2022 ICD-10-CM Diagnosis Code B04: Monkeypox

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2026

  1. ICD-10-CM Codes
    2. ›
  2. A00-B99
    3. ›
  3. B00-B09
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  4. B04-
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  5. 2026 ICD-10-CM Diagnosis Code B04
2026 ICD-10-CM Diagnosis Code B04

Monkeypox

    2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 Billable/Specific Code
  • B04 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • The 2026 edition of ICD-10-CM B04 became effective on October 1, 2025.
  • This is the American ICD-10-CM version of B04 - other international versions of ICD-10 B04 may differ.
Applicable To
  • Mpox
The following code(s) above B04 contain annotation back-referencesAnnotation Back-ReferencesIn this context, annotation back-references refer to codes that contain:
  • Applicable To annotations, or
  • Code Also annotations, or
  • Code First annotations, or
  • Excludes1 annotations, or
  • Excludes2 annotations, or
  • Includes annotations, or
  • Note annotations, or
  • Use Additional annotations
that may be applicable to B04:
  • A00-B99 2026 ICD-10-CM Range A00-B99

    Certain infectious and parasitic diseasesIncludes
    • diseases generally recognized as communicable or transmissible
    Type 1 Excludes
    • certain localized infections - see body system-related chapters
    Type 2 Excludes
    • carrier or suspected carrier of infectious disease (Z22.-)
    • 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)
    Use Additional
    • code to identify resistance to antimicrobial drugs (Z16.-)
    Certain infectious and parasitic diseases

Approximate Synonyms
  • Human monkeypox
  • Monkeypox infection
Clinical Information
  • A viral disease infecting primates and rodents. Its clinical presentation in humans is similar to smallpox including fever; headache; cough; and a painful rash. It is caused by monkeypox virus and is usually transmitted to humans through bites or via contact with an animal's blood. Interhuman transmission is relatively low (significantly less than smallpox).
ICD-10-CM B04 is grouped within Diagnostic Related Group(s) (MS-DRG v43.0):
  • 865 Viral illness with mcc
  • 866 Viral illness without mcc

Convert B04 to ICD-9-CM

Code History
  • 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
  • 2017 (effective 10/1/2016): No change
  • 2018 (effective 10/1/2017): No change
  • 2019 (effective 10/1/2018): No change
  • 2020 (effective 10/1/2019): No change
  • 2021 (effective 10/1/2020): No change
  • 2022 (effective 10/1/2021): No change
  • 2023 (effective 10/1/2022): No change
  • 2024 (effective 10/1/2023): No change
  • 2025 (effective 10/1/2024): No change
  • 2026 (effective 10/1/2025): No change
Code annotations containing back-references to B04:
  • Type 2 Excludes: B08.0 ICD-10-CM Diagnosis Code B08.0

    Other orthopoxvirus infections

      2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 Non-Billable/Non-Specific Code
    Type 2 Excludes
    • monkeypox (B04)

Diagnosis Index entries containing back-references to B04:

  • Monkeypox B04
  • Mpox B04

ICD-10-CM Codes Adjacent To B04 B02.30 …… unspecified B02.31 Zoster conjunctivitis B02.32 Zoster iridocyclitis B02.33 Zoster keratitis B02.34 Zoster scleritis B02.39 Other herpes zoster eye disease B02.7 Disseminated zoster B02.8 Zoster with other complications B02.9 Zoster without complications B03 Smallpox B04 Monkeypox B05 Measles 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 B05.8 Measles with other complications B05.81 Measles keratitis and keratoconjunctivitis B05.89 Other measles complications B05.9 Measles without complication

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.

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