Is A85.2 a billable ICD-10-CM code?

Yes. A85.2 is a billable, specific ICD-10-CM code and is valid for submission on a claim.

Where does A85.2 sit in the tabular list?

Certain infectious and parasitic diseases (A00-B99), in the block Viral and prion infections of the central nervous system (A80-A89).

What cannot be coded together with A85.2?

A85.2 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.

A85.2

A85.2 — Arthropod-borne viral encephalitis, unspecified

Billable / specific codeICD-10-CM

A85.2 is a billable, specific ICD-10-CM code for arthropod-borne viral encephalitis, unspecified. It is valid for submission on a claim.

Excludes1 — never code together

These conditions cannot occur together. Billing both on the same encounter is a denial.

West nile virus with encephalitis (A92.31)

Risk adjustment

A85.2 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.

Medicare coverage

A85.2 is named in 8 Medicare coverage policies — 8 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.

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

How A85.2 is indexed

Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to A85.2.

Encephalitis›arboviral, arbovirus NEC
Encephalitis›arthropod-borne NEC(viral)
Encephalitis›viral, virus›arthropod-borne NEC

Related codes at this level

Codes that share A85. If A85.2 is not quite right, the correct code is usually one of these.

Questions about A85.2

Is A85.2 a billable ICD-10-CM code?: Yes. A85.2 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does A85.2 sit in the tabular list?: Certain infectious and parasitic diseases (A00-B99), in the block Viral and prion infections of the central nervous system (A80-A89).
What cannot be coded together with A85.2?: A85.2 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.