Other viral infections of central nervous system, not elsewhere classified (A88) ICD-10-CM
The A88 code range covers other viral infections of central nervous system, not elsewhere classified with 4 ICD-10-CM diagnosis codes. 3 of them are billable and valid for claim submission in fiscal year 2026, and the category headers group them but cannot themselves be billed.
Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
Codes in the A88 Range 4 codes · 3 billable
About the A88 Code Range
ICD-10 code A88 covers a group of viral infections affecting the central nervous system (CNS) that are not classified elsewhere. These codes help identify specific viral diseases of the brain and nerves when other more common categories do not apply.
Under A88.0, the code is used for enteroviral exanthematous fever, also known as Boston exanthem or enteroviral exanthem, which is a viral illness manifesting with fever and rash involving the CNS. A88.1 is assigned to cases of epidemic vertigo, a condition linked to viral infection of the vestibular nerve causing dizziness and balance problems, sometimes called viral vestibular nerve disorder. The code A88.8 includes a broader range of other specified viral CNS infections, such as infections caused by enteroviruses, Coxsackievirus, echovirus, Epstein-Barr virus, measles virus, parvoviruses, and Cache Valley virus, all capable of invading the nervous system. These codes are specifically utilized when viral CNS infections are present but do not fit the criteria for other defined neuropathologies, making them essential for accurate identification and treatment planning in neurological viral diseases.
Questions About This Page
How many billable codes are in the A88 range?
Of the 4 codes in this range, 3 are billable and valid for claim submission from October 1, 2025 through September 30, 2026. Category header codes group them but cannot be reported on claims.
What does the A88 range classify?
The range classifies other viral infections of central nervous system, not elsewhere classified. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
