A59 – Trichomoniasis
ICD-10-CM 2027 diagnosis code · Infections with a predominantly sexual mode of transmission
ICD-10-CM code
A59
- Code
A59(claims format:A59)- Description
- Trichomoniasis
- Billable
- No – use a more specific code below
- Valid for
- Dates of service October 1, 2026 – September 30, 2027 (FY2027)
- Chapter
- 1. Certain infectious and parasitic diseases (A00-B99)
- Block
- A50-A64 Infections with a predominantly sexual mode of transmission
Billable codes under A59
A59 is a header code and cannot be used on claims. Choose the most specific code:
- A59.0 – Urogenital trichomoniasisHeader (more codes below)
- A59.8 – Trichomoniasis of other sitesBillable
- A59.9 – Trichomoniasis, unspecifiedBillable
Notes for A59
Excludes2 (not included here):
- intestinal trichomoniasis (A07.8)
Notes inherited from parent codes
Instructional notes at a category or block level apply to every code below it.
Block A50-A64
Excludes1 (not coded here):
Excludes2 (not included here):
- human immunodeficiency virus [HIV] disease (B20)
Frequently asked questions
What is ICD-10 code A59?
A59 is the ICD-10-CM code for trichomoniasis, in the block A50-A64 (Infections with a predominantly sexual mode of transmission).
Is A59 a billable code?
No. A59 is a header code with more specific child codes; report one of the billable codes listed above.
Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.