ICD-10-CM 2027 diagnosis code
B34.2Coronavirus infection, unspecified
B34.2 is a valid, billable ICD-10-CM code for coronavirus infection, unspecified. 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 B34.2
B34.2 is the ICD-10-CM diagnosis code for coronavirus infection, unspecified. It belongs to category B34 (viral infection of unspecified site), block B25-B34 (other viral diseases) 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 B34, choose B34.2 (Coronavirus infection, unspecified) only when documentation doesn't support a more specific option: adenovirus infection, unspecified (B34.0), enterovirus infection, unspecified (B34.1), Parvovirus infection, unspecified (B34.3), Papovavirus infection, unspecified (B34.4), other viral infections of unspecified site (B34.8) and viral infection, unspecified (B34.9).
Don't report B34.2 together with the conditions in its Excludes1 note: COVID-19 (U07.1) and pneumonia due to SARS-associated coronavirus (J12.81).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 865 (Viral Illness with MCC, relative weight 1.3485) and DRG 866 (Viral Illness without MCC, relative weight 0.8692), in MDC 18 (Infectious and Parasitic Diseases, Systemic or Unspecified Sites), 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 079.89 (other specified viral infection).
Coding notes
Notes that apply from higher levels
Instructions written at a parent level also apply to B34.2.
Broader instructions also apply from Chapter 1: Certain infectious and parasitic diseases.
Alphabetic index entries
1 entriesTerms in the official ICD-10-CM index that lead to B34.2.
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.
MDC 18 · Infectious and Parasitic Diseases, Systemic or Unspecified Sites
ICD-9-CM equivalent
Converter →- 079.89Other specified viral infectionapproximate
From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
- No changes since FY2016.
Common questions about B34.2
Is B34.2 billable?
- Yes. B34.2 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can B34.2 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict B34.2 as a principal diagnosis.
Is B34.2 a CC or MCC?
- No. B34.2 is neither a CC nor an MCC under MS-DRG v44.0.
What DRG does B34.2 group to?
- B34.2 is used in the MS-DRG v44.0 logic for MS-DRG 865 (Viral Illness with MCC) and MS-DRG 866 (Viral Illness without 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 B34.2?
- The CMS General Equivalence Mappings map B34.2 to ICD-9-CM 079.89.