A50.6 ICD-10-CM Code: Late congenital syphilis, latent

A50.6 is the ICD-10-CM diagnosis code for late congenital syphilis, latent. This is a late-stage syphilis infection that was passed from mother to child before birth, where the person shows no active symptoms but still carries the infection. The disease is in a dormant or hidden state, meaning it's not currently causing noticeable problems but could potentially become active later. A50.6 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).

A50.6 is a billable ICD-10-CM code but does not map to a payment HCC under the CMS-HCC V28, V24, ESRD, or RxHCC risk adjustment models. It can be reported on Medicare Advantage encounter data submissions but it does not contribute to a beneficiary's RAF score and therefore does not affect risk-adjusted payments to the plan.

This code is used for congenital syphilis cases diagnosed after age 2 years with no clinical manifestations; ensure documentation confirms latent status and congenital origin.