- 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
- Hypospadias (male) 752.61
- Hypospermatogenesis 606.1
- Hyposphagma 372.72
- Hyposplenism 289.59
- Hypostasis, pulmonary 514
- Hypostatic - see condition