ICD-10 Code for Fahr Disease

The default ICD-10-CM 2027 code for fahr disease (of brain) is G23.8 – Other specified degenerative diseases of basal ganglia. More specific codes depend on the details documented, as listed in the official index (1 codes, 1 billable).

Main code
G23.8 – Other specified degenerative diseases of basal ganglia
Billable
Yes

How to choose the right code

Start with the main term, then pick the indented subterm that matches the documentation (type, cause, site, laterality, episode of care). Always confirm the code in the tabular list: follow its Excludes1/Excludes2, “code first” and “use additional code” notes, and add a 7th character where required.

Source: CDC/NCHS ICD-10-CM FY2027 alphabetic index.