2006 ICD-9-CM Volume 1 Diagnosis Codes Home > Endocrine, Nutritional And Metabolic Diseases, And Immunity Disorders 240-279 > Nutritional Deficiencies 260-269 > ICD-9-CM Diagnosis 265 Thiamine and niacin deficiency states 265 is a non-specific code that cannot be used to specify a diagnosis ICD-9-CM Diagnosis 265.0 Beriberi A disease caused by a deficiency of thiamine (vitamin B1) and characterized by polyneuritis, cardiac pathology, and edema. The epidemic form is found primarily in areas in which white (polished) rice is the staple food, as in Japan, China, the Philippines, India, and other countries of southeast Asia. 265.0 is a specific code that can be used to specify a diagnosis 265.0 contains 9 index entries ICD-9-CM Diagnosis 265.1 Other and unspecified manifestations of thiamine deficiency 265.1 is a specific code that can be used to specify a diagnosis 265.1 contains 19 index entries ICD-9-CM Diagnosis 265.2 Pellagra 265.2 is a specific code that can be used to specify a diagnosis 265.2 contains 22 index entries