U.S. ICD-10-CM · FY 2027

A53.9 ICD-10-CM Code: Syphilis, unspecified

A clear reference for the official code description, hierarchy, and related coding information from the FY 2027 U.S. release.

Code definition

Official description

A53.9

Syphilis, unspecified

ICD-10-CM diagnosis code · United States clinical modification

Classification

Where A53.9 sits

  1. 1

    Chapter 1

    Certain infectious and parasitic diseases (A00-B99)

  2. 2

    Section

    Infections with a predominantly sexual mode of transmission (A50-A64)

  3. 3

    Category A53

    Other and unspecified syphilis

  4. 4

    Code A53.9

    Syphilis, unspecified

Documentation details

Notes for this code

Inclusion terms

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

Code first

No “code first” instruction is listed for A53.9.

Use additional code

No “use additional code” instruction is listed for A53.9.

Excludes1

Conditions that should not be reported together with this code.

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

Excludes2

Conditions not included here that may be reported separately when present.

No Excludes2 note is listed for A53.9.

Transparency

Source and release

Data release

U.S. ICD-10-CM · FY 2027

Effective date

Oct 1, 2026

Publisher

Vero Scribe Inc.

This reference is generated from Vero’s ICD-10-CM description, hierarchy, and code-note dataset. The visible content and structured data share that source.

Review the CDC/NCHS ICD-10-CM source

Code-specific guidance

Frequently asked questions

What does ICD-10-CM code A53.9 mean?

A53.9 is the FY 2027 U.S. ICD-10-CM code for “Syphilis, unspecified.”

Is A53.9 a billable or specific ICD-10-CM code?

Yes. In the FY 2027 reference data used on this page, A53.9 has no child codes and is presented as a billable/specific code. Always confirm the active code set and payer requirements before use.

Where is A53.9 located in ICD-10-CM?

A53.9 is listed in Chapter 1, Certain infectious and parasitic diseases (A00-B99), within Infections with a predominantly sexual mode of transmission (A50-A64) (A50–A64), under category A53, Other and unspecified syphilis.

What coding notes are listed for A53.9?

Its listed inclusion terms are Infection due to Treponema pallidum NOS; Syphilis (acquired) NOS. No code-first instruction is listed. Excludes1 notes: syphilis NOS under two years of age (A50.2). No Excludes2 note is listed.

Keep exploring

Related A53 codes

A53.0

Latent syphilis, unspecified as early or late

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