- Glomangiosarcoma (M8710/3) - see Neoplasm, connective tissue, malignant
- Glomerular nephritis (see also Nephritis) 583.9
- Glomerulitis (see also Nephritis) 583.9
- Glomerulonephritis (see also Nephritis) 583.9
- Glomerulosclerosis (see also Sclerosis, renal) 587
- Glossagra 529.6
- Glossalgia 529.6
- Glossitis 529.0
- Glossocele 529.8
- Glossodynia 529.6
- Glossoncus 529.8
- Glossophytia 529.3
- Glossoplegia 529.8
- Glossoptosis 529.8
- Glossopyrosis 529.6
- Glossotrichia 529.3
- Glossy skin 701.9
- Glottis - see condition
- Glottitis - see Glossitis
- Glucagonoma (M8152/0)
- Glucoglycinuria 270.7
- Glue ear syndrome 381.20