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A74.9 — Chlamydial infection, unspecified
A74.9
What this code means
Chlamydia is a very common sexually transmitted bacterial infection that often causes no symptoms.
Also called: chlamydia, chlamydial infection.
When this code is used
Used for chlamydial infection when the site is not specified.
Where it sits in ICD-10-CM
Code A74.9 belongs to Chapter 1: Infectious and parasitic diseases, which covers codes A00–B99 in the FY2027 ICD-10-CM tabular list. The official description above is copied verbatim from the CDC/NCHS FY2027 code file.
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Frequently asked questions
What is ICD-10-CM code A74.9?
A74.9 is the ICD-10-CM diagnosis code for “Chlamydial infection, unspecified”. Chlamydia is a very common sexually transmitted bacterial infection that often causes no symptoms.
When is code A74.9 used?
Used for chlamydial infection when the site is not specified. It belongs to Chapter 1 of ICD-10-CM (Infectious and parasitic diseases).
This guide explains ICD-10-CM codes in plain language for patients, students and other readers. It is educational information only — not coding, billing or medical advice. The code recorded for any real encounter is assigned from the full clinical documentation by the treating team and qualified coders, and only they can decide which code fits a specific case.