A50.6 Late congenital syphilis, latent

The ICD-10-CM code for Late congenital syphilis, latent is A50.6 (FY2026). It is a billable, claim-ready diagnosis code.

Classification

Chapter

1: Certain infectious and parasitic diseases (A00-B99)

Section

A50-A64: Infections with a predominantly sexual mode of transmission (A50-A64)

Category A50

38 codes (33 billable)

FY2026 Status

Stable since FY2024

Also Known As

ICD-10-CM Alphabetic Index entries that lead to A50.6:

• Syphilis, syphilitic (acquired) › congenital › late, or 2 years or more after birth NEC › latent (without manifestations)
• Syphilis, syphilitic (acquired) › congenital › late, or 2 years or more after birth NEC › latent (without manifestations) › serology positive
• Syphilis, syphilitic (acquired) › congenital › late, or 2 years or more after birth NEC › latent (without manifestations) › negative spinal fluid test

Inclusion Terms

• Congenital syphilis without clinical manifestations, with positive serological reaction and negative spinal fluid test, two years or more after birth.

U.S. Hospital Utilization

A50.6 appeared in too few sampled U.S. inpatient stays in 2023 to report a national estimate (AHRQ suppresses counts of 10 or fewer) — a rare inpatient diagnosis.

Source: National Inpatient Sample (NIS), Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality, 2016–2023. National survey-weighted estimates.

Official Coding Guidelines

HIV Infections (TOC entry)

a. Human Immunodeficiency Virus (HIV) Infections .............................................................. 19

Infectious agents causing diseases in other chapters (TOC)

b. Infectious agents as the cause of diseases classified to other chapters ................................. 22

Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026

References

• CMS — ICD-10-CM Official Code Set and Guidelines, FY2026
• CDC/NCHS — ICD-10-CM Files and Browser Tool
• AHRQ — HCUP National Inpatient Sample, Frequencies by Diagnosis Code (2016–2023)

Cite This Page

Reference A50.6 with the canonical source and edition:

A50.6 — Late congenital syphilis, latent. ICD-10 Coding Pro (ICD-10-CM FY2026). https://icd10codingpro.com/codes/A50.6

Canonical URL: https://icd10codingpro.com/codes/A50.6