ICD-10 Diagnosis Code A51.0

Primary genital syphilis

Diagnosis Code A51.0

ICD-10: A51.0
Short Description: Primary genital syphilis
Long Description: Primary genital syphilis
This is the 2017 version of the ICD-10-CM diagnosis code A51.0

Code Classification
  • Certain infectious and parasitic diseases
    • Infections with a predominantly sexual mode of transmission (A50-A64)
      • Early syphilis (A51)

Information for Medical Professionals

Diagnostic Related Groups
The diagnosis code A51.0 is grouped in the following Diagnostic Related Group(s) (MS-DRG v33.0)


Convert to ICD-9 Additional informationCallout TooltipGeneral Equivalence Map
The ICD-10 and ICD-9 GEMs are used to facilitate linking between the diagnosis codes in ICD-9-CM and the new ICD-10-CM code set. The GEMs are the raw material from which providers, health information vendors and payers can derive specific applied mappings to meet their needs.
  • 091.0 - Primary genital syphilis

  • Bacterial balanitis
  • Early symptomatic syphilis
  • Infective dermatosis of male genitalia
  • Primary genital syphilis
  • Primary symptomatic early syphilis
  • Primary syphilis
  • Syphilitic balanitis
  • Syphilitic chancre of penis
  • Syphilitic chancre of vulva
  • Ulcer of penis

Index of Diseases and Injuries
References found for the code A51.0 in the Index of Diseases and Injuries:

Information for Patients


Syphilis is a sexually transmitted disease 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.

The early stage of syphilis usually causes a single, small, painless sore. Sometimes it causes swelling in nearby lymph nodes. If you do not treat it, syphilis usually causes a non-itchy skin rash, often on your hands and feet. Many people do not notice symptoms for years. Symptoms can go away and come back.

The sores caused by syphilis make it easier to get or give someone HIV during sex. If you are pregnant, syphilis can cause birth defects, or you could lose your baby. In rare cases, syphilis causes serious health problems and even death.

Syphilis is easy to cure with antibiotics if you catch it early. Correct usage of latex condoms greatly reduces, but does not completely eliminate, the risk of catching or spreading syphilis.

NIH: National Institute of Allergy and Infectious Diseases

  • Condom Fact Sheet in Brief (Centers for Disease Control and Prevention)
  • Congenital syphilis
  • CSF-VDRL test
  • FTA-ABS test
  • Neurosyphilis
  • RPR test
  • Syphilis (Centers for Disease Control and Prevention)
  • Syphilis - primary
  • Syphilis and MSM (Men Who Have Sex with Men) (Centers for Disease Control and Prevention)
  • VDRL test

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