What does ICD-10 code A56 mean?

ICD-10 code A56 is the standardized code used for other sexually transmitted chlamydial diseases in medical records and coding systems.

When is ICD-10 code A56 used?

Doctors, hospitals, and insurers may use ICD-10 code A56 when recording other sexually transmitted chlamydial diseases in a standardized format. This entry may also act as a broader category that points toward more specific child codes.

Does ICD-10 code A56 confirm a diagnosis?

No. A code helps standardize documentation and claims, but it should not be read as a substitute for a clinician's full assessment.

ICD10

ICD-10 Code A56: Other sexually transmitted chlamydial diseases

Name: ICD-10 Code A56: Other sexually transmitted chlamydial diseases
Creator: HealthAssure Clinical Team
Published: 2026-05-21T06:00:44.487Z

A56 is an ICD-10 diagnosis entry used to group records related to Other sexually transmitted chlamydial diseases. You may see this entry in coding references, medical records, or claims workflows when a broader diagnosis category is being reviewed before a more specific code is chosen. ICD-10 entries help standardize how diagnoses are organized for coding, reporting, analytics, and documentation. This code sits within the broader ICD-10 area for Certain infectious and parasitic diseases (A00-B99).

Reviewed by HealthAssure Clinical TeamUpdated 21 May 2026

What is this code?

ICD-10 entries help standardize how diagnoses are organized for coding, reporting, analytics, and documentation. This code sits within the broader ICD-10 area for Certain infectious and parasitic diseases (A00-B99).

When is it used?

May be used when a clinician documents other sexually transmitted chlamydial diseases in a patient's medical record.
May appear in hospital records, claims, referrals, and clinical documentation.
This code may act more like a grouping or parent code, so a more specific child code may be used in final documentation when available.

What it does not mean

A code alone does not explain severity, treatment plan, or outcome.
A medical code should not be treated as a substitute for a doctor's diagnosis or advice.
This entry may represent a broader category rather than the most specific billable code.

Code hierarchy

chapter

1Certain infectious and parasitic diseases (A00-B99)

block

A50-A64Infections with a predominantly sexual mode of transmission

currentA50-A64

Official coding notes

Includes

sexually transmitted diseases due to Chlamydia
trachomatis

Excludes1 (do not code together)

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

Excludes2 (may code together if documented)

chlamydial lymphogranuloma (A55)
conditions classified to A74.-

Where you may see this code

You may see this entry in coding references, medical records, or claims workflows when a broader diagnosis category is being reviewed before a more specific code is chosen.

Related specialists

Infectious Disease SpecialistGeneral Physician

Sibling codes

A50Congenital syphilis A51Early syphilis A52Late syphilis A53Other and unspecified syphilis A54Gonococcal infection A55Chlamydial lymphogranuloma (venereum)billable A57Chancroidbillable A58Granuloma inguinalebillable A59Trichomoniasis A60Anogenital herpesviral [herpes simplex] infections A63Other predominantly sexually transmitted diseases, not elsewhere classified A64Unspecified sexually transmitted diseasebillable

Coding guidelines

Compatibility

Legacy code aligns to an official FY 2026 category. Frontend should resolve to the official category page and surface the billable child codes.

Legacy codes

A56

Replacement codes

A56.2 — Chlamydial infection of genitourinary tract, unspecifiedA56.3 — Chlamydial infection of anus and rectumA56.4 — Chlamydial infection of pharynxA56.8 — Sexually transmitted chlamydial infection of other sites

Common synonyms

Other sexually transmitted chlamydial diseases

Frequently asked questions

About this content

This page is prepared by HealthAssure's clinical team using official coding standards from ICD-10. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.