ICD-9-CM diagnosis code (retired)
310.9 — Unspecified nonpsychotic mental disorder following organic brain damage
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 310.9
310.9 is an ICD-9-CM diagnosis code for unspecified nonpsychotic mental disorder following organic brain damage. 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, F09 (Unspecified mental disorder due to known physiological condition). The match is approximate, so confirm it against the record.
ICD-10-CM equivalents
- F09Unspecified mental disorder due to known physiological conditionapproximate
Common questions about 310.9
What is the ICD-10 code for ICD-9 310.9?
- The GEMs map 310.9 to ICD-10-CM F09.
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.