- Hydronephrosis 591
- Hydropericarditis (see also Pericarditis) 423.9
- Hydropericardium (see also Pericarditis) 423.9
- Hydroperitoneum 789.59
- Hydrophobia 071
- Hydrophthalmos (see also Buphthalmia) 743.20
- Hydropneumohemothorax (see also Hemothorax) 511.89
- Hydropneumopericarditis (see also Pericarditis) 423.9
- Hydropneumopericardium (see also Pericarditis) 423.9
- Hydropneumothorax 511.89
- Hydrops 782.3
- Hydropyonephrosis (see also Pyelitis) 590.80
- Hydrorachis 742.53
- Hydrorrhea (nasal) 478.19
- Hydrosadenitis 705.83
- Hydrosalpinx (fallopian tube) (follicularis) 614.1
- Hydrothorax (double) (pleural) 511.89
- Hydroureter 593.5
- Hydroureteronephrosis (see also Hydronephrosis) 591
- Hydrourethra 599.84
- Hydroxykynureninuria 270.2
- Hydroxyprolinemia 270.8
