ICD-10-CM > A00-B99 > A50-A64 > A53 > A53.9 A53.9 Syphilis, unspecified Billable/Specific Copy Code Copy Description Applicable To Infection due to Treponema pallidum NOSSyphilis (acquired) NOS Type 1 Excludes syphilis NOS under two years of age (A50.2)