- Melalgia, nutritional 266.2
- Melancholia (see also Psychosis, affective) 296.90
- Melanemia 275.09
- Melanoameloblastoma (M9363/0) - see Neoplasm, bone, benign
- Melanoblastoma (M8720/3) - see Melanoma
- Melanoblastosis
- Melanocarcinoma (M8720/3) - see Melanoma
- Melanocytoma, eyeball (M8726/0) 224.0
- Melanocytosis, neurocutaneous 757.33
- Melanoderma, melanodermia 709.09
- Melanodontia, infantile 521.05
- Melanodontoclasia 521.05
- Melanoepithelioma (M8720/3) - see Melanoma
- Melanoma (malignant) (M8720/3) 172.9
- Melanoplakia 528.9
- Melanosarcoma (M8720/3) - see also Melanoma
- Melanosis 709.09
- Melanuria 791.9
- MELAS syndrome (mitochondrial encephalopathy, lactic acidosis and stroke-like episodes) 277.87
- Melasma 709.09
- Melena 578.1
- Meleney's
