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2007 ICD-9-CM Volume 1 Diagnosis Codes Home > Diseases Of The Respiratory System 460-519 > Other Diseases Of Upper Respiratory Tract 470-478 > ICD-9-CM Diagnosis 475 Peritonsillar abscess An abscess in the peritonsillar tissue extending into the tonsil capsule, resulting from suppuration of the tonsil. (Dorland, 27th ed) 475 is a specific code that can be used to specify a diagnosis 475 contains 17 index entries