NCIthesaurus acute conjunctivitis pseudomembranous conjunctivitis DOID:11190 ICD9CM:372.04 UMLS_CUI:C0155144 SNOMEDCT_US_2025_09_01:267643002 disease_ontology ICD10CM:H10.22 NCI:C35196 A acute conjunctivitis which involves a fibrin-rich exudate formation on the surface of the conjunctiva. Infectious causes of pseudomembranes include Corynebacterium diphtheriae, streptococci, pneumococci, herpes simplex virus, adenovirus, Chlamydia and gonococci. Other causes include chemical (alkali) irritants, erythema multiforme, and ocular pemphigoid.