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2007 ICD-9-CM Volume 1 Diagnosis Codes Home > Injury And Poisoning 800-999 > Complications Of Surgical And Medical Care, Not Elsewhere Classified 996-999 > Other Complications Of Procedures Not Elsewhere Classified 998.* > 2007 ICD-9-CM Diagnosis 998.6 Persistent postoperative fistula not elsewhere classified  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 Therefore, this code may be out of date.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 998.6 can be accessed here. 998.6 is a specific code that can be used to specify a diagnosis 998.6 contains 2 index entries View the ICD-9-CM Volume 1 998.* hierarchy Index entries containing 998.6: Complications surgical procedures 998.9 fistula (persistent postoperative) 998.6 Fistula (sinus) 686.9 postoperative, persistent 998.6