2026 ICD-10-CM Diagnosis Code B25Cytomegaloviral disease

ICD-10-CM Codes›A00–B99›B25-B34›B25

ICD-10-CM B25
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

B25 is a non-billable ICD-10-CM category code for cytomegaloviral disease, so it cannot be submitted on claims. Use a more specific code from this category instead, such as B25.0, B25.1, B25.2, and B25.8.

Code Identity

ICD-10-CM Code
B25
Billable Status
No — Non-Billable Category
Code Describes
Cytomegaloviral disease
Chapter
B25-B34
Other viral diseases

Code Classification

ChapterA00–B99Certain infectious and parasitic diseases
SectionB25-B34Other viral diseases
CategoryB25Cytomegaloviral disease
This CodeB25Cytomegaloviral disease

Specific Coding for Cytomegaloviral diseaseOverview

Non-specific codes like B25 require more characters. Use one of these billable codes instead:

  • Use B25.0 for Cytomegaloviral pneumonitis

  • Use B25.1 for Cytomegaloviral hepatitis

  • Use B25.2 for Cytomegaloviral pancreatitis

  • Use B25.8 for Other cytomegaloviral diseases

  • Use B25.9 for Cytomegaloviral disease, unspecified

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Type 1 Excludes

  • congenital cytomegalovirus infection P35.1
  • cytomegaloviral mononucleosis B27.1

Patient EducationClinical

Cytomegalovirus Infections

Cytomegalovirus (CMV) is a virus found around the world. It is related to the viruses that cause chickenpox and infectious mononucleosis (mono). Between 50% and 80% of adults in the United States have had a CMV infection by age 40. Once CMV is in a person's body, it stays there for life.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About B25Overview

Is B25 (Cytomegaloviral disease) a billable code?

No. This is a category header that groups the codes for cytomegaloviral disease, and headers cannot be submitted on claims. Claims for cytomegaloviral disease need a more specific code from this category, such as B25.0, B25.1, and B25.2.