Diagnosaurus
- Lactase deficiency
- Lactic acidosis
- Larva migrans, visceral
- Laryngeal tumor
- Laryngitis
- LDL increased
- Lead poisoning
- Legionnaire's disease
- Leg ischemia
- Leg ulcers
- Leiomyomas, uterine
- Leishmaniasis
- Leprosy
- Leptospirosis
- Leukemia, acute
- Leukemia, chronic lymphocytic
- Leukemia, chronic myelogenous
- Leukemia, hairy cell
- Leukoplakia
- Libido decreased, men
- Libido decreased, women
- Lice
- Lichen planus
- Lichen planus, oral
- Lichen simplex chronicus
- Limb ischemia, acute
- Lipids increased
- Liver, cirrhosis
- Liver, fatty
- Liver abscess
- Liver abscess, amebic
- Liver cancer
- Liver disease, general categories
- Liver failure, acute
- Liver fluke, Chinese
- Liver fluke, sheep
- Liver metastases
- Loiasis (Loa loa infection)
- Long QT syndrome
- Lower extremity ischemia
- Lower extremity occlusive disease
- Lower extremity ulcer
- Lower GI bleeding
- Lower lobe lung disease
- Lung abscess
- Lung cancer
- Lung cancer, secondary
- Lung cavities, multiple
- Lung cavity
- Lung disease, drug-induced
- Lung disease, interstitial
- Lung disease, lower lobe
- Lung disease, upper lobe
- Lung fluke
- Lung metastases
- Lupus, drug-induced
- Lupus erythematosus, discoid
- Lupus erythematosus, systemic
- Lyme disease
- Lymphangitis
- Lymphatic filariasis
- Lymphedema
- Lymphogranuloma venereum
- Lymphoma, cutaneous T cell
- Lymphoma, Hodgkin's
- Lymphoma, non-Hodgkin's