A52.09 ICD-10-CM Code: Other cardiovascular syphilis
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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)
A52.09
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceOther cardiovascular syphilis
This code describes syphilis that affects the heart and blood vessels in ways other than the more common forms like aortic aneurysm or aortic regurgitation. It represents late-stage syphilis complications involving the cardiovascular system.
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
OfficialICD-10-CM does not list inclusion terms for A52.09 in this effective period.
Excludes 2
OfficialICD-10-CM does not list Excludes 2 notes for A52.09 in this effective period.
Related Child Codes
Includes
OfficialICD-10-CM does not list Includes notes for A52.09 in this effective period.
Excludes 1
OfficialICD-10-CM does not list Excludes 1 notes for A52.09 in this effective period.
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for A52.09 in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for A52.09 in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for A52.09 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 A52.09 an HCC code?
No. A52.09 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
A52.09 is the ICD-10-CM diagnosis code for other cardiovascular syphilis. This code describes syphilis that affects the heart and blood vessels in ways other than the more common forms like aortic aneurysm or aortic regurgitation. It represents late-stage syphilis complications involving the cardiovascular system. A52.09 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).
A52.09 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.
Verify the specific cardiovascular manifestation in the medical record (such as myocarditis, pericarditis, or coronary artery involvement) to ensure A52.09 is the most appropriate code rather than a more specific cardiovascular syphilis code.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for A52.09 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Verify the specific cardiovascular manifestation in the medical record (such as myocarditis, pericarditis, or coronary artery involvement) to ensure A52.09 is the most appropriate code rather than a more specific cardiovascular syphilis code
- •Confirm the stage of syphilis (late/tertiary) is documented, as cardiovascular involvement typically occurs in late syphilis; coordinate with the primary syphilis diagnosis code if applicable