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ICD-10 diagnosis code

A51.9 Early syphilis, unspecified

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A51.9 is the ICD-10 code for Early syphilis, unspecified. It is a four-character subcategory of A51 (Early 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

A51.9 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

A51.9Tidig syfilis, ospecificerad

NorwayICD-10-NO

A51.9Uspesifisert tidlig syfilis

DenmarkICD-10-DK

DA519Frisk syfilis UNS

FinlandICD-10-FI

A51.9Määrittämätön varhaiskuppa

GermanyICD-10-GM

A51.9Frühsyphilis, nicht näher bezeichnet

FranceICD-10-FR

A51.9Syphilis précoce, sans précision

NetherlandsICD-10-NL

A51.9vroege syfilis, niet-gespecificeerd

United StatesICD-10-CM

A51.9Early syphilis, 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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