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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  • A51.32|

    Syphilitic alopecia

  • A51.39|

    Other secondary syphilis of skin

  • A51.4|

    Other secondary syphilis

  • 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|

    Late syphilis

  • A52.0|

    Cardiovascular and cerebrovascular syphilis

  • 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

  • A52.1|

    Symptomatic neurosyphilis

  • A52.10|

    Symptomatic neurosyphilis, unspecified

  • A52.11|

    Tabes dorsalis

  • A52.12|

    Other cerebrospinal syphilis

  • A52.13|

    Late syphilitic meningitis

  • A52.14|

    Late syphilitic encephalitis

  • A52.15|

    Late syphilitic neuropathy

  • A52.16|

    Charcôt's arthropathy (tabetic)

  • A52.17|

    General paresis

  • A52.19|

    Other symptomatic neurosyphilis

  • A52.2|

    Asymptomatic neurosyphilis

  • A52.3|

    Neurosyphilis, unspecified

  • A52.7|

    Other symptomatic late syphilis

  • A52.71|

    Late syphilitic oculopathy

  • A52.72|

    Syphilis of lung and bronchus

  • A52.73|

    Symptomatic late syphilis of other respiratory organs

  • A52.74|

    Syphilis of liver and other viscera

  • A52.75|

    Syphilis of kidney and ureter

  • A52.76|

    Other genitourinary symptomatic late syphilis

  • A52.77|

    Syphilis of bone and joint

  • A52.78|

    Syphilis of other musculoskeletal tissue

  • A52.79|

    Other symptomatic late syphilis

  • A52.8|

    Late syphilis, latent

  • A52.9|

    Late syphilis, unspecified

  • A53|

    Other and unspecified syphilis

  • A53.0|

    Latent syphilis, unspecified as early or late

  • A53.9|

    Syphilis, unspecified

  • A54|

    Gonococcal infection

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