A59.09 ICD-10-CM Code: Other urogenital trichomoniasis
HCC Buddy Code Card
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FY 2026 Apr update / Certain infectious and parasitic diseases (A00-B99) / Infections with a predominantly sexual mode of transmission (A50-A64)
A59.09
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceOther urogenital trichomoniasis
This code describes a parasitic infection caused by Trichomonas vaginalis affecting the urinary or genital system in locations other than the urethra or prostate. It's a sexually transmitted infection that can cause inflammation and discharge in the affected area.
CMS-HCC V28
00
RAF 0
CMS-HCC V24
00
RAF 0
ACA/HHS
00
RAF 0
ESRD/PACE
00
RAF 0
RXHCC
00
RAF 0
Code Trumping
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Code Book Path
Inclusion Terms
Official- Trichomonas cervicitis
Excludes 2
OfficialICD-10-CM does not list Excludes 2 notes for A59.09 in this effective period.
Related Child Codes
Includes
OfficialICD-10-CM does not list Includes notes for A59.09 in this effective period.
Excludes 1
OfficialICD-10-CM does not list Excludes 1 notes for A59.09 in this effective period.
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for A59.09 in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for A59.09 in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for A59.09 in this effective period.
Buddy Documentation Tip
Last updated: FY2026 ICD-10-CM Apr update, Apr 1, 2026 through Sep 30, 2026. CMS-HCC V28 is 100% phased in for payment year 2026.
Is A59.09 an HCC code?
No. A59.09 is a billable ICD-10-CM code but does not map to any HCC category in V28, V24, ESRD, or RxHCC.
Coder workflow notes
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This code does not map to an HCC category in any model (V28, V24, ESRD, RxHCC).
What This Code Means
A59.09 is the ICD-10-CM diagnosis code for other urogenital trichomoniasis. This code describes a parasitic infection caused by Trichomonas vaginalis affecting the urinary or genital system in locations other than the urethra or prostate. It's a sexually transmitted infection that can cause inflammation and discharge in the affected area. A59.09 sits in the ICD-10-CM chapter for certain infectious and parasitic diseases (a00-b99), within the section covering infections with a predominantly sexual mode of transmission (a50-a64).
A59.09 is a billable ICD-10-CM code but does not map to a payment HCC under the CMS-HCC V28, V24, ESRD, or RxHCC risk adjustment models. It can be reported on Medicare Advantage encounter data submissions but it does not contribute to a beneficiary's RAF score and therefore does not affect risk-adjusted payments to the plan.
Use this code only when the trichomoniasis affects urogenital sites other than the urethra (A59.01) or prostate (A59.02); documentation should specify the anatomical location affected.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for A59.09 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Use this code only when the trichomoniasis affects urogenital sites other than the urethra (A59.01) or prostate (A59.02); documentation should specify the anatomical location affected
- •Verify that the infection is confirmed as trichomoniasis and not another type of urogenital infection; consider whether the patient is male or female as this may affect site specificity and treatment documentation