Alphabetic Index FY2027

B97

Viral agents as the cause of diseases classified elsewhere

FY2027Chapter 1: Certain infectious and parasitic diseases/B95–B97 Bacterial and viral infectious agents

Non-billable headerNot valid on its own. Use one of the more specific codes under it.

B97 is a non-billable ICD-10-CM code category for viral agents as the cause of diseases classified elsewhere. Report a more specific code from it instead. It is part of the FY2027 code set, effective October 1, 2026. The more specific codes under it are B97.0 Adenovirus as the cause of diseases classified elsewhere, B97.1 Enterovirus as the cause of diseases classified elsewhere, B97.2 Coronavirus as the cause of diseases classified elsewhere, B97.3 Retrovirus as the cause of diseases classified elsewhere and 5 more. Its coding notes include a Use additional code instruction and 5 Excludes2 entries.

Guidelines tip

From the FY2027 Official Guidelines. ICD10Ref adds no rules of its own.

When an infection is classified outside Chapter 1 and no organism is part of its code, an additional B95, B96 or B97 code identifies the organism.

Guidelines I.C.1.bOrganism codes for infections in other chaptersRead the official text

Use additional code

Add the listed code as a secondary code, if known.

Also from chapter/block level (1 note)
Inherited from Chapter 1 Certain infectious and parasitic diseases
  • code to identify resistance to antimicrobial drugs (Z16.-)

Excludes2

Not included here. Both codes may be reported if the patient has both conditions.

Also from chapter/block level (5 notes)
Inherited from Chapter 1 Certain infectious and parasitic diseases
  • carrier or suspected carrier of infectious disease (Z22.-)
  • certain localized infections - see body system-related chapters
  • 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)

Includes

Further defines or gives examples of the content of the category.

Also from chapter/block level (1 note)
Inherited from Chapter 1 Certain infectious and parasitic diseases
  • diseases generally recognized as communicable or transmissible

Notes

Also from chapter/block level (1 note)
Inherited from B95–B97 Bacterial and viral infectious agents
  • These categories are provided for use as supplementary or additional codes to identify the infectious agent(s) in diseases classified elsewhere.

More specific codes under B97 9