- Naegeli\’s
- Naegleriasis (with meningoencephalitis), B60.2
- Naffziger\’s syndrome, G54.0
- Naga sore
- Nail
- Nanism, nanosomia
- Nanophyetiasis, B66.8
- Nanukayami, A27.89
- Napkin rash, L22
- Narcolepsy, G47.419
- Narcosis, R06.89
- Narcotism
- NARP syndrome (Neuropathy, Ataxia and Retinitis pigmentosa), E88.49
- Narrow
- Narrowing
- Narrowness, abnormal, eyelid, Q10.3
- Nasal
- Nasolachrymal, nasolacrimal
- Nasopharyngeal
- Nasopharyngitis (acute) (infective) (streptococcal) (subacute), J00
- Nasopharynx, nasopharyngeal
- Natal tooth, teeth, K00.6
- Nausea (without vomiting), R11.0
- Navel
- Nägele\’s pelvis, M95.5
- Neapolitan fever
- Near drowning, T75.1
- Near-syncope, R55
- Nearsightedness
- Nebula, cornea
- Necator americanus infestation, B76.1
- Necatoriasis, B76.1
- Neck
- Necrobiosis, R68.89
- Necrolysis, toxic epidermal, L51.2
- Necrophilia, F65.89
- Necrosis, necrotic (ischemic)
- Necrospermia
- Need (for)
- Neglect
- Neisserian infection NEC
- Nelaton\’s syndrome, G60.8
- Nelson\’s syndrome, E24.1
- Nematodiasis (intestinal), B82.0
- Neonatal
- Neonatorum
- Neoplasia
- Neoplasm, neoplastic
- Neovascularization
- Nephralgia, N23
- Nephritis, nephritic (albuminuric) (azotemic) (congenital) (disseminated) (epithelial) (familial) (focal) (granulomatous) (hemorrhagic) (infantile) (nonsuppurative, excretory) (uremic), N05.9
- Nephroblastoma (epithelial) (mesenchymal), C64-
- Nephrocalcinosis, E83.59
- Nephrocystitis, pustular
- Nephrolithiasis (congenital) (pelvis) (recurrent)
- Nephroma, C64-
- Nephronephritis
- Nephronophthisis, Q61.5
- Nephropathia epidemica, A98.5
- Nephropathy, N28.9
- Nephroptosis, N28.83
- Nephropyosis
- Nephrorrhagia, N28.89
- Nephrosclerosis (arteriolar)(arteriosclerotic) (chronic) (hyaline)
- Nephrosis, nephrotic (Epstein\’s) (syndrome) (congenital), N04.9
- Nephrosonephritis, hemorrhagic (endemic), A98.5
- Nephrostomy
- Nerve
- Nerves, R45.0
- Nervous, R45.0
- Nervousness, R45.0
- Nesidioblastoma
- Nettleship\’s syndrome
- Neumann\’s disease or syndrome, L10.1
- Neuralgia, neuralgic (acute), M79.2
- Neurapraxia
- Neurasthenia, F48.8
- Neurilemmoma
- Neurilemmosarcoma
- Neurinoma
- Neurinomatosis
- Neuritis (rheumatoid), M79.2
- Neuroastrocytoma
- Neuroavitaminosis, E56.9
- Neuroblastoma
- Neurochorioretinitis
- Neurocirculatory asthenia, F45.8
- Neurocysticercosis, B69.0
- Neurocytoma
- Neurodermatitis (circumscribed) (circumscripta) (local), L28.0
- Neuroencephalomyelopathy, optic, G36.0
- Neuroepithelioma
- Neurofibroma
- Neurofibromatosis (multiple) (nonmalignant), Q85.00
- Neurofibrosarcoma
- Neurogenic
- Neuroglioma
- Neurolabyrinthitis (of Dix and Hallpike)
- Neurolathyrism
- Neuroleprosy, A30.9
- Neuroma
- Neuromyalgia
- Neuromyasthenia (epidemic) (postinfectious), G93.39
- Neuromyelitis, G36.9
- Neuromyopathy, G70.9
- Neuromyotonia (Isaacs), G71.19
- Neuronevus
- Neuronitis, G58.9
- Neuroparalytic
- Neuropathy, neuropathic, G62.9
- Neurophthisis
- Neuroretinitis
- Neuroretinopathy, hereditary optic, H47.22
- Neurosarcoma
- Neurosclerosis
- Neurosis, neurotic, F48.9
- Neurospongioblastosis diffusa, Q85.1
- Neurosyphilis (arrested) (early) (gumma) (late) (latent) (recurrent) (relapse), A52.3
- Neurothekeoma
- Neurotic
- Neurotoxemia
- Neutroclusion, M26.211
- Neutropenia, neutropenic (chronic) (genetic) (idiopathic) (immune) (infantile) (malignant) (pernicious) (splenic), D70.9
- Neutrophilia, hereditary giant, D72.0
- Nevocarcinoma
- Nevus, D22.9
- Newborn (infant) (liveborn) (singleton), Z38.2
- Newcastle conjunctivitis or disease, B30.8
- Nezelof\’s syndrome (pure alymphocytosis), D81.4
- Niacin deficiency (amide), E52
- Nicolas-Favre disease (-Durand), A55
- Nicotine
- Nicotinic acid deficiency, E52
- Niemann-Pick disease or syndrome, E75.249
- Night
- Nightmares (REM sleep type), F51.5
- NIHSS score (National Institutes of Health Stroke Scale), R29.7-
- Nipple
- Nisbet\’s chancre, A57
- Nishimoto disease (-Takeuchi), I67.5
- Nitritoid crisis or reaction
- Nitrosohemoglobinemia, D74.8
- Njovera, A65
- No general equivalence degree (GED), Z55.5
- Nocardiosis, nocardiasis, A43.9
- Nocturia, R35.1
- Nocturnal
- Nodal rhythm, I49.8
- Node (s)
- Nodule, nodular (s)
- Noma (gangrenous) (hospital) (infective), A69.0
- Nomad, nomadism, Z59.00
- NOMID (neonatal onset multisystemic inflammatory disorder), M04.2
- Non-Hodgkin lymphoma NEC
- Non-ketotic hyperglycinemia, E72.51
- Non-palpable testicle (s)
- Non-working side interference, M26.56
- Nonadherence to medical treatment, specified NEC, Z91.199
- Nonautoimmune hemolytic anemia, D59.4
- Nonclosure
- Noncompliance, Z91.199
- Nondescent (congenital)
- Nondevelopment
- Nonengagement
- Nonexanthematous tick fever, A93.2
- Nonexpansion, lung (newborn), P28.0
- Nonfunctioning
- Nonimplantation, ovum, N97.2
- Noninsufflation, fallopian tube, N97.1
- Nonne-Milroy syndrome, Q82.0
- Nonovulation, N97.0
- Nonpatent fallopian tube, N97.1
- Nonpneumatization, lung NEC, P28.0
- Nonrotation
- Nonsecretion, urine
- Nonunion
- Nonvisualization, gallbladder, R93.2
- Nonvital, nonvitalized tooth, K04.99
- Noonan\’s syndrome, Q87.19
- Normocytic anemia (infectional) due to blood loss (chronic), D50.0
- Norrie\’s disease (congenital), Q15.8
- North American blastomycosis, B40.9
- Norwegian itch, B86
- Nose, nasal
- Nose-picking, F98.8
- Nosebleed, R04.0
- Nosomania, F45.21
- Nosophobia, F45.22
- Nostalgia, F43.20
- Notch of iris, Q13.2
- Notching nose, congenital (tip), Q30.2
- Nothnagel\’s
- Novy\’s relapsing fever, A68.9
- Noxious
- Nucleus pulposus
- Numbness, R20.0
- Nuns\’ knee
- Nursemaid\’s elbow, S53.03-
- Nutcracker esophagus, K22.4
- Nutmeg liver, K76.1
- Nutrient element deficiency, E61.9
- Nutrition deficient or insufficient, E63.9
- Nutritional stunting, E45
- Nyctalopia (night blindness)
- Nycturia, R35.1
- Nymphomania, F52.8
- Nystagmus, H55.00