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ICD-10 diagnosis code

A53.9 Syphilis, unspecified

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A53.9 is the ICD-10 code for Syphilis, unspecified. It is a four-character subcategory of A53 (Other and unspecified syphilis), the most specific level in the WHO edition. It belongs to the block A50–A64 (Infections with a predominantly sexual mode of transmission) in Chapter I, Certain infectious and parasitic diseases.

Code type
Subcategory (4 characters)
Chapter
I · A00–B99
Classification
WHO ICD-10, 2019 version

What A53.9 includes

Conditions and terms that are coded here.

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

What A53.9 excludes

Conditions that look similar but belong under another code.

  • syphilis NOS causing death under two years of age A50.2

A53.9 in national editions

Countries report with their own edition of ICD-10. Most keep the WHO code and add more specific codes beneath it.

SwedenICD-10-SE

A53.9Syfilis ospecificerad

NorwayICD-10-NO

A53.9Uspesifisert syfilis

DenmarkICD-10-DK

DA539Syfilis UNS

FinlandICD-10-FI

A53.9Määrittämätön kuppa

GermanyICD-10-GM

A53.9Syphilis, nicht näher bezeichnet

FranceICD-10-FR

A53.9Syphilis, sans précision

NetherlandsICD-10-NL

A53.9syfilis, niet-gespecificeerd

United StatesICD-10-CM

A53.9Syphilis, unspecified

Based on the World Health Organization’s International Statistical Classification of Diseases and Related Health Problems, 10th revision (ICD-10), 2019 version, and the national editions published by each country’s health authority. This page is a reference, not coding advice; follow your national coding rules when you report.

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