- Liquefaction, vitreous humor 379.21
- Lisping 307.9
- Lissauer's paralysis 094.1
- Lissencephalia, lissencephaly 742.2
- Listerellose 027.0
- Listeriose 027.0
- Listeriosis 027.0
- Listlessness 780.79
- Lithemia 790.6
- Lithiasis - see also Calculus
- Lithopedion 779.9
- Lithosis (occupational) 502
- Lithuria 791.9
- Litigation V62.5
- Little
- Little's disease - see Palsy, cerebral
- Littre's
- Littritis (see also Urethritis) 597.89
- Live flesh 781.0
- Livedo 782.61
- Liver - see also condition
- Livida, asphyxia