ICD-9-CM diagnosis code (retired)
993.9 — Unspecified effect of air pressure
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 993.9
993.9 is an ICD-9-CM diagnosis code for unspecified effect of air pressure. 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, T70.9XXA (Effect of air pressure and water pressure, unspecified, initial encounter). The match is approximate, so confirm it against the record.
ICD-10-CM equivalents
- T70.9XXAEffect of air pressure and water pressure, unspecified, initial encounterapproximate
Common questions about 993.9
What is the ICD-10 code for ICD-9 993.9?
- The GEMs map 993.9 to ICD-10-CM T70.9XXA.
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.