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2008 ICD-9-CM Volume 1 Diagnosis Codes Home > Injury And Poisoning 800-999 > Complications Of Surgical And Medical Care, Not Elsewhere Classified 996-999 > Complications Affecting Specified Body System Not Elsewhere Classified 997.* > 2008 ICD-9-CM Diagnosis 997.00 Nervous system complication unspecified  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 Therefore, this code may be out of date.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 997.00 can be accessed here. 997.00 is a specific code that can be used to specify a diagnosis 997.00 contains 3 index entries View the ICD-9-CM Volume 1 997.* hierarchy Index entries containing 997.00: Complications medical care NEC 999.9 nervous system NEC 997.00 nervous system postoperative NEC 997.00 surgical procedures 998.9 nervous system NEC 997.00