ICD-10-CM Code For Measles: Group Overview

The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group B05 includes measles and its specified forms, including uncomplicated measles and measles with complications such as pneumonia, encephalitis, and otitis media. These ICD-10-CM diagnosis codes are used to document acute measles infections, the presence or absence of complications, and the extent of organ system involvement to reflect clinical complexity. Accurate coding within the ICD-10-CM B05 group supports proper claim adjudication and complete clinical documentation for appropriate reimbursement.

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ICD-10-CM B05: Measles Overview

The diagnoses in this group represent measles, an acute viral infection characterized by fever, cough, conjunctivitis, coryza, and a maculopapular rash affecting the skin and mucous membranes. These codes target infectious disease coding for a systemic viral exanthem and related complications involving respiratory and neurologic systems. Accurate coding matters for appropriate clinical documentation and for reimbursement because it captures disease severity and complication status relevant to claim processing.

When to Use

Use a code from this group when documenting a confirmed clinical diagnosis of measles or measles with specific complications identified during the encounter. Assign codes that reflect the presence or absence of complications and the affected organ systems to accurately capture clinical severity.

ICD-10-CM Codes

8 rows

ICD-10-CM Code	Description
B05.0	Measles complicated by encephalitis
B05.1	Measles complicated by meningitis
B05.2	Measles complicated by pneumonia
B05.3	Measles complicated by otitis media
B05.4	Measles with intestinal complications
B05.81	Measles keratitis and keratoconjunctivitis
B05.89	Other measles complications
B05.9	Measles without complication

DRG Codes

16 rows

DRG Code	Description
023	Craniotomy with Major Device Implant or Acute Complex CNS Principal Diagnosis with MCC or Antineoplastic Implant or Epilepsy with Neurostimulator
024	Craniotomy with Major Device Implant or Acute Complex CNS Principal Diagnosis without MCC
097	Non-Bacterial Infection of Nervous System Except Viral Meningitis with MCC
098	Non-Bacterial Infection of Nervous System Except Viral Meningitis with CC
099	Non-Bacterial Infection of Nervous System Except Viral Meningitis without CC/MCC
124	Other Disorders of the Eye with MCC or Thrombolytic Agent
125	Other Disorders of the Eye without MCC
152	Otitis Media and URI with MCC
153	Otitis Media and URI without MCC
177	Respiratory Infections and Inflammations with MCC
178	Respiratory Infections and Inflammations with CC
179	Respiratory Infections and Inflammations without CC/MCC
791	Prematurity with Major Problems
793	Full Term Neonate with Major Problems
865	Viral Illness with MCC
866	Viral Illness without MCC

Typical Clinical Scenarios

An unvaccinated toddler presents to the emergency department with high fever, cough, coryza, conjunctivitis, and a diffuse maculopapular rash that began on the face and spread caudally; Koplik spots are noted on oral exam and illness onset is 4 days prior. This acute viral exanthem with classic prodromal symptoms prompts acute diagnostic evaluation and isolation precautions, and a measles code is assigned for the active infection. Typical codes: B05.0, B05.9
An adolescent with a documented recent exposure to a confirmed measles case develops measles with otitis media and persistent fever requiring outpatient antibiotic therapy; the patient is otherwise immunocompetent and presents to urgent care. Because the primary illness is measles complicated by a secondary bacterial middle ear infection, the visit is coded to capture measles with otitis media to reflect the complication associated with the viral infection. Typical codes: B05.1, B05.89
An adult with a history of measles diagnosed 2 weeks ago is hospitalized for acute encephalitis manifesting as altered mental status and focal neurologic deficits; cerebrospinal fluid and imaging support a postinfectious measles-related neurologic complication. The hospitalization is coded to reflect measles with encephalitis to document the severe neurologic complication and guide infection control and public health reporting. Typical codes: B05.3, B05.81

ICD-10-CM Code For Herpesviral Herpes Simplex Infections: Group Overview

B01-VARICELLA-CHICKENPOX

ICD-10-CM Code For Varicella Chickenpox: Group Overview

B02-ZOSTER-HERPES-ZOSTER

ICD-10-CM Code For Zoster Herpes Zoster: Group Overview

B03-SMALLPOX

ICD-10-CM Code For Smallpox: Group Overview

B04-MONKEYPOX

ICD-10-CM Code For Monkeypox: Group Overview

B06-RUBELLA-GERMAN-MEASLES

ICD-10-CM Code For Rubella German Measles: Group Overview

B07-VIRAL-WARTS

ICD-10-CM Code For Viral Warts: Group Overview

B08-OTHER-VIRAL-SKIN-AND-MUCOUS-LESIONS

ICD-10-CM Code For Other Viral Infections Characterized By Skin And Mucous Membrane Lesions: Group Overview

B09-UNSPECIFIED-VIRAL-MUCOCUTANEOUS-LESIONS

ICD-10-CM Code For Unspecified Viral Infection Characterized By Skin And Mucous Membrane Lesions: Group Overview

Frequently Asked Questions

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.

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When to Use

ICD-10-CM Codes

8 rows

ICD-10-CM Code	Description
B05.0	Measles complicated by encephalitis
B05.1	Measles complicated by meningitis
B05.2	Measles complicated by pneumonia
B05.3	Measles complicated by otitis media
B05.4	Measles with intestinal complications
B05.81	Measles keratitis and keratoconjunctivitis
B05.89	Other measles complications
B05.9	Measles without complication

DRG Codes

16 rows

DRG Code	Description
023	Craniotomy with Major Device Implant or Acute Complex CNS Principal Diagnosis with MCC or Antineoplastic Implant or Epilepsy with Neurostimulator
024	Craniotomy with Major Device Implant or Acute Complex CNS Principal Diagnosis without MCC
097	Non-Bacterial Infection of Nervous System Except Viral Meningitis with MCC
098	Non-Bacterial Infection of Nervous System Except Viral Meningitis with CC
099	Non-Bacterial Infection of Nervous System Except Viral Meningitis without CC/MCC
124	Other Disorders of the Eye with MCC or Thrombolytic Agent
125	Other Disorders of the Eye without MCC
152	Otitis Media and URI with MCC
153	Otitis Media and URI without MCC
177	Respiratory Infections and Inflammations with MCC
178	Respiratory Infections and Inflammations with CC
179	Respiratory Infections and Inflammations without CC/MCC
791	Prematurity with Major Problems
793	Full Term Neonate with Major Problems
865	Viral Illness with MCC
866	Viral Illness without MCC

Typical Clinical Scenarios

An unvaccinated toddler presents to the emergency department with high fever, cough, coryza, conjunctivitis, and a diffuse maculopapular rash that began on the face and spread caudally; Koplik spots are noted on oral exam and illness onset is 4 days prior. This acute viral exanthem with classic prodromal symptoms prompts acute diagnostic evaluation and isolation precautions, and a measles code is assigned for the active infection. Typical codes: B05.0, B05.9
An adolescent with a documented recent exposure to a confirmed measles case develops measles with otitis media and persistent fever requiring outpatient antibiotic therapy; the patient is otherwise immunocompetent and presents to urgent care. Because the primary illness is measles complicated by a secondary bacterial middle ear infection, the visit is coded to capture measles with otitis media to reflect the complication associated with the viral infection. Typical codes: B05.1, B05.89
An adult with a history of measles diagnosed 2 weeks ago is hospitalized for acute encephalitis manifesting as altered mental status and focal neurologic deficits; cerebrospinal fluid and imaging support a postinfectious measles-related neurologic complication. The hospitalization is coded to reflect measles with encephalitis to document the severe neurologic complication and guide infection control and public health reporting. Typical codes: B05.3, B05.81

ICD-10-CM Code For Herpesviral Herpes Simplex Infections: Group Overview

B01-VARICELLA-CHICKENPOX

ICD-10-CM Code For Varicella Chickenpox: Group Overview

B02-ZOSTER-HERPES-ZOSTER

ICD-10-CM Code For Zoster Herpes Zoster: Group Overview

B03-SMALLPOX

ICD-10-CM Code For Smallpox: Group Overview

B04-MONKEYPOX

ICD-10-CM Code For Monkeypox: Group Overview

B06-RUBELLA-GERMAN-MEASLES

ICD-10-CM Code For Rubella German Measles: Group Overview

B07-VIRAL-WARTS

ICD-10-CM Code For Viral Warts: Group Overview

B08-OTHER-VIRAL-SKIN-AND-MUCOUS-LESIONS

ICD-10-CM Code For Other Viral Infections Characterized By Skin And Mucous Membrane Lesions: Group Overview

B09-UNSPECIFIED-VIRAL-MUCOCUTANEOUS-LESIONS

ICD-10-CM Code For Unspecified Viral Infection Characterized By Skin And Mucous Membrane Lesions: Group Overview

Frequently Asked Questions

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.

Published by

Trek Health powers OpenPayer with a leading commercial payer intelligence platform, seamlessly converting fragmented payer data into actionable insights for provider organizations.

ICD-10-CM Code For Measles: Group Overview

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ICD-10-CM B05: Measles Overview

ICD-10-CM Code For Measles: Group Overview

Sign up for ICD-10-CM Code For Measles: Group Overview policy alerts

ICD-10-CM B05: Measles Overview

When to Use

ICD-10-CM Codes

DRG Codes

Typical Clinical Scenarios

Related Codes

References

When to Use

ICD-10-CM Codes

DRG Codes

Typical Clinical Scenarios

Related Codes

References

ICD-10-CM Code For Measles: Group Overview

Sign up for ICD-10-CM Code For Measles: Group Overview policy alerts

ICD-10-CM B05: Measles Overview

ICD-10-CM Code For Measles: Group Overview

Sign up for ICD-10-CM Code For Measles: Group Overview policy alerts

ICD-10-CM B05: Measles Overview

When to Use

ICD-10-CM Codes

DRG Codes

Typical Clinical Scenarios

Related Codes

Which ICD-10-CM codes are included in the B05 measles group?

How does coding within the B05 group affect reimbursement?

Which complications are explicitly specified by `B05` subcodes?

What related DRGs might be assigned for measles with neurologic or respiratory complications?

What clinical features justify using a `B05` code rather than a general viral illness code?

References

When to Use

ICD-10-CM Codes

DRG Codes

Typical Clinical Scenarios

Related Codes

Which ICD-10-CM codes are included in the B05 measles group?

How does coding within the B05 group affect reimbursement?

Which complications are explicitly specified by `B05` subcodes?

What related DRGs might be assigned for measles with neurologic or respiratory complications?

What clinical features justify using a `B05` code rather than a general viral illness code?

References