DO_infectious_disease_slim leech infestation ICD10CM:B88.3 SNOMEDCT_US_2025_09_01:154423006 ICD9CM:134.2 A parasitic ectoparasitic infectious disease that involves parasitic infestation by members of the subclass Hirudinea. The leeches remain attached to their hosts and feed on blood until they become full, at which point they fall off to digest. While feeding, they release an anesthetic and use a combination of mucus and suction to stay attached and secrete an anti-clotting enzyme, hirudin, into the host's blood stream. UMLS_CUI:C0019575 disease_ontology DOID:11079 Hirudiniasis Leeches parasitic ectoparasitic infectious disease