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A56

Non-billable

Other sexually transmitted chlamydial diseases

A56 is the ICD-10-CM code for Other sexually transmitted chlamydial diseases. It is a non-billable category code — use a more specific child code such as A56.0 for billing.

Status
Header (non-billable)
Chapter
A00-B99
Subcodes
6
Edition
FY2026

A00-B99 Certain infectious and parasitic diseases

What this means — in plain language

MedlinePlus · NIH

What is chlamydia? Chlamydia is a common sexually transmitted infection (STI). It is caused by bacteria called Chlamydia trachomatis . Anyone can get chlamydia. It often doesn't cause symptoms, so people may not know that they have it. Antibiotics can cure it. But if it's not treated, chlamydia can cause serious health problems. How is chlamydia spread? You can get chlamydia during oral, vaginal, or anal sex with…

Read more about Chlamydia Infections at MedlinePlus ↗

Source: U.S. National Library of Medicine (MedlinePlus). Informational only — not medical advice.

Includes

  • •sexually transmitted diseases due to Chlamydia
  • •trachomatis

Excludes1 — not coded here

  • •neonatal chlamydial conjunctivitis (P39.1)
  • •neonatal chlamydial pneumonia (P23.1)

Excludes2 — not included here

  • •chlamydial lymphogranuloma (A55)
  • •conditions classified to A74.-

Frequently asked questions

What is ICD-10 code A56?
A56 is the ICD-10-CM code for "Other sexually transmitted chlamydial diseases". It falls under A00-B99 Certain infectious and parasitic diseases.
Is A56 a billable code?
No — A56 is a non-billable header code. Use a more specific child code (such as A56.0) for billing.
What are the subcodes of A56?
A56 has 6 more specific child codes, including A56.0, A56.1, A56.2.
What is excluded from A56?
Excludes1 (not coded here): neonatal chlamydial conjunctivitis (P39.1); neonatal chlamydial pneumonia (P23.1).

Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.

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