Chapter I
Certain infectious and parasitic diseases
(A00-B99)

Infections with a predominantly sexual mode of transmission
(A50-A64)

Excludes: human immunodeficiency virus [HIV] disease ( B20-B24 )
nonspecific and nongonococcal urethritis ( N34.1 )
Reiter's disease ( M02.3 )

A50 Congenital syphilis
A50.0 Early congenital syphilis, symptomatic
Any congenital syphilitic condition specified as early or manifest less than two years after birth.
Early congenital syphilis:
· cutaneous
· mucocutaneous
· visceral
Early congenital syphilitic:
· laryngitis
· oculopathy
· osteochondropathy
· pharyngitis
· pneumonia
· rhinitis
A50.1 Early congenital syphilis, latent
Congenital syphilis without clinical manifestations, with positive serological reaction and negative spinal fluid test, less than two years after birth.
A50.2 Early congenital syphilis, unspecified
Congenital syphilis NOS less than two years after birth.
A50.3 Late congenital syphilitic oculopathy
Late congenital syphilitic interstitial keratitis+ ( H19.2* )
Late congenital syphilitic oculopathy NEC+ ( H58.8* )
Excludes: Hutchinson's triad ( A50.5 )
A50.4 Late congenital neurosyphilis [juvenile neurosyphilis]
Dementia paralytica juvenilis
Juvenile:
· general paresis
· tabes dorsalis
· taboparetic neurosyphilis
Late congenital syphilitic:
· encephalitis+ ( G05.0* )
· meningitis+ ( G01* )
· polyneuropathy+ ( G63.0* )
Use additional code, if desired, to identify any associated mental disorder.
Excludes: Hutchinson's triad ( A50.5 )
A50.5 Other late congenital syphilis, symptomatic
Any congenital syphilitic condition specified as late or manifest two years or more after birth.
Clutton's joints+ ( M03.1* )
Hutchinson's:
· teeth
· triad
Late congenital:
· cardiovascular syphilis+ ( I98.0* )
· syphilitic:
  · arthropathy+ ( M03.1* )
  · osteochondropathy+ ( M90.2* )
Syphilitic saddle nose
A50.6 Late congenital syphilis, latent
Congenital syphilis without clinical manifestations, with positive serological reaction and negative spinal fluid test, two years or more after birth.
A50.7 Late congenital syphilis, unspecified
Congenital syphilis NOS two years or more after birth.
A50.9 Congenital syphilis, unspecified

A51 Early syphilis
A51.0 Primary genital syphilis
Syphilitic chancre NOS
A51.1 Primary anal syphilis
A51.2 Primary syphilis of other sites
A51.3 Secondary syphilis of skin and mucous membranes
Condyloma latum
Syphilitic:
· alopecia+ ( L99.8* )
· leukoderma+ ( L99.8* )
· mucous patch
A51.4 Other secondary syphilis
Secondary syphilitic:
· female pelvic inflammatory disease+ ( N74.2* )
· iridocyclitis+ ( H22.0* )
· lymphadenopathy
· meningitis+ ( G01* )
· myositis+ ( M63.0* )
· oculopathy NEC+ ( H58.8* )
· periostitis+ ( M90.1* )
A51.5 Early syphilis, latent
Syphilis (acquired) without clinical manifestations, with positive serological reaction and negative spinal fluid test, less than two years after infection.
A51.9 Early syphilis, unspecified

A52 Late syphilis
A52.0+ Cardiovascular syphilis
Cardiovascular syphilis NOS ( I98.0* )
Syphilitic:
· aneurysm of aorta ( I79.0* )
· aortic incompetence ( I39.1* )
· aortitis ( I79.1* )
· arteritis, cerebral ( I68.1* )
· endocarditis NOS ( I39.8* )
· myocarditis ( I41.0* )
· pericarditis ( I32.0* )
· pulmonary regurgitation ( I39.3* )
A52.1 Symptomatic neurosyphilis
Charcot's arthropathy+ ( M14.6* )
Late syphilitic:
· acoustic neuritis+ ( H94.0* )
· encephalitis+ ( G05.0* )
· meningitis+ ( G01* )
· optic atrophy+ ( H48.0* )
· polyneuropathy+ ( G63.0* )
· retrobulbar neuritis+ ( H48.1* )
Syphilitic parkinsonism+ ( G22* )
Tabes dorsalis
A52.2 Asymptomatic neurosyphilis
A52.3 Neurosyphilis, unspecified
Gumma (syphilitic)
Syphilis (late)
Syphiloma
}
}
}
of central nervous system NOS
A52.7 Other symptomatic late syphilis
Glomerular disease in syphilis+ ( N08.0* )
Gumma (syphilitic)
Late or tertiary syphilis
}
}
any sites, except those classified to A52.0-A52.3
Late syphilitic:
· bursitis+ ( M73.1* )
· chorioretinitis+ ( H32.0* )
· episcleritis+ ( H19.0* )
· female pelvic inflammatory disease+ ( N74.2* )
· leukoderma+ ( L99.8* )
· oculopathy NEC+ ( H58.8* )
· peritonitis+ ( K67.2* )
Syphilis [stage unspecified] of:
· bone+ ( M90.2* )
· liver+ ( K77.0* )
· lung+ ( J99.8* )
· muscle+ ( M63.0* )
· synovium+ ( M68.0* )
A52.8 Late syphilis, latent
Syphilis (acquired) without clinical manifestations, with positive serological reaction and negative spinal fluid test, two years or more after infection.
A52.9 Late syphilis, unspecified

A53 Other and unspecified syphilis
A53.0 Latent syphilis, unspecified as early or late
Latent syphilis NOS
Positive serological reaction for syphilis
A53.9 Syphilis, unspecified
Infection due to Treponema pallidum NOS
Syphilis (acquired) NOS
Excludes: syphilis NOS causing death under two years of age ( A50.2 )

A54 Gonococcal infection
A54.0 Gonococcal infection of lower genitourinary tract without periurethral or accessory gland abscess
Gonococcal:
· cervicitis NOS
· cystitis NOS
· urethritis NOS
· vulvovaginitis NOS
Excludes: with:
· genitourinary gland abscess ( A54.1 )
· periurethral abscess ( A54.1 )
A54.1 Gonococcal infection of lower genitourinary tract with periurethral and accessory gland abscess
Gonococcal Bartholin's gland abscess
A54.2 Gonococcal pelviperitonitis and other gonococcal genitourinary infections
Gonococcal:
· epididymitis+ ( N51.1* )
· female pelvic inflammatory disease+ ( N74.3* )
· orchitis+ ( N51.1* )
· prostatitis+ ( N51.0* )
Excludes: gonococcal peritonitis ( A54.8 )
A54.3 Gonococcal infection of eye
Gonococcal:
· conjunctivitis+ ( H13.1* )
· iridocyclitis+ ( H22.0* )
Ophthalmia neonatorum due to gonococcus
A54.4+ Gonococcal infection of musculoskeletal system
Gonococcal:
· arthritis ( M01.3* )
· bursitis ( M73.0* )
· osteomyelitis ( M90.2* )
· synovitis ( M68.0* )
· tenosynovitis ( M68.0* )
A54.5 Gonococcal pharyngitis
A54.6 Gonococcal infection of anus and rectum
A54.8 Other gonococcal infections
Gonococcal:
· brain abscess+ ( G07* )
· endocarditis+ ( I39.8* )
· meningitis+ ( G01* )
· myocarditis+ ( I41.0* )
· pericarditis+ ( I32.0* )
· peritonitis+ ( K67.1* )
· pneumonia+ ( J17.0* )
· septicaemia
· skin lesions
Excludes: gonococcal pelviperitonitis ( A54.2 )
A54.9 Gonococcal infection, unspecified

A55 Chlamydial lymphogranuloma (venereum)
Climatic or tropical bubo
Durand-Nicolas-Favre disease
Esthiomene
Lymphogranuloma inguinale

A56 Other sexually transmitted chlamydial diseases
Includes: sexually transmitted diseases due to Chlamydia trachomatis
Excludes: chlamydial:
· lymphogranuloma ( A55 )
· neonatal:
  · conjunctivitis ( P39.1 )
  · pneumonia ( P23.1 )
conditions classified to A74.-
A56.0 Chlamydial infection of lower genitourinary tract
Chlamydial:
· cervicitis
· cystitis
· urethritis
· vulvovaginitis
A56.1 Chlamydial infection of pelviperitoneum and other genitourinary organs
Chlamydial:
· epididymitis+ ( N51.1* )
· female pelvic inflammatory disease+ ( N74.4* )
· orchitis+ ( N51.1* )
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
Ulcus molle

A58 Granuloma inguinale
Donovanosis

A59 Trichomoniasis
Excludes: intestinal trichomoniasis ( A07.8 )
A59.0 Urogenital trichomoniasis
Leukorrhoea (vaginalis)
Prostatitis+ ( N51.0* )
}
}
due to Trichomonas (vaginalis)
A59.8 Trichomoniasis of other sites
A59.9 Trichomoniasis, unspecified

A60 Anogenital herpesviral [herpes simplex] infection
A60.0 Herpesviral infection of genitalia and urogenital tract
Herpesviral infection of genital tract:
· female+ ( N77.0-N77.1* )
· male+ ( N51.-* )
A60.1 Herpesviral infection of perianal skin and rectum
A60.9 Anogenital herpesviral infection, unspecified

A63 Other predominantly sexually transmitted diseases, not elsewhere classified
Excludes: molluscum contagiosum ( B08.1 )
papilloma of cervix ( D26.0 )
A63.0 Anogenital (venereal) warts
A63.8 Other specified predominantly sexually transmitted diseases

A64 Unspecified sexually transmitted disease
Venereal disease NOS