- Q fever 083.0
- Quadricuspid aortic valve 746.89
- Quadrilateral fever 083.0
- Quadriparesis - see Quadriplegia
- Quadriplegia 344.00
- Quadruplet
- Quarrelsomeness 301.3
- Quartan
- Queensland fever 083.0
- Quervain's disease 727.04
- Queyrat's erythroplasia (M8080/2)
- Quincke's disease or edema - see Edema, angioneurotic
- Quinquaud's disease (acne decalvans) 704.09
- Quinsy (gangrenous) 475
- Quintan fever 083.1
- Quintuplet
- Quotidian
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