A59 Trichomoniasis

Name of the Condition

• Trichomoniasis (ICD-10 code: A59)

Summary

Trichomoniasis is a sexually transmitted infection (STI) caused by the protozoan parasite Trichomonas vaginalis. It can affect the urogenital tract in both men and women, though symptoms are more commonly reported in women. The infection may be asymptomatic but can cause genital discomfort, discharge, or irritation.

Causes

Trichomoniasis is caused by the single-celled parasite Trichomonas vaginalis. Transmission occurs primarily through sexual contact, including vaginal intercourse. The parasite can survive on moist surfaces but is most commonly spread through direct person-to-person contact.

Risk Factors

• Having multiple sexual partners
• A history of other sexually transmitted infections
• Lack of consistent barrier protection during sexual activity
• Not using condoms or other preventive measures

Symptoms

• Women: Vaginal discharge (often yellowish-green, frothy, or malodorous); genital itching, redness, or irritation; discomfort during urination or intercourse.
• Men: Frequently asymptomatic; may experience mild penile discharge, itching, or burning after urination or ejaculation.

Diagnosis

Diagnosis involves clinical evaluation of symptoms, followed by laboratory testing. Common methods include microscopic examination of vaginal or urethral discharge, nucleic acid amplification tests (NAATs), or culture for Trichomonas vaginalis. Testing may be recommended for individuals with symptoms or those at high risk.

Treatment Options

• Oral antibiotics, typically metronidazole or tinidazole, are the standard treatment.
• Both sexual partners should be treated simultaneously to prevent reinfection.
• Abstinence from sexual activity until treatment is completed and symptoms resolve.

Prognosis and Follow-Up

With appropriate treatment, trichomoniasis generally resolves within a week. Follow-up testing is not routinely required unless symptoms persist or reinfection is suspected. Untreated infections may increase the risk of other STIs or complications during pregnancy.

Complications

• Increased susceptibility to HIV infection
• Pelvic inflammatory disease (PID) in women
• Preterm birth or low birth weight in pregnant individuals
• Urethritis or prostatitis in men

Lifestyle & Prevention

• Consistent use of barrier protection (e.g., condoms) during sexual activity.
• Limiting the number of sexual partners.
• Regular STI screening, especially for those with new or multiple partners.
• Avoiding sharing personal items that may come into contact with genital areas.

When to Seek Professional Help

Seek medical care if you experience unusual genital discharge, itching, pain, or discomfort. Prompt evaluation is recommended for individuals with new sexual partners, symptoms of an STI, or concerns about exposure.

Tips for Medical Coders

• Use code A59 for trichomoniasis without further specification.
• Document the presence of symptoms, testing results, or treatment to support code assignment.
• Ensure differentiation from other STIs or vaginal infections when coding.