- Hyperadrenalism (cortical) 255.3
- Hyperadrenocorticism 255.3
- Hyperaffectivity 301.11
- Hyperaldosteronism (atypical) (hyperplastic) (normoaldosteronal) (normotensive) (primary) 255.10
- Hyperalgesia (see also Disturbance, sensation) 782.0
- Hyperalimentation 783.6
- Hyperaminoaciduria 270.9
- Hyperammonemia (congenital) 270.6
- Hyperamnesia 780.99
- Hyperamylasemia 790.5
- Hyperaphia 782.0
- 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
