A52.00 is not a CMS-HCC payment code. MEAT criteria · RAF Calculator · HCC coding software

ICD-10-CM Code View

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Code lookupA52.00

Effective periodFY2026 Apr Update (Apr 1-Sep 30)

FY 2026 Apr update / Certain infectious and parasitic diseases (A00-B99) / Infections with a predominantly sexual mode of transmission (A50-A64)

A52.00

Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidance

Cardiovascular syphilis, unspecified

This code describes syphilis that has spread to and is affecting the heart and blood vessels, but the specific type or location of damage is not specified. It represents a late-stage complication of untreated syphilis infection.

Overview Risk Models Code Book Documentation Audit Notes Edition comparison

CMS-HCC V28

N/A

—

Not risk-adjusted for this model/period.

Not mapped

CMS-HCC V24

Historical

Not used for standard CY2026 Medicare Advantage payment. Select a historical period to review V24.

Not used for CY2026 payment

ACA/HHS

Mapped

HCC 135

HHS-HCC 135 adult, RAF varies...

Code-level coefficient reference

ESRD/PACE

N/A

—

Not risk-adjusted for this model/period.

Not mapped

RXHCC

N/A

—

Not risk-adjusted for this model/period.

Not mapped

Code Book Path

Official

A52Late syphilis A52.0Cardiovascular and cerebrovascular syphilis A52.00Cardiovascular syphilis, unspecified

Inclusion Terms

Official

No inclusion terms are included in this display for A52.00. Check the code and parent instructions in the Code Book.

Excludes 2

Official

carrier or suspected carrier of infectious disease (Z22.-)Inherited from A00-B99, A50-A64
infectious and parasitic diseases complicating pregnancy, childbirth and the puerperium (O98.-)Inherited from A00-B99, A50-A64
infectious and parasitic diseases specific to the perinatal period (P35-P39)Inherited from A00-B99, A50-A64
influenza and other acute respiratory infections (J00-J22)Inherited from A00-B99, A50-A64
human immunodeficiency virus [HIV] disease (B20)Inherited from A00-B99, A50-A64

Related Codes

Official

A52.01Syphilitic aneurysm of aorta A52.02Syphilitic aortitis A52.03Syphilitic endocarditis A52.04Syphilitic cerebral arteritis A52.05Other cerebrovascular syphilis

Includes

Official

diseases generally recognized as communicable or transmissibleInherited from A00-B99

Excludes 1

Official

certain localized infections - see body system-related chaptersInherited from A00-B99, A50-A64
nonspecific and nongonococcal urethritis (N34.1)Inherited from A00-B99, A50-A64
Reiter's disease (M02.3-)Inherited from A00-B99, A50-A64

Code First

Official

No Code First sequencing instructions are included in this display for A52.00. Check the code and parent instructions in the Code Book.

Use Additional

Official

code to identify resistance to antimicrobial drugs (Z16.-)Inherited from A00-B99

Code Also

Official

No Code Also instructions are included in this display for A52.00. Check the code and parent instructions in the Code Book.

Buddy Documentation Tip

HCC Buddy guidance

Use this code only when cardiovascular involvement from syphilis is documented but the specific manifestation (such as aortitis, aneurysm, or valve disease) is not clearly specified; if a specific cardiovascular manifestation is documented, use a more specific A52.0x code

Verify that the patient has a confirmed syphilis diagnosis and that cardiovascular involvement is explicitly documented in the medical record before assigning this code

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 A52.00 an HCC code?

Code: A52.00
Description: Cardiovascular syphilis, unspecified
HCC (V28): No CMS-HCC V28 mapping
RAF reference coefficient: —
Billable: Yes
Payment year: 2026

Coder workflow notes

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What This Code Means

A52.00 is the ICD-10-CM diagnosis code for cardiovascular syphilis, unspecified. This code describes syphilis that has spread to and is affecting the heart and blood vessels, but the specific type or location of damage is not specified. It represents a late-stage complication of untreated syphilis infection. A52.00 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).

A52.00 has no mapping under the current CMS-HCC V28 community payment model. A52.00 also appears in the HHS-HCC commercial risk model (HCC 135 (HHS-HCC 135 adult, RAF varies by metal level)), which is a commercial market model rather than a Medicare Advantage payment mapping. Do not assign V28 risk adjustment value from this page; verify the applicable model and payment year before using this code for risk adjustment.

HCC Buddy maintains structured V28 and V24 mapping, source-labeled coefficient references, and MEAT documentation criteria for A52.00 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 cardiovascular involvement from syphilis is documented but the specific manifestation (such as aortitis, aneurysm, or valve disease) is not clearly specified; if a specific cardiovascular manifestation is documented, use a more specific A52.0x code
•Verify that the patient has a confirmed syphilis diagnosis and that cardiovascular involvement is explicitly documented in the medical record before assigning this code