- Labyrinthitis
- Lacrimal Disorders
- Lactose Dehydrogenase Elevation (algorithm)
- Lactose Intolerance
- Laryngeal Cancer
- Laryngitis
- Laxative Abuse
- Lead Poisoning
- Legg-Calve-Perthes Disease
- Legionnaires' Disease
- Leg Ulcer (algorithm)
- Leukemia, Acute Lymphoblastic in Adults (ALL)
- Leukemia, Acute Myeloid
- Leukemia, Chronic Lymphocytic
- Leukemia, Chronic Myelogenous
- Leukopenia (algorithm)
- Leukoplakia, Oral
- Lichen Planus
- Lichen Simplex Chronicus
- Lipoma
- Low Back Pain, Acute (algorithm)
- Low Back Pain, Chronic (algorithm)
- Lumbar (Intervertebral) Disc Disorders
- Lung, Primary Malignancies
- Lupus Erythematosus, Discoid
- Lupus Erythematosus, Systemic (SLE)
- Lupus Nephritis
- Lyme Disease
- Lymphadenopathy (algorithm)
- Lymphangitis
- Lymphedema
- Lymphoma, Burkitt
5-Minute Clinical Consult