A83.3
✓ Billable
St Louis encephalitis
ICD-10-CM · FY2026 · Certain Infectious and Parasitic Diseases
Code
A83.3
System
ICD-10-CM
Billable
Yes — valid for submission
Effective
FY2026
Chapter
Certain Infectious and Parasitic Diseases
Source
CMS / CDC NCHS
⚠ Verify before billing. Confirm against the current CMS/NCHS ICD-10-CM files and your payer's rules before claims submission.
Frequently asked questions
What is ICD-10 code A83.3?
ICD-10-CM code A83.3 represents St Louis encephalitis. It is a billable diagnosis code in the Certain Infectious and Parasitic Diseases chapter, effective October 1, 2025 – September 30, 2026.
Is A83.3 billable?
Yes. A83.3 is a valid billable ICD-10-CM code for insurance claims and clinical documentation.
What chapter is A83.3 in?
A83.3 belongs to the Certain Infectious and Parasitic Diseases chapter (A00–B99) of ICD-10-CM.
Related codes in the A83 category
A83
Mosquito-borne viral encephalitis
Non-billable
A83.0
Japanese encephalitis
Billable
A83.1
Western equine encephalitis
Billable
A83.2
Eastern equine encephalitis
Billable
A83.4
Australian encephalitis
Billable
A83.5
California encephalitis
Billable
A83.6
Rocio virus disease
Billable
A83.8
Other mosquito-borne viral encephalitis
Billable
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