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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  • 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

  • A52.71—

    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

  • A53.0—

    Latent syphilis, unspecified as early or late

  • A53.9—

    Syphilis, unspecified

  • A54.00—

    Gonococcal infection of lower genitourinary tract, unspecified

  • A54.01—

    Gonococcal cystitis and urethritis, unspecified

  • A54.02—

    Gonococcal vulvovaginitis, unspecified

  • A54.03—

    Gonococcal cervicitis, unspecified

  • A54.09—

    Other gonococcal infection of lower genitourinary tract

  • A54.1—

    Gonococcal infection of lower genitourinary tract with periurethral and accessory gland abscess

  • A54.21—

    Gonococcal infection of kidney and ureter

  • A54.22—

    Gonococcal prostatitis

  • A54.23—

    Gonococcal infection of other male genital organs

  • A54.24—

    Gonococcal female pelvic inflammatory disease

  • A54.29—

    Other gonococcal genitourinary infections

  • A54.30—

    Gonococcal infection of eye, unspecified

  • A54.31—

    Gonococcal conjunctivitis

  • A54.32—

    Gonococcal iridocyclitis

  • A54.33—

    Gonococcal keratitis

  • A54.39—

    Other gonococcal eye infection

  • A54.40—

    Gonococcal infection of musculoskeletal system, unspecified

  • A54.41—

    Gonococcal spondylopathy

  • A54.42—

    Gonococcal arthritis

  • A54.43—

    Gonococcal osteomyelitis

  • A54.49—

    Gonococcal infection of other musculoskeletal tissue

  • A54.5—

    Gonococcal pharyngitis

  • A54.6—

    Gonococcal infection of anus and rectum

  • A54.81—

    Gonococcal meningitis

  • A54.82—

    Gonococcal brain abscess

  • A54.83—

    Gonococcal heart infection

  • A54.84—

    Gonococcal pneumonia

  • A54.85—

    Gonococcal peritonitis

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