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2008 ICD-9-CM Volume 1 Diagnosis Codes Home > Diseases Of The Digestive System 520-579 > Hernia Of Abdominal Cavity 550-553 > Inguinal Hernia 550.* > 2008 ICD-9-CM Diagnosis 550.91 Recurrent unilateral or unspecified inguinal hernia without obstruction or gangrene 550.91 is a specific code that can be used to specify a diagnosis View the ICD-9-CM Volume 1 550.* hierarchy