ICD-9-CM diagnosis code (retired)
033.1 — Whooping cough due to bordetella parapertussis [B. parapertussis]
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 033.1
033.1 is an ICD-9-CM diagnosis code for whooping cough due to bordetella parapertussis [B. parapertussis]. 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, A37.10 (Whooping cough due to Bordetella parapertussis without pneumonia). The match is approximate, so confirm it against the record.
ICD-10-CM equivalents
- A37.10Whooping cough due to Bordetella parapertussis without pneumoniaapproximate
Common questions about 033.1
What is the ICD-10 code for ICD-9 033.1?
- The GEMs map 033.1 to ICD-10-CM A37.10.
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.