- Lambert-Eaton Myasthenic Syndrome (Eaton-Lambert Syndrome)
- Large Bowel Obstruction
- Left upper quadrant Abdominal Pain
- Left-lower quadrant Abdominal Pain
- Leg ulcers
- Leukocytoclastic vasculitis
- Leukocytosis
- Limited English proficient
- Liver Abscess
- Liver Disease in Pregnancy
- Liver Nodules
- Lower Extremity joint pain
- Lung abscess
- Lupus nephritis
- Lyme Disease
- Lymphadenopathy
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