ICD-10 Code A74.9 – Chlamydial infection, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A74.9 – Chlamydial infection, unspecified
What it is
A74.9 identifies a chlamydial infection when the site or specific manifestation is not documented. Use it for confirmed chlamydial infection that cannot be further classified from the record.
Clinical signs
Clinical features vary; refer to documentation. Chlamydial infection may present with genitourinary symptoms, but the unspecified code is used when the chart confirms infection without a more exact diagnosis.
When to use this code
Use A74.9 when the provider documents chlamydial infection and does not specify the anatomic site or type. It is appropriate when the note only states “chlamydial infection” or similar wording. If the record identifies a specific chlamydial condition, code that diagnosis instead.
Do not use for
Do not use this code for a suspected infection without confirmation. Do not use it when the documentation supports a more specific chlamydial diagnosis or another sexually transmitted infection.
Coding tip
Review the full note for site, manifestation, or organism details before assigning the unspecified code.