A84 ICD-10-CM Code: Tick-borne viral encephalitis
A clear reference for the official code description, hierarchy, and related coding information from the FY 2027 U.S. release.
Official description
A84Tick-borne viral encephalitis
ICD-10-CM diagnosis code · United States clinical modification
Where A84 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 A84
Tick-borne viral encephalitis
- 4
Code A84
Tick-borne viral encephalitis
Codes under A84
A84 is a non-billable category. Choose the child code that best matches the documented diagnosis.
Notes for this code
Inclusion terms
No inclusion terms are listed for A84.
Code first
No “code first” instruction is listed for A84.
Use additional code
No “use additional code” instruction is listed for A84.
Excludes1
Conditions that should not be reported together with this code.
No Excludes1 note is listed for A84.
Excludes2
Conditions not included here that may be reported separately when present.
No Excludes2 note is listed for A84.
Source and release
- Data release
- U.S. ICD-10-CM · FY 2027
- Effective date
- Oct 1, 2026
- Publisher
- Vero Scribe Inc.
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.
Frequently asked questions
What does ICD-10-CM code A84 mean?
A84 is the FY 2027 U.S. ICD-10-CM code for “Tick-borne viral encephalitis.”
Is A84 a billable or specific ICD-10-CM code?
No. A84 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 A84 located in ICD-10-CM?
A84 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 A84, Tick-borne viral encephalitis.
What coding notes are listed for A84?
No inclusion terms are listed for A84 in this reference record. No code-first instruction is listed. No Excludes1 note is listed. No Excludes2 note is listed.