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2007 ICD-9-CM Volume 1 Diagnosis Codes Home > Endocrine, Nutritional And Metabolic Diseases, And Immunity Disorders 240-279 > Diseases Of Other Endocrine Glands 250-259 > Disorders Of Adrenal Glands 255.* > 2007 ICD-9-CM Diagnosis 255.12 Conn's syndrome  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 Therefore, this code may be out of date.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 255.12 can be accessed here. Primary hyperaldosteronism caused by the excess production of ALDOSTERONE by an ADENOMA of the ZONA GLOMERULOSA or CONN ADENOMA. 255.12 is a specific code that can be used to specify a diagnosis 255.12 contains 2 index entries View the ICD-9-CM Volume 1 255.* hierarchy Index entries containing 255.12: Conn (-Louis) syndrome (primary aldosteronism) 255.12 Syndrome - see also Disease Conn (-Louis) (primary aldosteronism) 255.12