AHA Coding Clinic® for ICD-9 - 2004 Issue 4; VOLUMES 1 AND 2 NEW/REVISED DIAGNOSIS CODES

Alpha-1-Antitrypsin Deficiency

Effective October 1, 2004, a new code has been created for alpha-1-antitrypsin deficiency. Prior to this change, alpha-1-antitrypsin deficiency was assigned to code 277.6, Other deficiencies of circulating enzymes. It was determined that this was an incorrect code assignment since AAT is not an enzyme. Alpha-1-antitrypsin (AAT) is a protein produced by the liver and is designed to protect tissues. AAT deficiency is a genetic disorder characterized by the production of an abnormal AAT protein. When the abnormal AAT protein is produced, the liver cannot secrete AAT. This causes the protein to accumulate within the liver and results...

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