ICD-10 Code A56.4 – Chlamydial infection of pharynx (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A56.4 – Chlamydial infection of pharynx
What it is
This code identifies a Chlamydia trachomatis infection affecting the pharynx, or throat. Use it when the documentation specifically states pharyngeal chlamydial infection.
Clinical signs
Clinical features vary; refer to documentation. Many cases are asymptomatic, while others may show sore throat, pharyngeal irritation, or findings consistent with sexually transmitted exposure.
When to use this code
Use A56.4 when the provider documents chlamydial infection of the pharynx, including confirmed or clinically diagnosed cases. It is appropriate when the throat is the site of infection and the organism is identified as Chlamydia trachomatis. If the site is not specified, check documentation.
Do not use for
Do not use this code for nonspecific pharyngitis, gonococcal infection, or chlamydial infection at another anatomic site. Check documentation if the record only says “chlamydia” without pharyngeal involvement.
Coding tip
Verify both the organism and the anatomic site before assigning A56.4.