- Hypernatremia 276.0
- Hypernephroma (M8312/3) 189.0
- Hyperopia 367.0
- Hyperorexia 783.6
- Hyperornithinemia 270.6
- Hyperosmia (see also Disturbance, sensation) 781.1
- Hyperosmolality 276.0
- Hyperosteogenesis 733.99
- Hyperostosis 733.99
- Hyperovarianism 256.1
- Hyperovarism, hyperovaria 256.1
- Hyperoxaluria (primary) 271.8
- Hyperoxia 987.8
- Hyperparathyroidism 252.00
- Hyperpathia (see also Disturbance, sensation) 782.0
- Hyperperistalsis 787.4
- Hyperpermeability, capillary 448.9
- Hyperphagia 783.6
- Hyperphenylalaninemia 270.1
- Hyperphoria 378.40
- Hyperphosphatemia 275.3
- Hyperpiesia (see also Hypertension) 401.9
