subjectively experienced sensations in the absence of an appropriate stimulus, but which are regarded by the individual as real; may be of organic origin, drug induced, or associated with a mental disorder.
Perceptions through any sense modality in the absence of an appropriate stimulus. (Usually indicative of abnormality but may be experienced occasionally by normal persons).
A false sensory perception in the absence of an external stimulus, as distinct from an illusion which is a misperception of an external stimulus.
Excludes
those associated with mental disorders, as functional psychoses (295.0-298.9)
2009 ICD-9-CM Diagnosis Code 780.1
780.1