ICD-10-CM
ICD-10 code for Neuritis (rheumatoid) serum: T80.69
The ICD-10-CM index points "Neuritis (rheumatoid) serum" to T80.69, Other serum reaction due to other serum. T80.69 is not billable on its own. Add the 7th character for the encounter, for example T80.69XA, Other serum reaction due to other serum, initial encounter.
Source: CDC ICD-10-CM FY2027 Alphabetic Index file dated June 16, 2026. Publisher page
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