A53.9

ICD-10Billable

Syphilis, unspecified

Official ICD-10-CM descriptor (FY2026)

Syphilis, unspecified

A53.9 is valid for submission on a claim — CMS flags it as a billable, specific code.

Inclusion terms

  • Infection due to Treponema pallidum NOS
  • Syphilis (acquired) NOS

Excludes1

Not coded here. An Excludes1 code should never be reported at the same time as the code above it.

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

Related codes in A53

Where this code sits

Parent code
A53

Krasyn AI Coder

Get code suggestions automatically as you type notes. Free for 50 analyses.

Install for Chrome — free

Source

ICD-10-CM FY2026. Centers for Medicare & Medicaid Services (CMS) / National Center for Health Statistics (NCHS), “2026 ICD-10-CM Code Descriptions in Tabular Order” (icd10cm_order_2026.txt). Download the original file from cms.gov. Public domain (US Government work). Descriptors, billable flags and instructional notes on this page are reproduced from that file without modification. Krasyn adds no clinical guidance.

Get codes automatically as you write notes. Krasyn AI Coder for Chrome — free for 50 analyses.Install free →