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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