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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