What does ICD-10 code A74 mean?

ICD-10 code A74 is the standardized code used for other diseases caused by chlamydiae in medical records and coding systems.

When is ICD-10 code A74 used?

Doctors, hospitals, and insurers may use ICD-10 code A74 when recording other diseases caused by chlamydiae in a standardized format. This entry may also act as a broader category that points toward more specific child codes.

Does ICD-10 code A74 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 A74: Other diseases caused by chlamydiae

Name: ICD-10 Code A74: Other diseases caused by chlamydiae
Creator: HealthAssure Clinical Team
Published: 2026-05-21T06:00:48.478Z

A74 is an ICD-10 diagnosis entry used to group records related to Other diseases caused by chlamydiae. 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 diseases caused by chlamydiae 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

A70-A74Other diseases caused by chlamydiae

currentA70-A74

Official coding notes

Excludes1 (do not code together)

neonatal chlamydial conjunctivitis (P39.1)
neonatal chlamydial pneumonia (P23.1)
Reiter's disease (M02.3-)
sexually transmitted chlamydial diseases (A55-A56)

Excludes2 (may code together if documented)

chlamydial pneumonia (J16.0)

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

A70Chlamydia psittaci infectionsbillable A71Trachoma

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

A74

Replacement codes

A74.0 — Chlamydial conjunctivitisA74.9 — Chlamydial infection, unspecified

Common synonyms

Other diseases caused by chlamydiae

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.