- Myelinoclasis, perivascular, acute (postinfectious) NEC 136.9 [323.61]
- Myelinosis, central pontine 341.8
- Myelitis (ascending) (cerebellar) (childhood) (chronic) (descending) (diffuse) (disseminated) (pressure) (progressive) (spinal cord) (subacute) (see also Encephalitis) 323.9
- Myelo-osteo-musculodysplasia hereditaria 756.89
- Myeloblastic - see condition
- Myelocele (see also Spina bifida) 741.9
- Myelocystocele (see also Spina bifida) 741.9
- Myelocytic - see condition
- Myelocytoma 205.1
- Myelodysplasia (spinal cord) 742.59
- Myeloencephalitis - see Encephalitis
- Myelofibrosis 289.83
- Myelogenous - see condition
- Myeloid - see condition
- Myelokathexis 288.09
- Myeloleukodystrophy 330.0
- Myelolipoma (M8870/0) - see Neoplasm, by site, benign
- Myeloma (multiple) (plasma cell) (plasmacytic) (M9730/3) 203.0
- Myelomalacia 336.8
- Myelomata, multiple (M9730/3) 203.0
- Myelomatosis (M9730/3) 203.0
- Myelomeningitis - see Meningoencephalitis