A81

Non-billable

Atypical virus infections of central nervous system

Chapter 1: Certain infectious and parasitic diseases

Coding Guidance

A81 should not be used for reimbursement purposes as there are more specific codes below it that contain a greater level of detail. See Related Codes to drill down to more specific billable codes for appropriate reimbursement.

Additional Information

From parent codes: A00-B99 (Chapter 1)

IncludesFrom A00-B99

Conditions included in this code from parent codes.

diseases generally recognized as communicable or transmissible

Excludes 1 — Not Coded HereFrom A00-B99

Excludes1 means 'NOT CODED HERE!' An Excludes1 note indicates mutually exclusive codes: two conditions that cannot be reported together.

certain localized infections - see body system-related chapters

Excludes 2 — Not Included HereFrom A00-B99

Excludes2 means 'NOT INCLUDED HERE!' An Excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time.

carrier or suspected carrier of infectious disease (Z22.-)
infectious and parasitic diseases complicating pregnancy, childbirth and the puerperium (O98.-)
infectious and parasitic diseases specific to the perinatal period (P35-P39)
influenza and other acute respiratory infections (J00-J22)

Use Additional CodeFrom A00-B99

The 'use additional code' note instructs that a secondary code should be added to provide more detail.