ICD-9-CM diagnosis code (retired)
273.4 — Alpha-1-antitrypsin deficiency
ICD-9-CM was replaced by ICD-10 on October 1, 2015. These are the ICD-10-CM equivalents from the CMS General Equivalence Mappings.
About ICD-9-CM 273.4
273.4 is an ICD-9-CM diagnosis code for Alpha-1-antitrypsin deficiency. ICD-9-CM was retired for U.S. claims on October 1, 2015, when ICD-10-CM took over.
The CMS General Equivalence Mappings translate it to one ICD-10-CM code, E88.01 (Alpha-1-antitrypsin deficiency). The match is exact.
ICD-10-CM equivalents
- E88.01Alpha-1-antitrypsin deficiencyexact match
Common questions about 273.4
What is the ICD-10 code for ICD-9 273.4?
- The GEMs map 273.4 to ICD-10-CM E88.01.
GEMs are a translation aid, not a substitute for coding from the record. The 2027 ICD-10 code set has changed since the last GEMs release in 2018. Page updated September 29, 2026.