ICD-10 Diagnosis Code A51.1

Primary anal syphilis

Diagnosis Code A51.1

ICD-10: A51.1
Short Description: Primary anal syphilis
Long Description: Primary anal syphilis
This is the 2017 version of the ICD-10-CM diagnosis code A51.1

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 A51.1 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.
  • 091.1 - Primary anal syphilis

  • Primary anal syphilis
  • Primary extragenital syphilis

Information for Patients

Anal Disorders

Also called: Anorectal diseases

The anus is the opening of the rectum through which stool passes out of your body. Problems with the anus are common. They include hemorrhoids, abscesses, fissures (cracks), and cancer.

You may be embarrassed to talk about your anal troubles. But it is important to let your doctor know, especially if you have pain or bleeding. The more details you can give about your problem, the better your doctor will be able to help you. Treatments vary depending on the particular problem.

NIH: National Institute of Diabetes and Digestive and Kidney Diseases

  • Anal fissure
  • Anal itching -- self-care
  • Anorectal abscess
  • Anoscopy
  • Digital rectal exam
  • Imperforate anus
  • Lower GI Series - NIH (National Institute of Diabetes and Digestive and Kidney Diseases)
  • Perianal streptococcal cellulitis

[Read More]


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

[Read More]
Previous Code
Previous Code A51.0
Next Code
A51.2 Next Code