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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  • A54.86|

    Gonococcal sepsis

  • A54.89|

    Other gonococcal infections

  • A54.9|

    Gonococcal infection, unspecified

  • A55|

    Chlamydial lymphogranuloma (venereum)

  • A56.00|

    Chlamydial infection of lower genitourinary tract, unspecified

  • A56.01|

    Chlamydial cystitis and urethritis

  • A56.02|

    Chlamydial vulvovaginitis

  • A56.09|

    Other chlamydial infection of lower genitourinary tract

  • A56.11|

    Chlamydial female pelvic inflammatory disease

  • A56.19|

    Other chlamydial genitourinary infection

  • A56.2|

    Chlamydial infection of genitourinary tract, unspecified

  • A56.3|

    Chlamydial infection of anus and rectum

  • A56.4|

    Chlamydial infection of pharynx

  • A56.8|

    Sexually transmitted chlamydial infection of other sites

  • A57|

    Chancroid

  • A58|

    Granuloma inguinale

  • A59.00|

    Urogenital trichomoniasis, unspecified

  • A59.01|

    Trichomonal vulvovaginitis

  • A59.02|

    Trichomonal prostatitis

  • A59.03|

    Trichomonal cystitis and urethritis

  • A59.09|

    Other urogenital trichomoniasis

  • A59.8|

    Trichomoniasis of other sites

  • A59.9|

    Trichomoniasis, unspecified

  • A60.00|

    Herpesviral infection of urogenital system, unspecified

  • A60.01|

    Herpesviral infection of penis

  • A60.02|

    Herpesviral infection of other male genital organs

  • A60.03|

    Herpesviral cervicitis

  • A60.04|

    Herpesviral vulvovaginitis

  • A60.09|

    Herpesviral infection of other urogenital tract

  • A60.1|

    Herpesviral infection of perianal skin and rectum

  • A60.9|

    Anogenital herpesviral infection, unspecified

  • A63.0|

    Anogenital (venereal) warts

  • A63.8|

    Other specified predominantly sexually transmitted diseases

  • A64|

    Unspecified sexually transmitted disease

  • A65|

    Nonvenereal syphilis

  • A66.0|

    Initial lesions of yaws

  • A66.1|

    Multiple papillomata and wet crab yaws

  • A66.2|

    Other early skin lesions of yaws

  • A66.3|

    Hyperkeratosis of yaws

  • A66.4|

    Gummata and ulcers of yaws

  • A66.5|

    Gangosa

  • A66.6|

    Bone and joint lesions of yaws

  • A66.7|

    Other manifestations of yaws

  • A66.8|

    Latent yaws

  • A66.9|

    Yaws, unspecified

  • A67.0|

    Primary lesions of pinta

  • A67.1|

    Intermediate lesions of pinta

  • A67.2|

    Late lesions of pinta

  • A67.3|

    Mixed lesions of pinta

  • A67.9|

    Pinta, unspecified

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