- Molarization, premolars 520.2
- Mold(s) in vitreous 117.9
- Molding, head (during birth) - omit code
- Mole (pigmented) (M8720/0) - see also Neoplasm, skin, benign
- Molimen, molimina (menstrual) 625.4
- Mollaret's meningitis 047.9
- Mollities (cerebellar) (cerebral) 437.8
- Molluscum
- Mönckeberg's arteriosclerosis, degeneration, disease, or sclerosis (see also Arteriosclerosis, extremities) 440.20
- Monday fever 504
- Monday morning dyspnea or asthma 504
- Mondini's malformation (cochlea) 744.05
- Mondor's disease (thrombophlebitis of breast) 451.89
- Mongolian, mongolianism, mongolism, mongoloid 758.0
- Monilethrix (congenital) 757.4
- Monilia infestation - see Candidiasis
- Moniliasis - see also Candidiasis
- Monkeypox 059.01
- Monoarthritis 716.60
- Monoblastic - see condition
- Monochromatism (cone) (rod) 368.54
- Monocytic - see condition