A85.8

A85.8: Other specified viral encephalitis

Billable / specific codeICD-10-CM

A85.8 is a billable, specific ICD-10-CM code for other specified viral encephalitis. It is valid for submission on a claim.

Check A85.8 with the rest of the claim: free scrubber

Inclusion terms

Alternative wordings a physician may use in the chart for this same code.

Encephalitis lethargica
Von Economo-Cruchet disease

Excludes1 inherited from the categories above A85.8

A category’s note binds every code beneath it.

Written on A85: Other viral encephalitis, not elsewhere classified

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)

Risk adjustment

No CMS-HCC V28 category: this code does not change a RAF score.

Medicare coverage

A85.8 is named in 9 Medicare coverage policies: 9 listing it as supporting medical necessity. Which one applies depends on your Medicare contractor.

A56612Billing and Coding: CT of the Head
A56718Billing and Coding: Intravenous Immunoglobulin (IVIG)
A56771Billing and Coding: Special Electroencephalography
A57204Billing and Coding: MRI and CT Scans of the Head and Neck

Alphabetic index entries that lead here

Cruchet's disease
Economo's disease
Von Economo-Cruchet disease
Encephalitis›lethargica(acute) (infectious)
Encephalitis›Mengo
Encephalitis›Rio Bravo
Encephalitis›Vienna
Encephalitis›acute›inclusion body
Encephalitis›viral, virus›specified type NEC

Code history

Unchanged in every release from FY2024 to FY2027.