All ICD10 Codes
Chapter 1

A00–B99: Certain Infectious and Parasitic Diseases

Certain Infectious and Parasitic Diseases diagnostic classification updated for 2026.

Chapter Instructions

Includes
  • diseases generally recognized as communicable or transmissible
Excludes1(Not coded here. Use a different code.)
  • certain localized infections - see body system-related chapters
Excludes2(Not included here. Code separately if applicable.)
  • 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
  • code to identify resistance to antimicrobial drugs (Z16.-)
All CodesBillable Only
Internal Codes
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  • B26.81—

    Mumps hepatitis

  • B26.82—

    Mumps myocarditis

  • B26.83—

    Mumps nephritis

  • B26.84—

    Mumps polyneuropathy

  • B26.85—

    Mumps arthritis

  • B26.89—

    Other mumps complications

  • B26.9—

    Mumps without complication

  • B27—

    Infectious mononucleosis

  • B27.0—

    Gammaherpesviral mononucleosis

  • B27.00—

    Gammaherpesviral mononucleosis without complication

  • B27.01—

    Gammaherpesviral mononucleosis with polyneuropathy

  • B27.02—

    Gammaherpesviral mononucleosis with meningitis

  • B27.09—

    Gammaherpesviral mononucleosis with other complications

  • B27.1—

    Cytomegaloviral mononucleosis

  • B27.10—

    Cytomegaloviral mononucleosis without complications

  • B27.11—

    Cytomegaloviral mononucleosis with polyneuropathy

  • B27.12—

    Cytomegaloviral mononucleosis with meningitis

  • B27.19—

    Cytomegaloviral mononucleosis with other complication

  • B27.8—

    Other infectious mononucleosis

  • B27.80—

    Other infectious mononucleosis without complication

  • B27.81—

    Other infectious mononucleosis with polyneuropathy

  • B27.82—

    Other infectious mononucleosis with meningitis

  • B27.89—

    Other infectious mononucleosis with other complication

  • B27.9—

    Infectious mononucleosis, unspecified

  • B27.90—

    Infectious mononucleosis, unspecified without complication

  • B27.91—

    Infectious mononucleosis, unspecified with polyneuropathy

  • B27.92—

    Infectious mononucleosis, unspecified with meningitis

  • B27.99—

    Infectious mononucleosis, unspecified with other complication

  • B30—

    Viral conjunctivitis

  • B30.0—

    Keratoconjunctivitis due to adenovirus

  • B30.1—

    Conjunctivitis due to adenovirus

  • B30.2—

    Viral pharyngoconjunctivitis

  • B30.3—

    Acute epidemic hemorrhagic conjunctivitis (enteroviral)

  • B30.8—

    Other viral conjunctivitis

  • B30.9—

    Viral conjunctivitis, unspecified

  • B33—

    Other viral diseases, not elsewhere classified

  • B33.0—

    Epidemic myalgia

  • B33.1—

    Ross River disease

  • B33.2—

    Viral carditis

  • B33.20—

    Viral carditis, unspecified

  • B33.21—

    Viral endocarditis

  • B33.22—

    Viral myocarditis

  • B33.23—

    Viral pericarditis

  • B33.24—

    Viral cardiomyopathy

  • B33.3—

    Retrovirus infections, not elsewhere classified

  • B33.4—

    Hantavirus (cardio)-pulmonary syndrome [HPS] [HCPS]

  • B33.8—

    Other specified viral diseases

  • B34—

    Viral infection of unspecified site

  • B34.0—

    Adenovirus infection, unspecified

  • B34.1—

    Enterovirus infection, unspecified

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