- Hyperazotemia 791.9
- Hyperbetalipoproteinemia (acquired) (essential) (familial) (hereditary) (primary) (secondary) 272.0
- Hyperbilirubinemia 782.4
- Hyperbilirubinemica encephalopathia, newborn 774.7
- Hypercalcemia, hypercalcemic (idiopathic) 275.42
- Hypercalcinuria 275.40
- Hypercapnia 786.09
- Hypercarotinemia 278.3
- Hypercementosis 521.5
- Hyperchloremia 276.9
- Hyperchlorhydria 536.8
- Hypercholesterinemia - see Hypercholesterolemia
- Hypercholesterolemia 272.0
- Hypercholesterolosis 272.0
- Hyperchylia gastrica 536.8
- Hyperchylomicronemia (familial) (with hyperbetalipoproteinemia) 272.3
- Hypercoagulation syndrome (primary) 289.81
- Hypercorticosteronism
- Hypercortisonism
- Hyperdynamic beta-adrenergic state or syndrome (circulatory) 429.82
- Hyperekplexia 759.89
- Hyperelectrolytemia 276.9
