2026 ICD-10-CM Diagnosis Code A50Congenital syphilis

ICD-10-CM Codes›A00–B99›A50-A64›A50

ICD-10-CM A50
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

A50 is a non-billable ICD-10-CM category code for congenital syphilis, so it cannot be submitted on claims. Use a more specific code from this category instead, such as A50.01, A50.02, A50.03, and A50.04.

Code Identity

ICD-10-CM Code
A50
Billable Status
No — Non-Billable Category
Code Describes
Congenital syphilis
Chapter
A50-A64
Infections with a predominantly sexual mode of transmission

Code Classification

ChapterA00–B99Certain infectious and parasitic diseases
SectionA50-A64Infections with a predominantly sexual mode of transmission
CategoryA50Congenital syphilis
This CodeA50Congenital syphilis

Specific Coding for Congenital syphilisOverview

Non-specific codes like A50 require more characters. Use one of these billable codes instead:

  • A50.0 for Early congenital syphilis, symptomatic

  • Use A50.01 for Early congenital syphilitic oculopathy

  • Use A50.02 for Early congenital syphilitic osteochondropathy

  • Use A50.03 for Early congenital syphilitic pharyngitis

  • Use A50.04 for Early congenital syphilitic pneumonia

  • Use A50.05 for Early congenital syphilitic rhinitis

  • Use A50.06 for Early cutaneous congenital syphilis

  • Use A50.07 for Early mucocutaneous congenital syphilis

  • Use A50.08 for Early visceral congenital syphilis

  • Use A50.09 for Other early congenital syphilis, symptomatic

  • Use A50.1 for Early congenital syphilis, latent

  • Use A50.2 for Early congenital syphilis, unspecified

  • A50.3 for Late congenital syphilitic oculopathy

  • Use A50.30 for Late congenital syphilitic oculopathy, unspecified

  • Use A50.31 for Late congenital syphilitic interstitial keratitis

  • Use A50.32 for Late congenital syphilitic chorioretinitis

  • Use A50.39 for Other late congenital syphilitic oculopathy

  • A50.4 for Late congenital neurosyphilis [juvenile neurosyphilis]

  • Use A50.40 for Late congenital neurosyphilis, unspecified

  • Use A50.41 for Late congenital syphilitic meningitis

  • Use A50.42 for Late congenital syphilitic encephalitis

  • Use A50.43 for Late congenital syphilitic polyneuropathy

  • Use A50.44 for Late congenital syphilitic optic nerve atrophy

  • Use A50.45 for Juvenile general paresis

  • Use A50.49 for Other late congenital neurosyphilis

  • A50.5 for Other late congenital syphilis, symptomatic

  • Use A50.51 for Clutton's joints

  • Use A50.52 for Hutchinson's teeth

  • Use A50.53 for Hutchinson's triad

  • Use A50.54 for Late congenital cardiovascular syphilis

  • Use A50.55 for Late congenital syphilitic arthropathy

  • Use A50.56 for Late congenital syphilitic osteochondropathy

  • Use A50.57 for Syphilitic saddle nose

  • Use A50.59 for Other late congenital syphilis, symptomatic

  • Use A50.6 for Late congenital syphilis, latent

  • Use A50.7 for Late congenital syphilis, unspecified

  • Use A50.9 for Congenital syphilis, unspecified

Clinical InformationClinical

  • Congenital Syphilis

    a life-threatening bacterial infection of the newborn caused by treponema pallidum. it is transmitted to the infant from a mother with syphilis through the placenta during pregnancy. signs and symptoms include irritability, fever, failure to thrive, saddle nose, cutaneous rash, and pneumonia.

  • Late Latent Congenital Syphilis

    the occurrence of syphilis symptoms in individuals who were infected before or during birth and have not exhibited signs of the disease for over a year.

Patient EducationClinical

Syphilis

Syphilis is a sexually transmitted infection (STI) caused by bacteria. It infects the genital area, lips, mouth, or anus of both men and women. You usually get syphilis from sexual contact with someone who has it. It can also pass from mother to baby during pregnancy.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About A50Overview

Is A50 (Congenital syphilis) a billable code?

No. This is a category header that groups the codes for congenital syphilis, and headers cannot be submitted on claims. Claims for congenital syphilis need a more specific code from this category, such as A50.01, A50.02, and A50.03.