A56.0

⚠ Non-billable (Header)

Chlamydial infection of lower genitourinary tract

Certain infectious and parasitic diseases (A00-B99)

⚠️ This is a category header code — not billable. Use a more specific child code below.

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❌ Excludes1

inherited

Rules inherited from parent codes in the hierarchy.

A56

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

⚠️ Excludes2

inherited

Rules inherited from parent codes.

A56

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

Child Codes (4)

A56.00Chlamydial infection of lower genitourinary tract, unspecified✓ Billable A56.01Chlamydial cystitis and urethritis✓ Billable A56.02Chlamydial vulvovaginitis✓ Billable A56.09Other chlamydial infection of lower genitourinary tract✓ Billable

Clinical Description

ICD-10-CM code A56.0 represents chlamydial infection of lower genitourinary tract. This code falls under the Certain infectious and parasitic diseases (A00-B99) classification. It is a non-billable category header code. A more specific child code from the list below must be used for billing and reimbursement purposes.

This is a 5-character code at the 4th level of specificity. There are 4 more specific child codes under A56.0. Coders should note that A56.0 has 2 Excludes1 restriction(s) — codes that cannot be reported together on the same claim.

Frequently Asked Questions

What is ICD-10 code A56.0?

ICD-10-CM code A56.0 is "Chlamydial infection of lower genitourinary tract". It belongs to the category: Certain infectious and parasitic diseases (A00-B99).

Is A56.0 a billable ICD-10 code?

No, A56.0 is a non-billable header code. A more specific child code must be used for billing.

What codes are excluded with A56.0?

A56.0 has 2 Excludes1 rule(s). These codes are mutually exclusive and cannot be coded together on the same claim.

Can A56.0 be coded with other codes?

A56.0 has 2 Excludes2 note(s). These conditions can be coded together if both are documented in the patient record.

Related Codes in A56

Other codes in the same category that may be relevant for differential coding:

A56.1Chlamydial infection of pelviperitoneum and other genitourinary organs A56.2Chlamydial infection of genitourinary tract, unspecified A56.3Chlamydial infection of anus and rectum A56.4Chlamydial infection of pharynx A56.8Sexually transmitted chlamydial infection of other sites

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Code Information

CodeA56.0

BillableNo — Header code

ParentA56

CategoryCertain infectious and parasitic diseases (A00-B99)

Excludes12 rule(s)

Excludes22 note(s)

Child codes4

Data Source

CMS ICD-10-CM 2026 Tabular List

Updated October 1, 2025 (FY2026)