A83 ICD-10-CM Code: Mosquito-borne viral encephalitis
A clear reference for the official code description, hierarchy, and related coding information from the FY 2027 U.S. release.
Code definition
Official description
A83Mosquito-borne viral encephalitis
ICD-10-CM diagnosis code · United States clinical modification
Classification
Where A83 sits
- 1
Chapter 1
Certain infectious and parasitic diseases (A00-B99)
- 2
Section
Viral and prion infections of the central nervous system (A80-A89)
- 3
Category A83
Mosquito-borne viral encephalitis
- 4
Code A83
Mosquito-borne viral encephalitis
More specific choices
Codes under A83
A83 is a non-billable category. Choose the child code that best matches the documented diagnosis.
Documentation details
Notes for this code
Inclusion terms
No inclusion terms are listed for A83.
Code first
No “code first” instruction is listed for A83.
Use additional code
No “use additional code” instruction is listed for A83.
Excludes1
Conditions that should not be reported together with this code.
No Excludes1 note is listed for A83.
Excludes2
Conditions not included here that may be reported separately when present.
- Venezuelan equine encephalitis (A92.2)
- West Nile fever (A92.3-)
- West Nile virus (A92.3-)
Transparency
Source and release
This reference is generated from Vero’s ICD-10-CM description, hierarchy, and code-note dataset. The visible content and structured data share that source.
Review the CDC/NCHS ICD-10-CM sourceCode-specific guidance
Frequently asked questions
What does ICD-10-CM code A83 mean?
A83 is the FY 2027 U.S. ICD-10-CM code for “Mosquito-borne viral encephalitis.”
Is A83 a billable or specific ICD-10-CM code?
No. A83 has more specific child codes in the FY 2027 reference data. Select the code that matches the documentation and confirm the active code set and payer requirements.
Where is A83 located in ICD-10-CM?
A83 is listed in Chapter 1, Certain infectious and parasitic diseases (A00-B99), within Viral and prion infections of the central nervous system (A80-A89) (A80–A89), under category A83, Mosquito-borne viral encephalitis.
What coding notes are listed for A83?
No inclusion terms are listed for A83 in this reference record. No code-first instruction is listed. No Excludes1 note is listed. Excludes2 notes: Venezuelan equine encephalitis (A92.2); West Nile fever (A92.3-); West Nile virus (A92.3-).
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