• Locomotor ataxia (progressive) 094.0
  • Löffler's
  • Löfgren's syndrome (sarcoidosis) 135
  • Loiasis 125.2
  • Lone star fever 082.8
  • Loneliness V62.89
  • Long labor 662.1
  • Long-term (current) (prophylactic) drug use V58.69
  • Longitudinal stripes or grooves, nails 703.8
  • Loop
  • Loose - see also condition
  • Loosening epiphysis 732.9
  • Looser (-Debray)-Milkman syndrome (osteomalacia with pseudofractures) 268.2
  • Lop ear (deformity) 744.29
  • Lorain's disease or syndrome (pituitary dwarfism) 253.3
  • Lorain-Levi syndrome (pituitary dwarfism) 253.3
  • Lordosis (acquired) (postural) 737.20
  • Loss
  • Lou Gehrig's disease 335.20
  • Louis-Bar syndrome (ataxia-telangiectasia) 334.8
  • Louping ill 063.1
  • Lousiness - see Lice