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2008 ICD-9-CM Volume 1 Diagnosis Codes Home > Symptoms, Signs, And Ill-Defined Conditions 780-799 > Symptoms 780-789 > General Symptoms 780.* > 2008 ICD-9-CM Diagnosis 780.1 Hallucinations A hallucination is a false sensory perception in the absence of an external stimulus, as distinct from an illusion which is a misperception of an external stimulus. (from Wikipedia) Subjectively experienced sensations in the absence of an appropriate stimulus, but which are regarded by the individual as real. They may be of organic origin or associated with MENTAL DISORDERS. 780.1 is a specific code that can be used to specify a diagnosis 780.1 contains 5 index entries View the ICD-9-CM Volume 1 780.* hierarchy 780.1 also known as: Hallucinations: NOS auditory gustatory olfactory tactile 780.1 excludes: those associated with mental disorders, as functional psychoses (295.0-298.9) organic brain syndromes (290.0-294.9, 310.0-310.9) visual hallucinations (368.16) Index entries containing 780.1: Acousma 780.1 Gustatory hallucination 780.1 Hallucination (auditory) (gustatory) (olfactory) (tactile) 780.1 alcohol-induced 291.3 drug-induced 292.12 visual 368.16 Pseudohallucination 780.1 State hallucinatory 780.1 induced by drug 292.12