infrastructure; National Insurance Institute |
| NIDA | National Institute of Drug Abuse |
|---|---|
| NINDS | National Institute of Neurological Disorders and Stroke |
| NIST | National Institute of Standards and Technology |
| NKF DOQI | National Kidney Foundation Dialysis Outcomes Quality Initiative |
| NLM | National Labrary of Medicine |