ICD-10 A74
Non-Billable HeaderOther diseases caused by chlamydiae
About ICD-10-CM A74
ICD-10-CM code A74 represents Other diseases caused by chlamydiae. This is a non-billable header code in the Infectious and Parasitic Diseases chapter (block A74). The 2026 edition of ICD-10-CM A74 became effective on October 1, 2025. Non-billable codes cannot be used as a primary or secondary diagnosis on a claim, use a more specific child code instead.
Type 1 Excludes
Pure excludes, these codes can never be coded together with A74. The conditions are mutually exclusive (e.g., congenital vs acquired forms).
- neonatal chlamydial conjunctivitis (P39.1)
- neonatal chlamydial pneumonia (P23.1)
- Reiter's disease (M02.3-)
- sexually transmitted chlamydial diseases (A55-A56)
Type 2 Excludes
Not included here, the excluded code is not part of A74, but a patient may have both conditions at the same time. Both codes may be coded together when applicable.
- chlamydial pneumonia (J16.0)
Medicare LCD Coverage for A74
Local Coverage Determinations (LCDs) from CMS MACs that list A74 as a covered diagnosis.
This doesn't mean the code isn't covered, it means no MAC has issued a Local Coverage Determination naming this specific code. Coverage may still apply under National Coverage Determinations or general medical-necessity rules.
Commercial Payer Coverage
Coverage policies from major commercial payers referencing A74.
Our payer policy database covers Aetna, Cigna, Anthem, BCBS, Humana, and Medicare Advantage plans, but A74 doesn't currently appear in any indexed policy. The code may still be covered under standard plan benefits.
CPT Codes Commonly Billed with A74
Procedures frequently paired with this diagnosis based on PayerReady's Dx↔Px linkage data.
We don't have CPT pairings indexed for this specific code yet. Use the CPT search above to find common procedures, or check your payer's published medical policy for code-specific guidance.
Codes Adjacent To A74
Other codes in section A70-A74 (Other diseases caused by chlamydiae).
ICD-10 A74, Billing FAQ
Is ICD-10 code A74 billable? +
No, A74 is a non-billable header code. Use a more specific child code from block A74 when submitting claims.
What codes are Type 1 Excludes for A74? +
Type 1 Excludes (never code together with A74): neonatal chlamydial conjunctivitis (P39.1); neonatal chlamydial pneumonia (P23.1); Reiter's disease (M02.3-)
What codes are Type 2 Excludes for A74? +
Type 2 Excludes (may be coded together when both conditions exist): chlamydial pneumonia (J16.0)
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Reviewed by the PayerReady Medical Coding Team
Verified against the CMS 2026 code set on June 1, 2026.
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