ICD-10-CM 2027
ICD-10 code for trichomoniasis
From the official ICD-10-CM alphabetic index entry “Trichomoniasis”. Page updated September 29, 2026.
About coding trichomoniasis
The ICD-10-CM code for trichomoniasis is A59.9 (Trichomoniasis, unspecified). The official index lists 10 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on A59.9.
Within A59, choose A59.9 (unspecified) only when documentation doesn't support a more specific option: urogenital trichomoniasis (A59.0) and of other sites (A59.8).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 867 (Other Infectious and Parasitic Diseases Diagnoses with MCC, relative weight 2.1859), DRG 868 (Other Infectious and Parasitic Diseases Diagnoses with CC, relative weight 1.0235) and DRG 869 (Other Infectious and Parasitic Diseases Diagnoses without CC/MCC, relative weight 0.6787), in MDC 18 (Infectious and Parasitic Diseases, Systemic or Unspecified Sites), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
More specific trichomoniasis codes (official index)
- bladder A59.03 — Trichomonal cystitis and urethritis
- cervix A59.09 — Other urogenital trichomoniasis
- intestinal A07.8 — Other specified protozoal intestinal diseases
- prostate A59.02 — Trichomonal prostatitis
- seminal vesicles A59.09 — Other urogenital trichomoniasis
- specified site NEC A59.8 — Trichomoniasis of other sites
- urethra A59.03 — Trichomonal cystitis and urethritis
- urogenitalis A59.00 — Urogenital trichomoniasis, unspecified
- vagina A59.01 — Trichomonal vulvovaginitis
- vulva A59.01 — Trichomonal vulvovaginitis
Common questions about trichomoniasis ICD-10 codes
What is the ICD-10 code for trichomoniasis?
- A59.9 — Trichomoniasis, unspecified. More specific codes apply when the documentation supports them: A59.03, A59.09, A07.8, A59.02 and others below.
What is the ICD-10 code for bladder trichomoniasis?
- A59.03 — Trichomonal cystitis and urethritis.
What is the ICD-10 code for cervix trichomoniasis?
- A59.09 — Other urogenital trichomoniasis.
What is the ICD-10 code for intestinal trichomoniasis?
- A07.8 — Other specified protozoal intestinal diseases.
What is the ICD-10 code for prostate trichomoniasis?
- A59.02 — Trichomonal prostatitis.
What is the ICD-10 code for seminal vesicles trichomoniasis?
- A59.09 — Other urogenital trichomoniasis.
What is the ICD-10 code for urethra trichomoniasis?
- A59.03 — Trichomonal cystitis and urethritis.
Is A59.9 billable?
- Yes. A59.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can A59.9 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict A59.9 as a principal diagnosis.
Is A59.9 a CC or MCC?
- No. A59.9 is neither a CC nor an MCC under MS-DRG v44.0.