2026 ICD-10-CM Diagnosis Code B05Measles

ICD-10-CM Codes›A00–B99›B00-B09›B05

ICD-10-CM B05
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

B05 is a non-billable ICD-10-CM category code for measles, so it cannot be submitted on claims. Use a more specific code from this category instead, such as B05.0, B05.1, B05.2, and B05.3.

Code Identity

ICD-10-CM Code
B05
Billable Status
No — Non-Billable Category
Code Describes
Measles
Chapter
B00-B09
Viral infections characterized by skin and mucous membrane lesions

Code Classification

ChapterA00–B99Certain infectious and parasitic diseases
SectionB00-B09Viral infections characterized by skin and mucous membrane lesions
CategoryB05Measles
This CodeB05Measles

Specific Coding for MeaslesOverview

Non-specific codes like B05 require more characters. Use one of these billable codes instead:

  • Use B05.0 for Measles complicated by encephalitis

  • Use B05.1 for Measles complicated by meningitis

  • Use B05.2 for Measles complicated by pneumonia

  • Use B05.3 for Measles complicated by otitis media

  • Use B05.4 for Measles with intestinal complications

  • B05.8 for Measles with other complications

  • Use B05.81 for Measles keratitis and keratoconjunctivitis

  • Use B05.89 for Other measles complications

  • Use B05.9 for Measles without complication

Tabular List NotesGuidance

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

Includes

  • morbilli

Type 1 Excludes

  • subacute sclerosing panencephalitis A81.1

Clinical InformationClinical

  • Measles

    a highly contagious infectious disease caused by morbillivirus, common among children but also seen in the nonimmune of any age, in which the virus enters the respiratory tract via droplet nuclei and multiplies in the epithelial cells, spreading throughout the mononuclear phagocyte system.

  • Measles Vaccine

    a live attenuated virus vaccine of chick embryo origin, used for routine immunization of children and for immunization of adolescents and adults who have not had measles or been immunized with live measles vaccine and have no serum antibodies against measles. children are usually immunized with measles-mumps-rubella combination vaccine. (from dorland, 28th ed)

  • Measles virus

    the type species of morbillivirus and the cause of the highly infectious human disease measles, which affects mostly children.

  • Measles-Mumps-Rubella Vaccine

    a combined vaccine used to prevent measles; mumps; and rubella.

  • Rubella

    an acute infectious disease caused by the rubella virus. the virus enters the respiratory tract via airborne droplet and spreads to the lymphatic system.

  • Rubella virus

    the type (and only) species of rubivirus causing acute infection in humans, primarily children and young adults. humans are the only natural host. a live, attenuated vaccine is available for prophylaxis.

  • Subacute Sclerosing Panencephalitis

    a rare, slowly progressive encephalitis caused by chronic infection with the measles virus. the condition occurs primarily in children and young adults, approximately 2-8 years after the initial infection. a gradual decline in intellectual abilities and behavioral alterations are followed by progressive myoclonus; muscle spasticity; seizures; dementia; autonomic dysfunction; and ataxia. death usually occurs 1-3 years after disease onset. pathologic features include perivascular cuffing, eosinophilic cytoplasmic inclusions, neurophagia, and fibrous gliosis. it is caused by the sspe virus, which is a defective variant of measles virus. (from adams et al., principles of neurology, 6th ed, pp767-8)

  • Viral Fusion Proteins

    proteins, usually glycoproteins, found in the viral envelopes of a variety of viruses. they promote cell membrane fusion and thereby may function in the uptake of the virus by cells.

  • Rubivirus

    a genus of the family togaviridae containing only one recognized species, rubella virus. transmission is primarily by aerosolization.

Patient EducationClinical

Measles

Measles is an infectious disease caused by a virus. It spreads easily from person to person. It causes a blotchy red rash. The rash often starts on the head and moves down the body. Other symptoms include:

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 B05Overview

Is B05 (Measles) a billable code?

No. This is a category header that groups the codes for measles, and headers cannot be submitted on claims. Claims for measles need a more specific code from this category, such as B05.0, B05.1, and B05.2.