What is ICD-10 code A50.53?

A50.53 is the ICD-10-CM diagnosis code for Hutchinson's triad. It belongs to the ICD-10-CM chapter for certain infectious and parasitic diseases (a00-b99). A50.53 is a billable code, meaning it can be reported on a claim as a primary or secondary diagnosis when supported by documentation. A50.53 is part of the FY2026 ICD-10-CM code set published by the CMS National Center for Health Statistics and used on Medicare, Medicaid, and commercial claims in the United States.

Yes. A50.53 is a billable ICD-10-CM code that can be reported on professional and institutional claims as a primary or secondary diagnosis when the provider documentation supports the specific condition described. Billable codes in ICD-10-CM are coded to the highest level of specificity available for the documented diagnosis. A50.53 is current for fiscal year 2026 and remains in the active CMS ICD-10-CM code set published by the National Center for Health Statistics.

Which HCC does A50.53 map to under V28?

A50.53 has no payable CMS-HCC V28 mapping in the final FY2026 CMS file.

What RAF reference is published for A50.53?

A50.53 has no V28 reference coefficient because the final FY2026 source verifies no payable V28 mapping.

What is the V28 vs V24 difference for A50.53?

A50.53 has verified no payable V28 mapping in the final FY2026 source. Select a historical effective period before making any V24 comparison.

2026 ICD-10-CM A50.53: Hutchinson's triad

A50.53 is not a CMS-HCC payment code. MEAT criteria · RAF Calculator · HCC coding software

ICD-10-CM Code View

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Code lookupA50.53

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)

A50.53

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

Hutchinson's triad

Hutchinson's triad is a set of three specific signs of late congenital syphilis that typically appear in childhood, including dental abnormalities (peg-shaped teeth), eye problems (interstitial keratitis), and eighth nerve deafness. This condition results from untreated syphilis passed from mother to child during pregnancy.

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

N/A

—

Not risk-adjusted for this model/period.

Not mapped

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

A50Congenital syphilis A50.5Other late congenital syphilis, symptomatic A50.53Hutchinson's triad

Inclusion Terms

Official

Any congenital syphilitic condition specified as late or manifest two years or more after birth.Inherited from A50.5

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

A50.51Clutton's joints A50.52Hutchinson's teeth A50.54Late congenital cardiovascular syphilis A50.55Late congenital syphilitic arthropathy A50.56Late congenital syphilitic osteochondropathy

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 A50.53. 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 A50.53. Check the code and parent instructions in the Code Book.

Buddy Documentation Tip

HCC Buddy guidance

A50.53 is specific to Hutchinson's triad manifestations; verify documentation confirms all three classic signs are present before assigning this code

This code is part of the A50 category for congenital syphilis; ensure the maternal syphilis history is documented and coded separately if applicable

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 A50.53 an HCC code?

No. A50.53 is a billable ICD-10-CM code with no mapping under the CMS-HCC V28 or V24 community payment models, and none under the ESRD, Part D RxHCC, or HHS-HCC models.

Code: A50.53
Description: Hutchinson's triad
HCC (V28): No CMS-HCC V28 mapping
RAF reference coefficient: —
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

A50.53 is the ICD-10-CM diagnosis code for hutchinson's triad. Hutchinson's triad is a set of three specific signs of late congenital syphilis that typically appear in childhood, including dental abnormalities (peg-shaped teeth), eye problems (interstitial keratitis), and eighth nerve deafness. This condition results from untreated syphilis passed from mother to child during pregnancy. A50.53 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).

A50.53 is a billable ICD-10-CM code, but the current payload does not show a mapping under the CMS-HCC V28 or V24 community payment models, and none under the ESRD, Part D RxHCC, or HHS-HCC models. Do not assign risk adjustment value from this page when no source-backed mapping is shown; verify the applicable model and payment year.

A50.53 is specific to Hutchinson's triad manifestations; verify documentation confirms all three classic signs are present before assigning this code.

HCC Buddy maintains structured V28 and V24 mapping, source-labeled coefficient references, and MEAT documentation criteria for A50.53 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

•A50.53 is specific to Hutchinson's triad manifestations; verify documentation confirms all three classic signs are present before assigning this code
•This code is part of the A50 category for congenital syphilis; ensure the maternal syphilis history is documented and coded separately if applicable