ICD-10-CM
ICD-10 code for Meningoencephalitis California: A83.5
The ICD-10-CM index points "Meningoencephalitis California" to A83.5, California encephalitis. A83.5 is a billable code.
Source: CDC ICD-10-CM FY2027 Alphabetic Index file dated June 16, 2026. Publisher page
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More specific codes in A83
A header groups codes and is not billed. A billable code is one you can report.
- A83Mosquito-borne viral encephalitisHeader
- A83.0Japanese encephalitisBillable
- A83.1Western equine encephalitisBillable
- A83.2Eastern equine encephalitisBillable
- A83.3St Louis encephalitisBillable
- A83.4Australian encephalitisBillable
- A83.5California encephalitisBillable
- A83.6Rocio virus diseaseBillable
- A83.8Other mosquito-borne viral encephalitisBillable
- A83.9Mosquito-borne viral encephalitis, unspecifiedBillable
Excludes2
Excludes2 means the other condition can be reported with this one when both are documented.
From A83. A note on a category applies to every code under it.
Related conditions
Related pages
- A83.5 code detailsNotes, nearby codes, CMS-HCC group
- Category A83Every code under it
- Chapter 1Certain infectious and parasitic diseases
- ICD-10 codes by conditionA to Z
- Check a list of ICD-10 codes
- Denial code CO-11Diagnosis does not support the procedure
- Denial code CO-146Diagnosis invalid for the date of service
- HCPCS Level II code lookup
Questions
What is the ICD-10 code for Meningoencephalitis California?
The ICD-10-CM index points "Meningoencephalitis California" to A83.5, California encephalitis. A83.5 is a billable code.
Is A83.5 billable?
Yes. A83.5 is a billable code in the FY2027 ICD-10-CM file. Use a more specific code when the record documents one.
What documentation notes apply to A83.5?
The CDC tabular list gives 3 Excludes2 notes (may be coded together when both are documented) for A83.5 and the categories above it. They are listed on this page.
What chapter is A83.5 in?
Chapter 1. Certain infectious and parasitic diseases.
When do ICD-10-CM codes change?
Every October 1, with the new fiscal year file. Some years add April 1 updates. This page uses the FY2027 file, effective October 1, 2026.