ICD-10 Code A74 – Other diseases caused by chlamydiae (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A74 – Other diseases caused by chlamydiae
What it is
A74 identifies infections and conditions caused by chlamydial organisms that are not classified elsewhere. Use it when documentation states chlamydial disease but does not name a more specific code.
Clinical signs
Clinical features vary; refer to documentation. Chlamydial disease may present with infection-related findings, but the exact site and organism should be confirmed before coding.
When to use this code
Use A74 when the record clearly documents a chlamydial infection or disease and no more specific ICD-10-CM code applies. It is appropriate when the provider names chlamydiae without further detail. If the chart identifies a specific chlamydial condition, select that code instead.
Do not use for
Do not use A74 for nonspecific genital infections, other bacterial infections, or conditions caused by organisms other than chlamydiae. Check documentation if the diagnosis is incomplete.
Coding tip
Always code the most specific chlamydial diagnosis documented; use A74 only when the record supports a chlamydial disease but lacks a better option.