U.S. ICD-10-CM · FY 2027

A56 ICD-10-CM Code: Other sexually transmitted chlamydial diseases

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

Code definition

Official description

A56

Other sexually transmitted chlamydial diseases

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

Classification

Where A56 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 A56

    Other sexually transmitted chlamydial diseases

  4. 4

    Code A56

    Other sexually transmitted chlamydial diseases

More specific choices

Codes under A56

A56 is a non-billable category. Choose the child code that best matches the documented diagnosis.

A56.0

Chlamydial infection of lower genitourinary tract

A56.1

Chlamydial infection of pelviperitoneum and other genitourinary organs

A56.2

Chlamydial infection of genitourinary tract, unspecified

A56.3

Chlamydial infection of anus and rectum

A56.4

Chlamydial infection of pharynx

A56.8

Sexually transmitted chlamydial infection of other sites

Documentation details

Notes for this code

Inclusion terms

No inclusion terms are listed for A56.

Code first

No “code first” instruction is listed for A56.

Use additional code

No “use additional code” instruction is listed for A56.

Excludes1

Conditions that should not be reported together with this code.

  • neonatal chlamydial conjunctivitis (P39.1)
  • neonatal chlamydial pneumonia (P23.1)

Excludes2

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

  • chlamydial lymphogranuloma (A55)
  • conditions classified to A74.-

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 A56 mean?

A56 is the FY 2027 U.S. ICD-10-CM code for “Other sexually transmitted chlamydial diseases.”

Is A56 a billable or specific ICD-10-CM code?

No. A56 has more specific child codes in the FY 2027 reference data. Select the code that matches the documentation and confirm the active code set and payer requirements.

Where is A56 located in ICD-10-CM?

A56 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 A56, Other sexually transmitted chlamydial diseases.

What coding notes are listed for A56?

No inclusion terms are listed for A56 in this reference record. No code-first instruction is listed. Excludes1 notes: neonatal chlamydial conjunctivitis (P39.1); neonatal chlamydial pneumonia (P23.1). Excludes2 notes: chlamydial lymphogranuloma (A55); conditions classified to A74.-.

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