A74
⚠ Non-billable (Header)Other diseases caused by chlamydiae
Certain infectious and parasitic diseases (A00-B99)
⚠️ This is a category header code — not billable. Use a more specific child code below.
❌ Excludes1
directThese codes are mutually exclusive. Never code them together.
- • neonatal chlamydial conjunctivitis (P39.1)
- • neonatal chlamydial pneumonia (P23.1)
- • Reiter's disease (M02.3-)
- • sexually transmitted chlamydial diseases (A55-A56)
⚠️ Excludes2
directBoth codes can exist if both conditions are documented.
- • chlamydial pneumonia (J16.0)
Child Codes (3)
Clinical Description
ICD-10-CM code A74 represents other diseases caused by chlamydiae. 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.
Frequently Asked Questions
What is ICD-10 code A74?
ICD-10-CM code A74 is "Other diseases caused by chlamydiae". It belongs to the category: Certain infectious and parasitic diseases (A00-B99).
Is A74 a billable ICD-10 code?
No, A74 is a non-billable header code. A more specific child code must be used for billing.
What codes are excluded with A74?
A74 has 4 Excludes1 rule(s). These codes are mutually exclusive and cannot be coded together on the same claim.
Can A74 be coded with other codes?
A74 has 1 Excludes2 note(s). These conditions can be coded together if both are documented in the patient record.
🧪 Validate Combinations
Add A74 to the Excludes Checker to validate against your full code list.
Open in Checker →Code Information
Data Source
CMS ICD-10-CM 2026 Tabular List
Updated October 1, 2025 (FY2026)