ICD-10-CM · Chapter 1

A53..9 Syphilis, unspecified

Billable

← A53 — Other and unspecified syphilis Chapter 1: A00-B99

Includes

Infection due to Treponema pallidum NOS
Syphilis (acquired) NOS

Excludes 1 (cannot be coded together)

syphilis NOS under two years of age (A50.2)

Last reviewed: September 2026