- Hyalin plaque, sclera, senile 379.16
- Hyaline
- Hyalinosis cutis et mucosae 272.8
- Hyalitis (asteroid) 379.22
- Hydatid
- Hydatidiform mole (benign) (complicating pregnancy) (delivered) (undelivered) 630
- Hydatidosis - see Echinococcus
- Hyde's disease (prurigo nodularis) 698.3
- Hydradenitis 705.83
- Hydradenoma (M8400/0) - see Hidradenoma
- Hydralazine lupus or syndrome
- Hydramnios 657
- Hydrancephaly 742.3
- Hydranencephaly 742.3
- Hydrargyrism NEC 985.0
- Hydrarthrosis (see also Effusion, joint) 719.0
- Hydremia 285.9
- Hydrencephalocele (congenital) 742.0
- Hydrencephalomeningocele (congenital) 742.0
- Hydroa 694.0
- Hydroadenitis 705.83
- Hydrocalycosis (see also Hydronephrosis) 591
