A66.8 ICD-10-CM Code: Latent yaws
HCC Buddy Code Card
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FY 2026 Apr update / Certain infectious and parasitic diseases (A00-B99) / Other spirochetal diseases (A65-A69)
A66.8
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceLatent yaws
Latent yaws is a stage of yaws infection where the disease is present in the body but shows no active symptoms or signs. The person can still transmit the infection to others during this stage.
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
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Code Book Path
Inclusion Terms
Official- Yaws without clinical manifestations, with positive serology
Excludes 2
OfficialICD-10-CM does not list Excludes 2 notes for A66.8 in this effective period.
Related Child Codes
Includes
Official- bouba
- frambesia (tropica)
- pian
Excludes 1
OfficialICD-10-CM does not list Excludes 1 notes for A66.8 in this effective period.
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for A66.8 in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for A66.8 in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for A66.8 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 A66.8 an HCC code?
No. A66.8 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
A66.8 is the ICD-10-CM diagnosis code for latent yaws. Latent yaws is a stage of yaws infection where the disease is present in the body but shows no active symptoms or signs. The person can still transmit the infection to others during this stage. A66.8 sits in the ICD-10-CM chapter for certain infectious and parasitic diseases (a00-b99), within the section covering other spirochetal diseases (a65-a69).
A66.8 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.
Verify documentation specifies 'latent' stage to distinguish from active yaws manifestations (A66.0-A66.7).
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for A66.8 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.