Specific code 2013 ICD-9-CM Diagnosis Code 273.4
Alpha-1-antitrypsin deficiency
  • Short description: Alpha-1-antitrypsin def.
  • ICD-9-CM 273.4 is a billable medical code that can be used to indicate a diagnosis on a reimbursement claim, however, 273.4 should only be used for claims with a date of service on or before September 30, 2015. For claims with a date of service on or after October 1, 2015, use an equivalent ICD-10-CM code (or codes).
  • You are viewing the 2013 version of ICD-9-CM 273.4.
  • More recent version(s) of ICD-9-CM 273.4: 2014 2015.
Convert to ICD-10-CM: 273.4 converts directly to:
  • 2015/16 ICD-10-CM E88.01 Alpha-1-antitrypsin deficiency
Approximate Synonyms
  • Alpha 1 antitrypsin deficiency
Applies To
  • AAT deficiency
ICD-9-CM Volume 2 Index entries containing back-references to 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
      • protein (congenital) 273.8
ICD-9-CM codes are used in medical billing and coding to describe diseases, injuries, symptoms and conditions. ICD-9-CM 273.4 is one of thousands of ICD-9-CM codes used in healthcare. Although ICD-9-CM and CPT codes are largely numeric, they differ in that CPT codes describe medical procedures and services. Can't find a code? Start at the root of ICD-9-CM, check the 2013 ICD-9-CM Index or use the search engine at the top of this page to lookup any code.