A51.39 ICD-10-CM Code: Other secondary syphilis of skin
HCC Buddy Code Card
Digital ICD-10 code-book layout with official code detail, always-visible risk models, Code Trumping, and Buddy coding guidance.
FY 2026 Apr update / Certain infectious and parasitic diseases (A00-B99) / Infections with a predominantly sexual mode of transmission (A50-A64)
A51.39
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceOther secondary syphilis of skin
This code describes a skin manifestation of secondary syphilis that doesn't fit into other specified categories. Secondary syphilis occurs weeks to months after initial infection and can cause various rashes and skin lesions.
CMS-HCC V28
N/A—
Not mapped
CMS-HCC V24
N/A—
Not mapped
ACA/HHS
N/A—
Not mapped
ESRD/PACE
N/A—
Not mapped
RXHCC
N/A—
Not mapped
Code Book Path
Inclusion Terms
Official- Syphilitic leukoderma
- Syphilitic mucous patch
Excludes 2
OfficialICD-10-CM does not list Excludes 2 notes for A51.39 in this effective period.
Related Child Codes
Includes
OfficialICD-10-CM does not list Includes notes for A51.39 in this effective period.
Excludes 1
Official- late syphilitic leukoderma (A52.79)
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for A51.39 in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for A51.39 in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for A51.39 in this effective period.
Buddy Documentation Tip
Current with CMS: FY2026 ICD-10-CM Apr 1 update (effective Apr 1 – Sep 30, 2026) · CMS-HCC V28, 100% phased in for payment year 2026. FY2027 code set already staged for October 1, 2026. How HCC Buddy stays current →
Is A51.39 an HCC code?
No. A51.39 is a billable ICD-10-CM code but does not map to any HCC category in V28, V24, ESRD, or RxHCC.
- Code
- A51.39
- Description
- Other secondary syphilis of skin
- HCC (V28)
- No CMS-HCC V28 mapping
- RAF
- —
- Billable
- Yes
- Payment year
- 2026
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
A51.39 is the ICD-10-CM diagnosis code for other secondary syphilis of skin. This code describes a skin manifestation of secondary syphilis that doesn't fit into other specified categories. Secondary syphilis occurs weeks to months after initial infection and can cause various rashes and skin lesions. A51.39 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).
A51.39 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 skin manifestation of secondary syphilis is not better described by more specific codes (A51.31 for condyloma latum, A51.32 for mucous patches, A51.33 for other rashes).
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for A51.39 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 skin manifestation of secondary syphilis is not better described by more specific codes (A51.31 for condyloma latum, A51.32 for mucous patches, A51.33 for other rashes)
- •Always verify the stage of syphilis (primary, secondary, latent, or tertiary) is documented before coding, as this affects code selection and treatment decisions
Excludes 1, Do NOT code together
- late syphilitic leukoderma (A52.79)