- Hypopigmentation 709.00
- Hypopinealism 259.8
- Hypopituitarism (juvenile) (syndrome) 253.2
- Hypoplasia, hypoplasis 759.89
- Hypopotassemia 276.8
- Hypoproaccelerinemia (see also Defect, coagulation) 286.3
- Hypoproconvertinemia (congenital) (see also Defect, coagulation) 286.3
- Hypoproteinemia (essential) (hypermetabolic) (idiopathic) 273.8
- Hypoproteinosis 260
- Hypoprothrombinemia (congenital) (hereditary) (idiopathic) (see also Defect, coagulation) 286.3
- Hypopselaphesia 782.0
- Hypopyon (anterior chamber) (eye) 364.05
- Hypopyrexia 780.99
- Hyporeflex 796.1
- Hyporeninemia, extreme 790.99
- Hyporesponsive episode 780.09
- Hyposecretion
- Hyposegmentation of neutrophils, hereditary 288.2
- Hyposiderinemia 280.9
- Hyposmolality 276.1
- Hyposomatotropism 253.3
- Hyposomnia, unspecified (see also Insomnia) 780.52