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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  • A50.09|

    Other early congenital syphilis, symptomatic

  • A50.1|

    Early congenital syphilis, latent

  • A50.2|

    Early congenital syphilis, unspecified

  • A50.30|

    Late congenital syphilitic oculopathy, unspecified

  • A50.31|

    Late congenital syphilitic interstitial keratitis

  • A50.32|

    Late congenital syphilitic chorioretinitis

  • A50.39|

    Other late congenital syphilitic oculopathy

  • A50.40|

    Late congenital neurosyphilis, unspecified

  • A50.41|

    Late congenital syphilitic meningitis

  • A50.42|

    Late congenital syphilitic encephalitis

  • A50.43|

    Late congenital syphilitic polyneuropathy

  • A50.44|

    Late congenital syphilitic optic nerve atrophy

  • A50.45|

    Juvenile general paresis

  • A50.49|

    Other late congenital neurosyphilis

  • A50.51|

    Clutton's joints

  • A50.52|

    Hutchinson's teeth

  • A50.53|

    Hutchinson's triad

  • A50.54|

    Late congenital cardiovascular syphilis

  • A50.55|

    Late congenital syphilitic arthropathy

  • A50.56|

    Late congenital syphilitic osteochondropathy

  • A50.57|

    Syphilitic saddle nose

  • A50.59|

    Other late congenital syphilis, symptomatic

  • A50.6|

    Late congenital syphilis, latent

  • A50.7|

    Late congenital syphilis, unspecified

  • A50.9|

    Congenital syphilis, unspecified

  • A51.0|

    Primary genital syphilis

  • A51.1|

    Primary anal syphilis

  • A51.2|

    Primary syphilis of other sites

  • A51.31|

    Condyloma latum

  • A51.32|

    Syphilitic alopecia

  • A51.39|

    Other secondary syphilis of skin

  • A51.41|

    Secondary syphilitic meningitis

  • A51.42|

    Secondary syphilitic female pelvic disease

  • A51.43|

    Secondary syphilitic oculopathy

  • A51.44|

    Secondary syphilitic nephritis

  • A51.45|

    Secondary syphilitic hepatitis

  • A51.46|

    Secondary syphilitic osteopathy

  • A51.49|

    Other secondary syphilitic conditions

  • A51.5|

    Early syphilis, latent

  • A51.9|

    Early syphilis, unspecified

  • A52.00|

    Cardiovascular syphilis, unspecified

  • A52.01|

    Syphilitic aneurysm of aorta

  • A52.02|

    Syphilitic aortitis

  • A52.03|

    Syphilitic endocarditis

  • A52.04|

    Syphilitic cerebral arteritis

  • A52.05|

    Other cerebrovascular syphilis

  • A52.06|

    Other syphilitic heart involvement

  • A52.09|

    Other cardiovascular syphilis

  • A52.10|

    Symptomatic neurosyphilis, unspecified

  • A52.11|

    Tabes dorsalis

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