ICD-10-CM Alphabetic Index · FY 2026 Letter N
Index Terms Starting With N ICD-10-CM
Home › ICD-10-CM Codes List › Index to Diseases and Injuries › NThe letter N section of the FY 2026 Alphabetic Index carries 208 main terms , from Naegeli's to Nystagmus. Terms with a direct code link straight to the code page, cross references point to the main term that holds the codes, and terms with a handful of sub-entries render in full right here. The largest terms open their own full index page.
✓ Built from the official CMS FY 2026 index file Effective Oct 1, 2025 – Sep 30, 2026
Naegeli's Sub-entries
leukemia, monocytic
C93.1 Non-billable Naegleriasis (with meningoencephalitis) Code B60.2 Naffziger's syndrome Code G54.0 Naga sore Cross-ref See: Ulcer, skin
Nägele's pelvis Sub-entries M95.5 with disproportion (fetopelvic)
O33.0 causing obstructed labor
O65.0 Nail Sub-entries see also condition
Nanism, nanosomia Cross-ref See: Dwarfism Narcolepsy Sub-entries G47.419 in conditions classified elsewhere
G47.429 Narcotism Cross-ref See: Dependence
NARP (Neuropathy, Ataxia and Retinitis pigmentosa) syndrome Code E88.49 Narrow Sub-entries
anterior chamber angle
H40.03 Non-billable gingival width (of periodontal soft tissue)
K05.5 pelvis see Contraction, pelvis
Narrowing Sub-entries see also Stenosis basilar see Occlusion, artery, basilar
carotid see Occlusion, artery, carotid
Narrowness, abnormal, eyelid Code Q10.3 Nasal Cross-ref See: condition Nasolachrymal, nasolacrimal Cross-ref See: condition Nasopharyngeal Sub-entries see also condition
Nasopharyngitis (acute) (infective) (streptococcal) (subacute) Sub-entries J00 chronic (suppurative) (ulcerative)
J31.1 Nasopharynx, nasopharyngeal Cross-ref See: condition Natal tooth, teeth Code K00.6 Nausea (without vomiting) Sub-entries R11.0 gravidarum see Hyperemesis, gravidarum
marina
T75.3 Non-billable navalis
T75.3 Non-billable Navel Cross-ref See: condition Neapolitan fever Cross-ref See: Brucellosis
Near drowning Code T75.1 Non-billable Nearsightedness Cross-ref See: Myopia
Nebula, cornea Cross-ref See: Opacity, cornea
Necator americanus infestation Code B76.1 Neck Cross-ref See: condition Necrobiosis Sub-entries R68.89 with diabetes see E08-E13 with .620
Necrolysis, toxic epidermal Sub-entries L51.2 due to drug
correct substance properly administered see Table of Drugs and Chemicals, by drug, adverse effect
overdose or wrong substance given or taken see Table of Drugs and Chemicals, by drug, poisoning
Necrosis, necrotic (ischemic) Sub-entries see also Gangrene adrenal (capsule) (gland)
E27.49 amputation stump (surgical) (late)
T87.50 Necrospermia Cross-ref See: Infertility, male care provider because (of)
assistance with personal care
Z74.1 continuous supervision required
Z74.3 Neisserian infection NEC Cross-ref See: Gonococcus
Nelaton's syndrome Code G60.8 Nelson's syndrome Code E24.1 Nematodiasis (intestinal) Sub-entries B82.0 Neonatal Sub-entries see also Newborn screening, abnormal findings on see Abnormal, neonatal screening
Neonatorum Cross-ref See: condition endocrine, multiple (MEN)
E31.20 Neoplasm, neoplastic Sub-entries see also Table of Neoplasms lipomatous, benign see Lipoma
mast cell, of uncertain behavior NEC
D47.09 ciliary body see Disorder, iris, vascular
ghost vessels see Ghost, vessels
Nephroblastoma (epithelial) (mesenchymal) Code C64 Non-billable Nephrocalcinosis Code E83.59 Nephrocystitis, pustular Cross-ref See: Nephritis, tubulo-interstitial
Nephrolithiasis (congenital) (pelvis) (recurrent) Cross-ref See also: Calculus, kidney
Nephroma Sub-entries C64 Non-billable mesoblastic
D41.0 Non-billable Nephronephritis Cross-ref See: Nephrosis
Nephronophthisis Code Q61.5 Nephropathia epidemica Code A98.5 Nephropathy Sub-entries N28.9 see also Nephritis with
edema see Nephrosis
glomerular lesion see Glomerulonephritis
amyloid, hereditary
E85.0 Nephropyosis Cross-ref See: Abscess, kidney
Nephrosclerosis (arteriolar) (arteriosclerotic) (chronic) (hyaline) Sub-entries see also Hypertension, kidney
hyperplastic see Hypertension, kidney
with
foot process disease
N04.9 Nephrosonephritis, hemorrhagic (endemic) Code A98.5 Nephrostomy Sub-entries
Nerve Sub-entries see also condition
injury see Injury, nerve, by body site
Nervous Sub-entries R45.0 see also condition Nesidioblastoma Sub-entries
specified site NEC see Neoplasm, benign, by site
Nettleship's syndrome Cross-ref See: Urticaria pigmentosa
Neumann's disease or syndrome Code L10.1 acoustic (nerve)
auditory (nerve)
Neurapraxia Cross-ref See: Injury, nerve Neurasthenia Sub-entries F48.8 Neurilemmoma Sub-entries see also Neoplasm, nerve, benign
malignant see also Neoplasm, nerve, malignant
acoustic (nerve)
C72.4 Non-billable Neurilemmosarcoma Cross-ref See: Neoplasm, nerve, malignant
Neurinoma Cross-ref See: Neoplasm, nerve, benign
Neurinomatosis Cross-ref See: Neoplasm, nerve, uncertain behavior
abducens (nerve) see Strabismus, paralytic, sixth nerve
acoustic (nerve)
H93.3 Non-billable see also subcategory in (due to)
Neuroastrocytoma Cross-ref See: Neoplasm, uncertain behavior, by site
Neuroavitaminosis Code E56.9 Neuroblastoma Sub-entries
specified site see Neoplasm, malignant, by site
Neurochorioretinitis Cross-ref See: Chorioretinitis Neurocirculatory asthenia Code F45.8 Neurocysticercosis Code B69.0 Neurocytoma Cross-ref See: Neoplasm, benign, by site
Neurodermatitis (circumscribed) (circumscripta) (local) Sub-entries L28.0 Neuroencephalomyelopathy, optic Code G36.0 Neuroepithelioma Sub-entries see also Neoplasm, malignant, by site
Neurofibroma Sub-entries see also Neoplasm, nerve, benign
melanotic see Neoplasm, nerve, benign
multiple see Neurofibromatosis
plexiform see Neoplasm, nerve, benign
malignant see Neoplasm, nerve, malignant
type 1 (von Recklinghausen)
Q85.01 Neurofibrosarcoma Cross-ref See: Neoplasm, nerve, malignant
Neurogenic Sub-entries see also condition
bladder
N31.9 see also Dysfunction, bladder, neuromuscular cauda equina syndrome
G83.4 Neuroglioma Cross-ref See: Neoplasm, uncertain behavior, by site
Neurolabyrinthitis (of Dix and Hallpike) Cross-ref See: Neuronitis, vestibular Neurolathyrism Cross-ref See: Poisoning, food, noxious, plant
Neuroma Sub-entries see also Neoplasm, nerve, benign amputation (stump) (traumatic) (surgical complication) (late)
T87.3 Non-billable Neuromyalgia Cross-ref See: Neuralgia
Neuromyasthenia (epidemic) (postinfectious) Code G93.39 Neuromyelitis Sub-entries G36.9 Neuromyopathy Sub-entries G70.9 paraneoplastic (see also, Neoplasm, by site, if known)
D49.9 Neuromyotonia (Isaacs) Code G71.19 Neuronevus Cross-ref See: Nevus Neuronitis Sub-entries G58.9 ascending (acute)
G57.2 Non-billable vestibular
H81.2 Non-billable Neuroparalytic Cross-ref See: condition with psychosis see Psychosis, alcoholic
Neurophthisis Sub-entries see also Disorder, nerve
peripheral, diabetic see E08-E13 with .42
Neuroretinitis Cross-ref See: Chorioretinitis Neuroretinopathy, hereditary optic Code H47.22 Neurosarcoma Cross-ref See: Neoplasm, nerve, malignant
Neurosclerosis Cross-ref See: Disorder, nerve
Neurospongioblastosis diffusa Code Q85.1 with ataxia (cerebellar) (locomotor) (spastic) (spinal)
A52.19 arteritis (any artery) (cerebral)
A52.04 Neurothekeoma Cross-ref See: Neoplasm, nerve, benign
Neurotic Cross-ref See: Neurosis
Neurotoxemia Cross-ref See: Toxemia Neutroclusion Code M26.211 benign ethnic see Phenotype, Duffy, null
congenital (primary)
D70.0 cytoreductive cancer chemotherapy sequela
D70.1 Neutrophilia, hereditary giant Code D72.0 Nevocarcinoma Cross-ref See: Melanoma
achromic see Neoplasm, skin, benign
amelanotic see Neoplasm, skin, benign
angiomatousD18.00
abstinence syndrome
P96.1 affected by
abnormalities of membranes
P02.9 Newcastle conjunctivitis or disease Code B30.8 Nezelof's syndrome (pure alymphocytosis) Code D81.4 Niacin (amide) deficiency Code E52 Nicolas (-Durand)-Favre disease Code A55 Nicotine Cross-ref See: Tobacco
Nicotinic acid deficiency Code E52 Night Sub-entries
blindness see Blindness, night
Nightmares (REM sleep type) Code F51.5 NIHSS (National Institutes of Health Stroke Scale) score Code R29.7 Non-billable Nipple Cross-ref See: condition Nishimoto (-Takeuchi) disease Code I67.5 Nitritoid crisis or reaction Cross-ref See: Crisis, nitritoid Nitrosohemoglobinemia Code D74.8 No Sub-entries
general equivalence degree (GED)
Z55.5 health insurance coverage
Z59.71 Nocturia Sub-entries R35.1 Nocturnal Cross-ref See: condition Node (s) Sub-entries see also Nodule Bouchard's (with arthropathy)
M15.2 Heberden's (with arthropathy)
M15.1 actinomycotic see Actinomycosis
breast NEC
N63.0 see also Lump, breast colloid (cystic), thyroid
E04.1 cutaneous see Swelling, localized
Noma (gangrenous) (hospital) (infective) Sub-entries A69.0 Nomad, nomadism Code Z59.00 NOMID (neonatal onset multisystemic inflammatory disorder) Code M04.2 Non-accidental trauma Cross-ref See: Abuse, physical Nonadherence to medical treatment, specified NEC Sub-entries Z91.199 Nonautoimmune hemolytic anemia Sub-entries D59.4 Nonclosure Sub-entries see also Imperfect, closure
ductus arteriosus (Botallo's)
Q25.0 foramen
Nondescent (congenital) Sub-entries see also Malposition, congenital Nondevelopment Sub-entries
organ or site, congenital NEC see Hypoplasia
Nonengagement Sub-entries
head NEC
O32.4 Non-billable in labor, causing obstructed labor
O64.8 Non-billable Nonexanthematous tick fever Code A93.2 Nonexpansion, lung (newborn) Code P28.0 Nonfunctioning Sub-entries
cystic duct
K82.8 see also Disease, gallbladder gallbladder
K82.8 see also Disease, gallbladder labyrinth
Non-Hodgkin lymphoma NEC Cross-ref See: Lymphoma, non-Hodgkin
Nonimplantation, ovum Code N97.2 Noninsufflation, fallopian tube Code N97.1 Non-ketotic hyperglycinemia Code E72.51 Nonne-Milroy syndrome Code Q82.0 Non-palpable testicle (s) Sub-entries
Nonpatent fallopian tube Code N97.1 Nonpneumatization, lung NEC Code P28.0 Nonrotation Cross-ref See: Malrotation Nonsecretion, urine Cross-ref See: Anuria Nonunion Sub-entries
fracture see Fracture, by site
joint, following fusion or arthrodesis
M96.0 organ or site, congenital NEC see Imperfect, closure
symphysis pubis, congenital
Q74.2 Nonvisualization, gallbladder Code R93.2 Nonvital, nonvitalized tooth Code K04.99 Non-working side interference Code M26.56 Noonan's syndrome Code Q87.19 Normocytic anemia (infectional) due to blood loss (chronic) Sub-entries D50.0 Norrie's disease (congenital) Code Q15.8 North American blastomycosis Code B40.9 Nose, nasal Cross-ref See: condition Notching nose, congenital (tip) Code Q30.2 Nothnagel's Sub-entries
syndrome see Strabismus, paralytic, third nerve
vasomotor acroparesthesia
I73.89 Novy's relapsing fever Sub-entries A68.9 Noxious Sub-entries
foodstuffs, poisoning by see Poisoning, food, noxious, plant
substances transmitted through placenta or breast milk
P04.9 Nucleus pulposus Cross-ref See: condition Nuns' knee Cross-ref See: Bursitis, prepatellar Nursemaid's elbow Code S53.03 Non-billable Nutcracker esophagus Code K22.4 Nutrient element deficiency Sub-entries E61.9 due to
insufficient food
T73.0 Non-billable lack of
care (child)
T76.02 Non-billable Nutritional stunting Code E45 Nyctalopia (night blindness) Cross-ref See: Blindness, night
Nycturia Sub-entries R35.1 benign paroxysmal see Vertigo, benign paroxysmal
Source: Centers for Medicare & Medicaid Services, FY 2026 ICD-10-CM Index to Diseases and Injuries release files, effective October 1, 2025 through September 30, 2026.
