A50.4Late congenital neurosyphilis [juvenile neurosyphilis]

A50.4 is the ICD-10-CM diagnosis code for late congenital neurosyphilis [juvenile neurosyphilis]. It belongs to category A50 (congenital syphilis), block A50-A64 (infections with a predominantly sexual mode of transmission) and chapter 1 (certain infectious and parasitic diseases). It is a header code, so it can't be reported by itself; one of its 7 subcodes must be used instead.

Within A50 (congenital syphilis), A50.4 is specifically for late congenital neurosyphilis [juvenile neurosyphilis]. Related codes cover early congenital syphilis, symptomatic (A50.0), early congenital syphilis, latent (A50.1), early congenital syphilis, unspecified (A50.2), late congenital syphilitic oculopathy (A50.3), other late congenital syphilis, symptomatic (A50.5), late congenital syphilis, latent (A50.6), late congenital syphilis, unspecified (A50.7) and unspecified (A50.9).

To report this condition, pick the subcode that matches the documentation: A50.40 (unspecified), A50.41 (meningitis), A50.42 (encephalitis), A50.43 (polyneuropathy), A50.44 (atrophy), A50.45 (paresis) and A50.49 (neurosyphilis).

Don't report A50.4 together with the conditions in its Excludes1 note: Hutchinson's triad (A50.53).

Use an additional code to identify any associated mental disorder.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.