ICD-9-CM diagnosis code (retired)
807.4 — Flail chest
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 807.4
807.4 is an ICD-9-CM diagnosis code for Flail chest. 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 2 ICD-10-CM codes, such as S22.5XXA (Flail chest, initial encounter for closed fracture) and S22.5XXB (Flail chest, initial encounter for open fracture). All of these are approximate matches, so review the record to pick the right one.
ICD-10-CM equivalents
Common questions about 807.4
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.