A85

Non-billable

Other viral encephalitis, not elsewhere classified

A85 is the ICD-10-CM code for Other viral encephalitis, not elsewhere classified. It is a non-billable category code — use a more specific child code such as A85.0 for billing.

Status
Header (non-billable)
Chapter
A00-B99
Subcodes
4
Edition
FY2026

A00-B99 Certain infectious and parasitic diseases

Includes

  • specified viral encephalomyelitis NEC
  • specified viral meningoencephalitis NEC

Excludes1 — not coded here

  • encephalitis due to cytomegalovirus (B25.8)
  • encephalitis due to herpesvirus NEC (B10.0-)
  • encephalitis due to herpesvirus [herpes simplex] (B00.4)
  • encephalitis due to measles virus (B05.0)
  • encephalitis due to mumps virus (B26.2)
  • encephalitis due to poliomyelitis virus (A80.-)
  • encephalitis due to zoster (B02.0)
  • lymphocytic choriomeningitis (A87.2)
  • myalgic encephalomyelitis (G93.32)

Frequently asked questions

What is ICD-10 code A85?
A85 is the ICD-10-CM code for "Other viral encephalitis, not elsewhere classified". It falls under A00-B99 Certain infectious and parasitic diseases.
Is A85 a billable code?
No — A85 is a non-billable header code. Use a more specific child code (such as A85.0) for billing.
What are the subcodes of A85?
A85 has 4 more specific child codes, including A85.0, A85.1, A85.2.
What is excluded from A85?
Excludes1 (not coded here): encephalitis due to cytomegalovirus (B25.8); encephalitis due to herpesvirus NEC (B10.0-); encephalitis due to herpesvirus [herpes simplex] (B00.4); encephalitis due to measles virus (B05.0).

Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.

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