A83.5

A83.5: California encephalitis

Billable / specific codeICD-10-CM

A83.5 is a billable, specific ICD-10-CM code for california encephalitis. It is valid for submission on a claim.

Check A83.5 with the rest of the claim: free scrubber

Inclusion terms

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

California meningoencephalitis
La Crosse encephalitis

Excludes2 inherited from the categories above A83.5

Not part of this code, but both may be coded when both are present.

Written on A83: Mosquito-borne viral encephalitis

Venezuelan equine encephalitis (A92.2)
West Nile fever (A92.3-)
West Nile virus (A92.3-)

Risk adjustment

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

Medicare coverage

A83.5 is named in 5 Medicare coverage policies: 5 listing it as supporting medical necessity. Which one applies depends on your Medicare contractor.

A56612Billing and Coding: CT of the Head
A56771Billing and Coding: Special Electroencephalography
A56773Billing and Coding: Neurophysiology Evoked Potentials (NEPs)
A57204Billing and Coding: MRI and CT Scans of the Head and Neck

Alphabetic index entries that lead here

California›encephalitis
Encephalitis›California(virus)
Encephalitis›La Crosse
Meningoencephalitis›California
Encephalitis›viral, virus›arthropod-borne NEC›mosquito-borne›California virus

Code history

Unchanged in every release from FY2024 to FY2027.