- Microinfarct, heart (see also Insufficiency, coronary) 411.89
- Microlithiasis, alveolar, pulmonary 516.2
- Micromyelia (congenital) 742.59
- Micropenis 752.64
- Microphakia (congenital) 743.36
- Microphthalmia (congenital) (see also Microphthalmos) 743.10
- Microphthalmos (congenital) 743.10
- Micropsia 368.14
- Microsporidiosis 136.8
- Microsporon furfur infestation 111.0
- Microsporosis (see also Dermatophytosis) 110.9
- Microstomia (congenital) 744.84
- Microthelia 757.6
- Microthromboembolism - see Embolism
- Microtia (congenital) (external ear) 744.23
- Microtropia 378.34
- Micturition
- Middle
- Midplane - see condition
- Miescher's disease 709.3
- Miescher-Leder syndrome or granulomatosis 709.3
- Mieten's syndrome 759.89
