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
PrevNext
  • 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

PreviousPage 9 of 22Next