ICD-9-CM diagnosis code (retired)
851.04 — Cortex (cerebral) contusion without mention of open intracranial wound, with prolonged [more than 24 hours] loss of consciousness and return to pre-existing conscious level
About ICD-9-CM 851.04
851.04 is an ICD-9-CM diagnosis code for cortex (cerebral) contusion without mention of open intracranial wound, with prolonged [more than 24 hours] loss of consciousness and return to pre-existing conscious level. 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, S06.335A (Contusion and laceration of cerebrum, unspecified, with loss of consciousness greater than 24 hours with return to pre-existing conscious level, initial encounter). The match is approximate, so confirm it against the record.
ICD-10-CM equivalents
- S06.335AContusion and laceration of cerebrum, unspecified, with loss of consciousness greater than 24 hours with return to pre-existing conscious level, initial encounterapproximate
Common questions about 851.04
What is the ICD-10 code for ICD-9 851.04?
- The GEMs map 851.04 to ICD-10-CM S06.335A.
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.