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2008 ICD-9-CM Volume 1 Diagnosis Codes Home > Endocrine, Nutritional And Metabolic Diseases, And Immunity Disorders 240-279 > Other Metabolic Disorders And Immunity Disorders 270-279 > Disorders Of Plasma Protein Metabolism 273.* > 2008 ICD-9-CM Diagnosis 273.4 Alpha-1-antitrypsin deficiency  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 Therefore, this code may be out of date.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 273.4 can be accessed here. Deficiency of the protease inhibitor ALPHA 1-ANTITRYPSIN, leading primarily to degradation of elastin of the alveolar walls, as well as other structural proteins of a variety of tissues. (From Scriver, Beaudet, Sly, & Valle, The Metabolic and Molecular Bases of Inherited Disease, 7th ed, p4125) 273.4 is a specific code that can be used to specify a diagnosis 273.4 contains 6 index entries View the ICD-9-CM Volume 1 273.* hierarchy 273.4 also known as: AAT deficiency Index entries containing 273.4: AAT (alpha-1 antitrypsin) deficiency 273.4 Deficiency, deficient AAT (alpha-1 antitrypsin) 273.4 alpha-1-antitrypsin 273.4 alpha-1-trypsin inhibitor 273.4 antitrypsin 273.4 serum antitrypsin, familial 273.4