| NFB | National Foundation for the Blind; nonfermenting bacteria |
|---|---|
| NFC | National Fertility Center |
| NFCE | near-fatal choking episode |
| NFD | neurofibrillary degeneration |
| NFDR | neurofaciodigitorenal [syndrome] |
| NFE | nonferrous extract |
| NFH | heavy polypeptide of neurofilament protein; nonfamilial hematuria |
| NFIC | National Foundation for Ileitis and Colitis |
| NFID | National Foundation for Infectious Diseases |
| NFIRS | National Fire Incident Reporting System |