ICD-10-CM
- H (Hartnup's) disease
- H-ABC (hypomyelination with atrophy of the basal ganglia and cerebellum)
- Haemophilus (H.) influenzae, as cause of disease classified elsewhere
- HAFOUS (Hao-Fountain syndrome)
- Hageman's factor defect, deficiency or disease
- Hailey-Hailey disease
- Hairball in stomach
- Hair-pulling, pathological (compulsive)
- Hairy black tongue
- Half vertebra
- Halitosis
- Hallerman-Streiff syndrome
- Hallervorden-Spatz disease
- Hallopeau's acrodermatitis or disease
- Halo, visual
- Hamartosis
- Hamman-Rich syndrome
- Hand-foot syndrome
- Hand-Schüller-Christian disease or syndrome
- Hangover (alcohol)
- Hanhart's syndrome
- Hanot's cirrhosis or disease
- Hanot-Chauffard (-Troisier) syndrome
- Hantaan virus disease (Korean hemorrhagic fever)
- Happy puppet syndrome
- Harada's disease or syndrome
- Hardship, material, due to limited financial resources, specified NEC
- Harlequin (newborn)
- Harley's disease
- Hartnup's disease
- Harvester's lung
- Harvesting ovum for in vitro fertilization
- Hashimoto's disease or thyroiditis
- Hashitoxicosis (transient)
- Hassal-Henle bodies or warts (cornea)
- Haverhill fever
- Hayem-Widal syndrome
- Haygarth's nodes
- Haymaker's lung
- Heartland virus disease
- Hebephrenia, hebephrenic (schizophrenia)
- Heberden's disease or nodes (with arthropathy)
- Heerfordt's disease
- HeFH (heterozygous familial hypercholesterolemia)
- Hegglin's anomaly or syndrome
- Heilmeyer-Schoner disease
- Heine-Medin disease
- Heinz body anemia, congenital
- Heliophobia
- Heller's disease or syndrome
- Heloma
- Hematidrosis
- Hematobilia
- Hematocolpos (with hematometra or hematosalpinx)
- Hematomyelitis
- Hematophobia
- Hematopneumothorax(see Hemothorax)
- Hematopoiesis, cyclic
- Hematospermia
- Hematothorax(see Hemothorax)
- Hemi-akinesia
- Hemianalgesia
- Hemianencephaly
- Hemianesthesia
- Hemiathetosis
- Hemiballism (us)
- Hemicardia
- Hemicephalus, hemicephaly
- Hemichorea
- Hemiectromelia
- Hemihypalgesia
- Hemihypesthesia
- Hemi-inattention
- Hemimegalencephaly
- Hemiparesthesia
- Hemiparkinsonism
- Hemispasm (facial)
- Hemisporosis
- Hemitremor
- Hemolymphangioma
- Hemophthalmos
- Henoch (-Schönlein) disease or syndrome (purpura)
- Henpue, henpuye
- Hepar lobatum (syphilitic)
- Hepatalgia
- Hepatoblastoma
- Hepatocarcinoma
- Hepatocholangiocarcinoma
- Hepatocholangioma, benign
- Hepatocholangitis
- Hepatolenticular degeneration
- Hepatoptosis
- Hepatorenal syndrome following labor and delivery
- Hepatosis
- Hereditary alpha tryptasemia (syndrome)
- Heredopathia atactica polyneuritiformis
- Herlitz' syndrome
- Hermansky-Pudlak syndrome
- Herpangina
- Herpetophobia
- Hers' disease
- Herter-Gee syndrome
- Herxheimer's reaction
- Heterophyes, heterophyiasis (small intestine)
- Heubner-Herter disease
- Hexadactylism
- Hidradenitis (axillaris) (suppurative)
- Hildenbrand's disease
- Hippel's disease
- Hippophobia
- Hippus
- Hirschsprung's disease or megacolon
- Hirsutism, hirsuties
- Hiss-Russell dysentery
- Histidinemia, histidinuria
- His-Werner disease
- Hoarseness
- Hobo
- Hoffa's disease
- Hoffa-Kastert disease
- Hoffmann-Bouveret syndrome
- HoFH (homozygous familial hypercholesterolemia)
- Holiday relief care
- Holoprosencephaly
- Holt-Oram syndrome
- Homocysteinemia
- Homocystinemia
- Homocystinuria
- Homogentisate 1,2-dioxygenase deficiency
- Horseshoe kidney (congenital)
- HSCT-TMA (hematopoietic stem cell transplantation-associated thrombotic microangiopathy)
- Humidifier lung or pneumonitis
- Humiliation (experience) in childhood
- Hungry bone syndrome
- Hurler (-Scheie) disease or syndrome
- Hurst's disease
- Hutchinson-Gilford disease or syndrome
- Hyaline membrane (disease) (lung) (pulmonary) (newborn)
- Hyalin plaque, sclera, senile
- Hydradenitis (axillaris) (suppurative)
- Hydramnios
- Hydremia
- Hydroadenitis (axillaris) (suppurative)
- Hydrocolpos (congenital)
- Hydrometra
- Hydrometrocolpos
- Hydromicrocephaly
- Hydromphalos (since birth)
- Hydromyelia
- Hydroperitoneum
- Hydrophthalmos
- Hydropyonephrosis
- Hydrorachis
- Hydrosadenitis (axillaris) (suppurative)
- Hydrosalpinx (fallopian tube) (follicularis)
- Hydrourethra
- Hydroxykynureninuria
- Hydroxylysinemia
- Hydroxyprolinemia
- Hymenolepis, hymenolepiasis (diminuta) (infection) (infestation) (nana)
- Hypalgesia
- Hyperacusis
- Hyperadrenalism
- Hyperalgesia
- Hyperammonemia (congenital)
- Hyperbicarbonatemia
- Hypercalcemia, hypocalciuric, familial
- Hypercalciuria, idiopathic
- Hypercarotenemia (dietary)
- Hypercementosis
- Hyperchloremia
- Hyperchylia gastrica, psychogenic
- Hypercoagulation (state)
- Hypercorticalism, pituitary-dependent
- Hyperekplexia
- Hyperelectrolytemia
- Hyperestrogenism (drug-induced) (iatrogenic)
- Hyperexplexia
- Hyperfructosemia
- Hypergastrinemia
- Hyperglobulinemia
- Hyperglycinemia (non-ketotic)
- Hyperheparinemia
- Hyperhistidinemia
- Hyperhomocysteinemia
- Hyperhydroxyprolinemia
- Hyperkalemia
- Hyperleucine-isoleucinemia
- Hyperlucent lung, unilateral
- Hyperlysinemia
- Hypermenorrhea
- Hypermethioninemia
- Hypermetropia (congenital)
- Hypernasality
- Hypernatremia
- Hypernephroma
- Hyperorexia nervosa
- Hyperornithinemia
- Hyperosmia
- Hyperosmolality (see also, Diabetes, by type, with hyperosmolarity)
- Hyperovarism
- Hyperpathia
- Hyperpermeability, capillary
- Hyperphagia
- Hyperphenylalaninemia NEC
- Hyperphoria (alternating)
- Hyperphosphatemia
- Hyperpinealism
- Hyperpituitarism
- Hyperpotassemia
- Hyperprebetalipoproteinemia (familial)
- Hyperprolactinemia
- Hyperprolinemia (type I) (type II)
- Hyperproteinemia
- Hyperprothrombinemia, causing coagulation factor deficiency
- Hyper-reflexia
- Hypersalivation
- Hypersegmentation, leukocytic, hereditary
- Hypersplenia, hypersplenism
- Hyperstimulation, ovaries (associated with induced ovulation)
- Hypertelorism (ocular) (orbital)
- Hyperthecosis ovary
- Hypertriglyceridemia, essential
- Hypertropia
- Hypertyrosinemia
- Hyperuricemia (asymptomatic)
- Hyperuricosuria
- Hypervalinemia
- Hypoalbuminemia
- Hypoaldosteronism
- Hypoalphalipoproteinemia
- Hypobarism
- Hypobaropathy
- Hypobetalipoproteinemia (familial)
- Hypochloremia
- Hypochondrogenesis
- Hypochondroplasia
- Hypochromasia, blood cells
- Hypocitraturia
- Hypoeosinophilia
- Hypoesthesia
- Hypogalactia
- Hypoglossia
- Hypohidrosis, hypoidrosis
- Hypoinsulinemia, postprocedural
- Hypokalemia
- Hypolipoproteinemia (alpha) (beta)
- Hypomania, hypomanic reaction
- Hypometabolism
- Hypomyelination - hypogonadotropic hypogonadism - hypodontia
- Hypomyelination with atrophy of the basal ganglia and cerebellum (H-ABC)
- Hyponasality
- Hyponatremia
- Hypo-osmolality
- Hypo-ovarianism, hypo-ovarism
- Hypophoria
- Hypopinealism
- Hypoplasminogenemia
- Hypopnea, obstructive sleep apnea
- Hypopotassemia
- Hypoproconvertinemia, congenital (hereditary)
- Hypoproteinemia
- Hypoptyalism
- Hypopyrexia
- Hyporeflexia
- Hyposegmentation, leukocytic, hereditary
- Hyposiderinemia
- Hyposplenism
- Hyposthenuria
- Hypotropia
- Hysteralgia, pregnant uterus
- Hysteroepilepsy