A50-A64Not billable, use a more specific code below
Infections with a predominantly sexual mode of transmission (A50-A64)
chapter 1: Certain Infectious and Parasitic Diseases
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Instructional notes
Official coding guidelines
From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.
Rules for coding infections and parasitic diseases, including HIV, organism and drug resistance codes, sepsis and septic shock, MRSA, Zika, and COVID-19.
- Human Immunodeficiency Virus (HIV) Infections (page 19)
- Infectious agents as the cause of diseases classified to other chapters (page 22)
- Infections resistant to antibiotics (page 22)
- Sepsis, Severe Sepsis, and Septic Shock (page 23)
- Methicillin Resistant Staphylococcus aureus (MRSA) Conditions (page 27)
- Zika virus infections (page 28)
- Coronavirus infections (page 28)
All codes under A50-A64
A50-A64 can't be used on a claim. Pick a billable code below; grey headings group them.
- A50Congenital syphilis
- A50.0Early congenital syphilis, symptomatic
- A50.01Early congenital syphilitic oculopathy
- A50.02Early congenital syphilitic osteochondropathy
- A50.03Early congenital syphilitic pharyngitis
- A50.04Early congenital syphilitic pneumonia
- A50.05Early congenital syphilitic rhinitis
- A50.06Early cutaneous congenital syphilis
- A50.07Early mucocutaneous congenital syphilis
- A50.08Early visceral congenital syphilis
- A50.09Other early congenital syphilis, symptomatic
- A50.1Early congenital syphilis, latent
- A50.2Early congenital syphilis, unspecified
- A50.3Late congenital syphilitic oculopathy
- A50.30Late congenital syphilitic oculopathy, unspecified
- A50.31Late congenital syphilitic interstitial keratitis
- A50.32Late congenital syphilitic chorioretinitis
- A50.39Other late congenital syphilitic oculopathy
- A50.4Late congenital neurosyphilis [juvenile neurosyphilis]
- A50.40Late congenital neurosyphilis, unspecified
- A50.41Late congenital syphilitic meningitis
- A50.42Late congenital syphilitic encephalitis
- A50.43Late congenital syphilitic polyneuropathy
- A50.44Late congenital syphilitic optic nerve atrophy
- A50.45Juvenile general paresis
- A50.49Other late congenital neurosyphilis
- A50.5Other late congenital syphilis, symptomatic
- A50.51Clutton's joints
- A50.52Hutchinson's teeth
- A50.53Hutchinson's triad
- A50.54Late congenital cardiovascular syphilis
- A50.55Late congenital syphilitic arthropathy
- A50.56Late congenital syphilitic osteochondropathy
- A50.57Syphilitic saddle nose
- A50.59Other late congenital syphilis, symptomatic
- A50.6Late congenital syphilis, latent
- A50.7Late congenital syphilis, unspecified
- A50.9Congenital syphilis, unspecified
- A51Early syphilis
- A51.0Primary genital syphilis
- A51.1Primary anal syphilis
- A51.2Primary syphilis of other sites
- A51.3Secondary syphilis of skin and mucous membranes
- A51.31Condyloma latum
- A51.32Syphilitic alopecia
- A51.39Other secondary syphilis of skin
- A51.4Other secondary syphilis
- A51.41Secondary syphilitic meningitis
- A51.42Secondary syphilitic female pelvic disease
- A51.43Secondary syphilitic oculopathy
- A51.44Secondary syphilitic nephritis
- A51.45Secondary syphilitic hepatitis
- A51.46Secondary syphilitic osteopathy
- A51.49Other secondary syphilitic conditions
- A51.5Early syphilis, latent
- A51.9Early syphilis, unspecified
- A52Late syphilis
- A52.0Cardiovascular and cerebrovascular syphilis
- A52.00Cardiovascular syphilis, unspecified
- A52.01Syphilitic aneurysm of aorta
- A52.02Syphilitic aortitis
- A52.03Syphilitic endocarditis
- A52.04Syphilitic cerebral arteritis
- A52.05Other cerebrovascular syphilis
- A52.06Other syphilitic heart involvement
- A52.09Other cardiovascular syphilis
- A52.1Symptomatic neurosyphilis
- A52.10Symptomatic neurosyphilis, unspecified
- A52.11Tabes dorsalis
- A52.12Other cerebrospinal syphilis
- A52.13Late syphilitic meningitis
- A52.14Late syphilitic encephalitis
- A52.15Late syphilitic neuropathy
- A52.16Charcot's arthropathy (tabetic)
- A52.17General paresis
- A52.19Other symptomatic neurosyphilis
- A52.2Asymptomatic neurosyphilis
- A52.3Neurosyphilis, unspecified
- A52.7Other symptomatic late syphilis
- A52.71Late syphilitic oculopathy
- A52.72Syphilis of lung and bronchus
- A52.73Symptomatic late syphilis of other respiratory organs
- A52.74Syphilis of liver and other viscera
- A52.75Syphilis of kidney and ureter
- A52.76Other genitourinary symptomatic late syphilis
- A52.77Syphilis of bone and joint
- A52.78Syphilis of other musculoskeletal tissue
- A52.79Other symptomatic late syphilis
- A52.8Late syphilis, latent
- A52.9Late syphilis, unspecified
- A53Other and unspecified syphilis
- A53.0Latent syphilis, unspecified as early or late
- A53.9Syphilis, unspecified
- A54Gonococcal infection
- A54.0Gonococcal infection of lower genitourinary tract without periurethral or accessory gland abscess
- A54.00Gonococcal infection of lower genitourinary tract, unspecified
- A54.01Gonococcal cystitis and urethritis, unspecified
- A54.02Gonococcal vulvovaginitis, unspecified
- A54.03Gonococcal cervicitis, unspecified
- A54.09Other gonococcal infection of lower genitourinary tract
- A54.1Gonococcal infection of lower genitourinary tract with periurethral and accessory gland abscess
- A54.2Gonococcal pelviperitonitis and other gonococcal genitourinary infection
- A54.21Gonococcal infection of kidney and ureter
- A54.22Gonococcal prostatitis
- A54.23Gonococcal infection of other male genital organs
- A54.24Gonococcal female pelvic inflammatory disease
- A54.29Other gonococcal genitourinary infections
- A54.3Gonococcal infection of eye
- A54.30Gonococcal infection of eye, unspecified
- A54.31Gonococcal conjunctivitis
- A54.32Gonococcal iridocyclitis
- A54.33Gonococcal keratitis
- A54.39Other gonococcal eye infection
- A54.4Gonococcal infection of musculoskeletal system
- A54.40Gonococcal infection of musculoskeletal system, unspecified
- A54.41Gonococcal spondylopathy
- A54.42Gonococcal arthritis
- A54.43Gonococcal osteomyelitis
- A54.49Gonococcal infection of other musculoskeletal tissue
- A54.5Gonococcal pharyngitis
- A54.6Gonococcal infection of anus and rectum
- A54.8Other gonococcal infections
- A54.81Gonococcal meningitis
- A54.82Gonococcal brain abscess
- A54.83Gonococcal heart infection
- A54.84Gonococcal pneumonia
- A54.85Gonococcal peritonitis
- A54.86Gonococcal sepsis
- A54.89Other gonococcal infections
- A54.9Gonococcal infection, unspecified
- A55Chlamydial lymphogranuloma (venereum)
- A56Other sexually transmitted chlamydial diseases
- A56.0Chlamydial infection of lower genitourinary tract
- A56.00Chlamydial infection of lower genitourinary tract, unspecified
- A56.01Chlamydial cystitis and urethritis
- A56.02Chlamydial vulvovaginitis
- A56.09Other chlamydial infection of lower genitourinary tract
- A56.1Chlamydial infection of pelviperitoneum and other genitourinary organs
- A56.11Chlamydial female pelvic inflammatory disease
- A56.19Other chlamydial genitourinary infection
- A56.2Chlamydial infection of genitourinary tract, unspecified
- A56.3Chlamydial infection of anus and rectum
- A56.4Chlamydial infection of pharynx
- A56.8Sexually transmitted chlamydial infection of other sites
- A57Chancroid
- A58Granuloma inguinale
- A59Trichomoniasis
- A59.0Urogenital trichomoniasis
- A59.00Urogenital trichomoniasis, unspecified
- A59.01Trichomonal vulvovaginitis
- A59.02Trichomonal prostatitis
- A59.03Trichomonal cystitis and urethritis
- A59.09Other urogenital trichomoniasis
- A59.8Trichomoniasis of other sites
- A59.9Trichomoniasis, unspecified
- A60Anogenital herpesviral [herpes simplex] infections
- A60.0Herpesviral infection of genitalia and urogenital tract
- A60.00Herpesviral infection of urogenital system, unspecified
- A60.01Herpesviral infection of penis
- A60.02Herpesviral infection of other male genital organs
- A60.03Herpesviral cervicitis
- A60.04Herpesviral vulvovaginitis
- A60.09Herpesviral infection of other urogenital tract
- A60.1Herpesviral infection of perianal skin and rectum
- A60.9Anogenital herpesviral infection, unspecified
- A63Other predominantly sexually transmitted diseases, not elsewhere classified
- A63.0Anogenital (venereal) warts
- A63.8Other specified predominantly sexually transmitted diseases
- A64Unspecified sexually transmitted disease
A50-A64 MS-DRGs
This code does not group to an MS-DRG as a principal diagnosis.
Other codes that refer to A50-A64
Notes on these codes point to A50-A64.
- N34 Excludes2: urethritis in diseases with a predominantly sexual mode of transmission (A50-A64)
About the condition
Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.
Syphilis
Syphilis is a sexually transmitted infection (STI) caused by bacteria. It infects the genital area, lips, mouth, or anus of both men and women. You usually get syphilis from sexual contact with someone who has it. It can also pass from mother to baby during pregnancy.
Read more about syphilis on MedlinePlus