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2008 ICD-9-CM Volume 1 Diagnosis Codes Home > Diseases Of The Digestive System 520-579 > Noninfective Enteritis And Colitis 555-558 > Ulcerative Enterocolitis 556.* > 2008 ICD-9-CM Diagnosis 556.4 Pseudopolyposis of colon  On October 1, 2008 the 2009 ICD-9-CM codes came into effect. Therefore, this code may be out of date. The 2009 version of ICD-9-CM 556.4 can be accessed here. 556.4 is a specific code that can be used to specify a diagnosis 556.4 contains 1 index entry View the ICD-9-CM Volume 1 556.* hierarchy Index entries containing 556.4: Pseudopolyposis, colon 556.4