ICD-10 Code A50.5 – Other late congenital syphilis, symptomatic (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A50.5 – Other late congenital syphilis, symptomatic
What it is
This code identifies symptomatic late congenital syphilis in a child or adult with evidence of infection acquired before birth. Use it when the record describes late manifestations that do not fit a more specific congenital syphilis code.
Clinical signs
Clinical features vary; refer to documentation. Findings may include signs of late congenital infection such as bone, dental, eye, ear, or neurologic involvement, but you should code only what is clearly documented.
When to use this code
Use A50.5 when the provider documents late congenital syphilis with symptoms and no more specific late congenital syphilis code applies. It is appropriate when the condition is confirmed as congenital and the record supports active clinical manifestations. Check documentation if the note only says “history of syphilis” or does not specify congenital disease.
Do not use for
Do not use this code for acquired syphilis, asymptomatic congenital infection, or unspecified neonatal exposure. If the chart does not clearly indicate symptomatic late congenital disease, check documentation before assigning A50.5.
Coding tip
Code the congenital diagnosis only when the provider links the manifestations to late congenital syphilis and documents symptoms, not just serology or exposure.