| A50 | Congenital syphilis |
| A50.0 | Early congenital syphilis, symptomatic |
| A50.01 | Early congenital syphilitic oculopathy |
| A50.02 | Early congenital syphilitic osteochondropathy |
| A50.03 | Early congenital syphilitic pharyngitis |
| A50.04 | Early congenital syphilitic pneumonia |
| A50.05 | Early congenital syphilitic rhinitis |
| A50.06 | Early cutaneous congenital syphilis |
| A50.07 | Early mucocutaneous congenital syphilis |
| A50.08 | Early visceral congenital syphilis |
| A50.09 | Other early congenital syphilis, symptomatic |
| A50.1 | Early congenital syphilis, latent |
| A50.2 | Early congenital syphilis, unspecified |
| A50.3 | Late congenital syphilitic oculopathy |
| A50.30 | Late congenital syphilitic oculopathy, unspecified |
| A50.31 | Late congenital syphilitic interstitial keratitis |
| A50.32 | Late congenital syphilitic chorioretinitis |
| A50.39 | Other late congenital syphilitic oculopathy |
| A50.4 | Late congenital neurosyphilis [juvenile neurosyphilis] |
| A50.40 | Late congenital neurosyphilis, unspecified |
| A50.41 | Late congenital syphilitic meningitis |
| A50.42 | Late congenital syphilitic encephalitis |
| A50.43 | Late congenital syphilitic polyneuropathy |
| A50.44 | Late congenital syphilitic optic nerve atrophy |
| A50.45 | Juvenile general paresis |
| A50.49 | Other late congenital neurosyphilis |
| A50.5 | Other late congenital syphilis, symptomatic |
| A50.51 | Clutton's joints |
| A50.52 | Hutchinson's teeth |
| A50.53 | Hutchinson's triad |
| A50.54 | Late congenital cardiovascular syphilis |
| A50.55 | Late congenital syphilitic arthropathy |
| A50.56 | Late congenital syphilitic osteochondropathy |
| A50.57 | Syphilitic saddle nose |
| A50.59 | Other late congenital syphilis, symptomatic |
| A50.6 | Late congenital syphilis, latent |
| A50.7 | Late congenital syphilis, unspecified |
| A50.9 | Congenital syphilis, unspecified |
| A51 | Early syphilis |
| A51.0 | Primary genital syphilis |
| A51.1 | Primary anal syphilis |
| A51.2 | Primary syphilis of other sites |
| A51.3 | Secondary syphilis of skin and mucous membranes |
| A51.31 | Condyloma latum |
| A51.32 | Syphilitic alopecia |
| A51.39 | Other secondary syphilis of skin |
| A51.4 | Other secondary syphilis |
| A51.41 | Secondary syphilitic meningitis |
| A51.42 | Secondary syphilitic female pelvic disease |
| A51.43 | Secondary syphilitic oculopathy |
| A51.44 | Secondary syphilitic nephritis |
| A51.45 | Secondary syphilitic hepatitis |
| A51.46 | Secondary syphilitic osteopathy |
| A51.49 | Other secondary syphilitic conditions |
| A51.5 | Early syphilis, latent |
| A51.9 | Early syphilis, unspecified |
| A52 | Late syphilis |
| A52.0 | Cardiovascular and cerebrovascular syphilis |
| A52.00 | Cardiovascular syphilis, unspecified |
| A52.01 | Syphilitic aneurysm of aorta |
| A52.02 | Syphilitic aortitis |
| A52.03 | Syphilitic endocarditis |
| A52.04 | Syphilitic cerebral arteritis |
| A52.05 | Other cerebrovascular syphilis |
| A52.06 | Other syphilitic heart involvement |
| A52.09 | Other cardiovascular syphilis |
| A52.1 | Symptomatic neurosyphilis |
| A52.10 | Symptomatic neurosyphilis, unspecified |
| A52.11 | Tabes dorsalis |
| 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 |
| A52.7 | Other symptomatic late syphilis |
| 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 | Other and unspecified syphilis |
| A53.0 | Latent syphilis, unspecified as early or late |
| A53.9 | Syphilis, unspecified |
| A54 | Gonococcal infection |
| A54.0 | Gonococcal infection of lower genitourinary tract without periurethral or accessory gland abscess |
| 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 |
| A54.2 | Gonococcal pelviperitonitis and other gonococcal genitourinary infection |
| 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 |
| A54.3 | Gonococcal infection of eye |
| 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 |
| A54.4 | Gonococcal infection of musculoskeletal system |
| 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 |
| A54.8 | Other gonococcal infections |
| A54.81 | Gonococcal meningitis |
| A54.82 | Gonococcal brain abscess |
| A54.83 | Gonococcal heart infection |
| A54.84 | Gonococcal pneumonia |
| A54.85 | Gonococcal peritonitis |
| A54.86 | Gonococcal sepsis |
| A54.89 | Other gonococcal infections |
| A54.9 | Gonococcal infection, unspecified |
| A55 | Chlamydial lymphogranuloma (venereum) |
| A56 | Other sexually transmitted chlamydial diseases |
| A56.0 | Chlamydial infection of lower genitourinary tract |
| 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 |
| A56.1 | Chlamydial infection of pelviperitoneum and other genitourinary organs |
| 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 | 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 |