2006 ICD-9-CM Volume 1 Diagnosis Codes Home > Endocrine, Nutritional And Metabolic Diseases, And Immunity Disorders 240-279 > Nutritional Deficiencies 260-269 > 2006 ICD-9-CM Diagnosis 265 Thiamine and niacin deficiency states View the most recent version of ICD-9-CM 265 265 is a non-specific code that cannot be used to specify a diagnosis