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ICD-10 Guide
ICD-10 CodesA59

A59

Trichomoniasis

BILLABLE STATUSYes
IMPLEMENTATION DATEOctober 1, 2015
LAST UPDATED09/05/2025

Code Description

ICD-10 A59 is a billable code used to indicate a diagnosis of trichomoniasis.

Key Diagnostic Point:

Trichomoniasis is a sexually transmitted infection (STI) caused by the protozoan parasite Trichomonas vaginalis. It primarily affects the urogenital tract in both men and women, although women are more likely to experience symptoms. In women, symptoms may include vaginal discharge, itching, and discomfort during intercourse or urination. Men may experience urethritis, which can manifest as discharge and burning during urination. The infection is often asymptomatic, particularly in men, which can lead to unrecognized transmission. Diagnosis is typically made through laboratory testing of vaginal secretions or urine. Treatment involves the use of antibiotics, most commonly metronidazole or tinidazole, which are effective in eradicating the infection. It is crucial to treat sexual partners simultaneously to prevent reinfection. Contact tracing is an essential component of managing trichomoniasis, as it helps to identify and treat individuals who may have been exposed to the infection, thereby reducing transmission rates. Regular screening for STIs, including trichomoniasis, is recommended for sexually active individuals, particularly those with multiple partners or those who engage in unprotected sex.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Differentiating between symptomatic and asymptomatic cases
  • Need for accurate documentation of sexual history
  • Potential for co-infection with other STIs
  • Variability in presentation among different populations

Audit Risk Factors

  • Inadequate documentation of symptoms
  • Failure to document partner treatment
  • Misclassification of the infection as another STI
  • Lack of follow-up documentation

Specialty Focus

Medical Specialties

Infectious Disease

Documentation Requirements

Detailed patient history, including sexual history and symptomatology.

Common Clinical Scenarios

Diagnosis and management of STIs, including trichomoniasis.

Billing Considerations

Ensure documentation reflects the need for partner treatment and follow-up.

Obstetrics/Gynecology

Documentation Requirements

Documentation of gynecological exams, lab results, and treatment plans.

Common Clinical Scenarios

Routine STI screening in pregnant women or symptomatic patients.

Billing Considerations

Consideration of pregnancy-related implications and treatment safety.

Coding Guidelines

Inclusion Criteria

Use A59 When
  • According to ICD
  • 10 coding guidelines, A59 should be used for confirmed cases of trichomoniasis
  • It is important to document the presence of symptoms and any relevant sexual history

Exclusion Criteria

Do NOT use A59 When
  • Exclusion criteria include other identified STIs that may present similarly

Related Codes

Child Codes

8 codes
A59.0
Trachoma due to Chlamydia trachomatis
A59.00
Urogenital trichomoniasis, unspecified
A59.01
Trichomonal vulvovaginitis
A59.02
Trichomonal prostatitis
A59.03
Trichomonal cystitis and urethritis
A59.09
Other urogenital trichomoniasis
A59.8
Other specified trichomoniasis
A59.9
Trichomoniasis, unspecified

Related CPT Codes

87110CPT Code

Trichomonas vaginalis culture

Clinical Scenario

Used when laboratory confirmation of trichomoniasis is needed.

Documentation Requirements

Document the reason for testing and patient symptoms.

Specialty Considerations

Infectious disease specialists may order this test more frequently.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of trichomoniasis, improving the ability to track and manage STIs. The increased specificity helps in public health reporting and treatment protocols.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of trichomoniasis, improving the ability to track and manage STIs. The increased specificity helps in public health reporting and treatment protocols.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more specific coding of trichomoniasis, improving the ability to track and manage STIs. The increased specificity helps in public health reporting and treatment protocols.

Resources

Clinical References

  • •
    CDC Trichomoniasis Fact Sheet

Coding & Billing References

  • •
    CDC Trichomoniasis Fact Sheet

Frequently Asked Questions

What is the primary treatment for trichomoniasis?

The primary treatment for trichomoniasis is metronidazole or tinidazole, which are both effective in eradicating the infection.