| ICD9 = | ICDO = | DiseasesDB = 8478 | OMIM = 246300 | MedlinePlus = 001347 | eMedicineSubj = med | eMedicineTopic = 1281 | eMedicine_mult = | MeshName = Leprosy | MeshNumber = C01.252.410.040.552.386 |}}Leprosy, or Hansen's disease, is a chronic infectious disease caused by the bacterium Mycobacterium leprae. Leprosy is primarily a granulomatous disease of the peripheral nerves and mucosa of the upper respiratory tract; skin lesions are the prim