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ICD-10-CM 2027 diagnosis code

A88.8Other specified viral infections of central nervous system

✓ Billable / specificCC — complication/comorbidity

A88.8 is a valid, billable ICD-10-CM code for other specified viral infections of central nervous system. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About A88.8

A88.8 is the ICD-10-CM diagnosis code for other specified viral infections of central nervous system. It belongs to category A88 (other viral infections of central nervous system, not elsewhere classified), block A80-A89 (viral and prion infections of the central nervous system) and chapter 1 (certain infectious and parasitic diseases). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within A88, choose A88.8 (Other specified viral infections of central nervous system) only when documentation doesn't support a more specific option: enteroviral exanthematous fever [Boston exanthem] (A88.0) and epidemic vertigo (A88.1).

As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.

In MS-DRG v44.0, it is part of the grouping logic for DRG 097 (Non-Bacterial Infection of Nervous System Except Viral Meningitis with MCC, relative weight 3.8226), DRG 098 (Non-Bacterial Infection of Nervous System Except Viral Meningitis with CC, relative weight 2.2706), DRG 099 (Non-Bacterial Infection of Nervous System Except Viral Meningitis without CC/MCC, relative weight 1.5256), DRG 974 (HIV with Major Related Condition with MCC, relative weight 3.0506), DRG 975 (HIV with Major Related Condition with CC, relative weight 1.3252) and DRG 976 (HIV with Major Related Condition without CC/MCC, relative weight 0.8124), in MDC 01 (Diseases and Disorders of the Nervous System) and MDC 25 (Human Immunodeficiency Virus Infections), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as 049.8 (other specified non-arthropod-borne viral diseases of central nervous system).

Notes that apply from higher levels

Instructions written at a parent level also apply to A88.8.

› From A88 Other viral infections of central nervous system, not elsewhere classified
Excludes1
  • viral encephalitis NOS (A86)
  • viral meningitis NOS (A87.9)

Broader instructions also apply from A80-A89 Viral and prion infections of the central nervous system and Chapter 1: Certain infectious and parasitic diseases.

Alphabetic index entries

4 entries

Terms in the official ICD-10-CM index that lead to A88.8.

MS-DRG v44.0 grouping

All DRGs →

Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.

ICD-9-CM equivalent

Converter →
  • 049.8Other specified non-arthropod-borne viral diseases of central nervous systemapproximate

From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about A88.8

Is A88.8 billable?

Yes. A88.8 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can A88.8 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict A88.8 as a principal diagnosis.

Is A88.8 a CC or MCC?

A88.8 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.

What DRG does A88.8 group to?

A88.8 is used in the MS-DRG v44.0 logic for MS-DRG 097 (Non-Bacterial Infection of Nervous System Except Viral Meningitis with MCC), MS-DRG 098 (Non-Bacterial Infection of Nervous System Except Viral Meningitis with CC), MS-DRG 099 (Non-Bacterial Infection of Nervous System Except Viral Meningitis without CC/MCC), MS-DRG 974 (HIV with Major Related Condition with MCC), MS-DRG 975 (HIV with Major Related Condition with CC) and MS-DRG 976 (HIV with Major Related Condition without CC/MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.

What is the ICD-9 code for A88.8?

The CMS General Equivalence Mappings map A88.8 to ICD-9-CM 049.8.