ICD-9-CM diagnosis code (retired)
851.00 — Cortex (cerebral) contusion without mention of open intracranial wound, unspecified state of consciousness
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 851.00
851.00 is an ICD-9-CM diagnosis code for cortex (cerebral) contusion without mention of open intracranial wound, unspecified state of consciousness. 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, S06.330A (Contusion and laceration of cerebrum, unspecified, without loss of consciousness, initial encounter). The match is approximate, so confirm it against the record.
ICD-10-CM equivalents
- S06.330AContusion and laceration of cerebrum, unspecified, without loss of consciousness, initial encounterapproximate
Common questions about 851.00
What is the ICD-10 code for ICD-9 851.00?
- The GEMs map 851.00 to ICD-10-CM S06.330A.
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.