A63.8 ICD-10-CM Code: Other specified predominantly sexually transmitted diseases
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)
A63.8
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceOther specified predominantly sexually transmitted diseases
This code is used for sexually transmitted infections that don't fit into other specific STI categories, such as certain parasitic or bacterial infections spread through sexual contact. It captures less common STIs that still require medical documentation and treatment.
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
OfficialICD-10-CM does not list inclusion terms for A63.8 in this effective period.
Excludes 2
Official- molluscum contagiosum (B08.1)
- papilloma of cervix (D26.0)
Related Child Codes
Includes
OfficialICD-10-CM does not list Includes notes for A63.8 in this effective period.
Excludes 1
OfficialICD-10-CM does not list Excludes 1 notes for A63.8 in this effective period.
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for A63.8 in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for A63.8 in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for A63.8 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 A63.8 an HCC code?
No. A63.8 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
A63.8 is the ICD-10-CM diagnosis code for other specified predominantly sexually transmitted diseases. This code is used for sexually transmitted infections that don't fit into other specific STI categories, such as certain parasitic or bacterial infections spread through sexual contact. It captures less common STIs that still require medical documentation and treatment. A63.8 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).
A63.8 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.
Always review the medical record documentation carefully to identify the specific organism or condition, as this is an 'other specified' code that should only be used when a more specific STI code is not available.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for A63.8 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Always review the medical record documentation carefully to identify the specific organism or condition, as this is an 'other specified' code that should only be used when a more specific STI code is not available
- •Consider whether a more specific ICD-10-CM code exists for the documented condition before defaulting to A63.8, as using specific codes improves data quality and clinical clarity