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 Codes Billable Only

Internal Codes

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A57|
Chancroid
A58|
Granuloma inguinale
A59|
Trichomoniasis
A59.0|
Urogenital trichomoniasis
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|
Anogenital herpesviral [herpes simplex] infections
A60.0|
Herpesviral infection of genitalia and urogenital tract
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|
Other predominantly sexually transmitted diseases, not elsewhere classified
A63.0|
Anogenital (venereal) warts
A63.8|
Other specified predominantly sexually transmitted diseases
A64|
Unspecified sexually transmitted disease
A65|
Nonvenereal syphilis
A66|
Yaws
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|
Pinta [carate]
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
A68|
Relapsing fevers
A68.0|
Louse-borne relapsing fever
A68.1|
Tick-borne relapsing fever
A68.9|
Relapsing fever, unspecified
A69|
Other spirochetal infections
A69.0|
Necrotizing ulcerative stomatitis
A69.1|
Other Vincent's infections

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