ICD-10 Code A56 – Other sexually transmitted chlamydial diseases (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A56 – Other sexually transmitted chlamydial diseases
What it is
A56 identifies sexually transmitted chlamydial infections that are not classified elsewhere. Use it for chlamydial disease when the record does not specify a more exact site or type.
Clinical signs
Clinical features vary; refer to documentation. Common findings may include genital discharge, dysuria, pelvic or rectal symptoms, or evidence of chlamydial infection at a sexually transmitted site.
When to use this code
Use A56 when the clinician documents an other sexually transmitted chlamydial disease and no more specific ICD-10-CM code applies. It may fit cases with confirmed chlamydial infection that are not described as cervicitis, urethritis, or another named condition.
Check documentation when the site, organism details, or syndrome are unclear. If the record names a specific chlamydial manifestation, code that diagnosis instead of this category.
Do not use for
Do not use A56 for nonsexually transmitted chlamydial infections or for infections with a more specific documented diagnosis. If the chart is vague, check documentation before assigning this code.
Coding tip
Code the most specific documented chlamydial diagnosis first, and use A56 only when the record supports an unspecified other sexually transmitted chlamydial disease.