N-MIAN-methylimidazole acetaldehyde
N-MIAAN-methylimidazole acetic acid
N0Regional lymph node stage – There is no cancer in nearby lymph nodes
N1Cancer in lymph node – Stage 1
N2Cancer in lymph node – Stage 2
N3Cancer in lymph node – Stage 3
NABSnormal active bowel sounds
NAFLnon‐alcoholic fatty liver
NAFLDnon‐alcoholic fatty liver disease
NAKnumb-associated kinase
nAMDneovascular age-related macular degeneration
NAP1L2nucleosome assembly protein 1 like 2
NASAHnon-aneurysmal subarachnoid hemorrhage
NASHnonalcoholic steatohepatitis
NBCCSnevoid basal cell carcinoma syndrome
NBNBnon-bloody, non-bilious
NBUVBnarrowband ultraviolet B
NCCAHnon-classical congenital adrenal hyperplasia
NCCNNational Comprehensive Cancer Network
NCCTnoncontrast computed tomography
NCDNational Coverage Determination
NCINational Cancer Institute
NCSnerve conduction study
NCTnational clinical trial
NCVNerve Conduction Velocity
ndGBMnewly diagnosed glioblastoma multiforme
NDRnational determination for reimbursement
NEDno evidence of disease
NF-κBnuclear factor kappa B
NF1neurofibromatosis type 1
NGSnext-generation sequencing
NHEJnon-homologous end joining
NHLnon-Hodgkin’s lymphoma
NHLBINational Heart, Lung, and Blood Institute
NHLOCnursing home level of care
NIAAANational Institute on Alcohol Abuse and Alcoholism
NICMnonischemic cardiomyopathy
NICUneonatal intensive care unit
NICVDNational Institute of Cardiovascular Diseases
NIDCMnon-ischemic dilated cardiomyopathy
NIDDMnon-insulin dependent diabetes mellitus
NIHNational Institutes of Health
NIHSSNational Institutes of Health stroke scale
NIPSnoninvasive prenatal screening
NIPTnoninvasive prenatal testing
NIVnon-invasive ventilation
NKDAno known drug allergies
NLMNational Library of Medicine
NLPHLnodular lymphocyte predominant Hodgkin lymphoma
NLRP12Nucleotide-Binding Oligomerization Domain, Leucine Rich Repeat And Pyrin Domain Containing 12
NMCLnon-mucinous cystic lesion
nmCRPCnon-metastatic castration-resistant prostate cancer
NMDneurosurgery for mental disorder
NMESneuromuscular electrical stimulation
NMIBCnon-muscle invasive bladder cancer
NMPKnon-microprocessor-controlled prosthetic knee
NMRnuclear magnetic resonance
NMSCnon-melanoma skin cancer
NNISNational Nosocomial Infection Surveillance System
NNTnumbers needed to treat
NOACnon-vitamin K oral anticoagulant
NOMnonoperative management
NOSnot otherwise specified
npAIRnon-paraneoplastic autoimmune retinopathy
NPCnasopharyngeal carcinoma
NPHneutral protamine Hagedorn
NPPVnon-invasive positive pressure ventilation
NPVnegative predictive value
NPWTnegative pressure wound therapy
nr-axSpANon-Radiographic Axial Spondyloarthritis
NRASneuroblastoma Rat sarcoma virus viral oncogene homolog
NREMnon-rapid eye movement
NRInet reclassification improvement
NS3nonstructural protein 3
NS5Anonstructural protein 5A
NSAAnonsteroidal antiandrogen
NSAIDnonsteroidal antiinflammatory drug(s)
NSCLCnon-small cell lung cancer
NSMLNoonan syndrome with multiple lentigines
NSQIPNational Surgical Quality Improvement Program
NSTEMInon-ST elevation myocardial infarction
NSVTnon-sustained ventricular tachycardia
NT-proBNPN-terminal pro b-type natriuretic peptide
NTMnontuberculous mycobacteria
NTXamino-terminal telopeptide of type 1 collagen
NVAFnon-valvular atrial fibrillation
NXRegional lymph node stage – Cancer in nearby lymph nodes cannot be measured
NXGNecrobiotic xanthogranuloma
NYHANew York Heart Association