ICD-10 A56
Non-Billable HeaderOther sexually transmitted chlamydial diseases
About ICD-10-CM A56
ICD-10-CM code A56 represents Other sexually transmitted chlamydial diseases. This is a non-billable header code in the Infectious and Parasitic Diseases chapter (block A56). The 2026 edition of ICD-10-CM A56 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 A56. The conditions are mutually exclusive (e.g., congenital vs acquired forms).
- neonatal chlamydial conjunctivitis (P39.1)
- neonatal chlamydial pneumonia (P23.1)
Type 2 Excludes
Not included here, the excluded code is not part of A56, but a patient may have both conditions at the same time. Both codes may be coded together when applicable.
- chlamydial lymphogranuloma (A55)
- conditions classified to A74.-
Includes
- sexually transmitted diseases due to Chlamydia
- trachomatis
Medicare LCD Coverage for A56
Local Coverage Determinations (LCDs) from CMS MACs that list A56 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 A56.
Our payer policy database covers Aetna, Cigna, Anthem, BCBS, Humana, and Medicare Advantage plans, but A56 doesn't currently appear in any indexed policy. The code may still be covered under standard plan benefits.
CPT Codes Commonly Billed with A56
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 A56
Other codes in section A50-A64 (Infections with a predominantly sexual mode of transmission).
ICD-10 A56, Billing FAQ
Is ICD-10 code A56 billable? +
No, A56 is a non-billable header code. Use a more specific child code from block A56 when submitting claims.
What codes are Type 1 Excludes for A56? +
Type 1 Excludes (never code together with A56): neonatal chlamydial conjunctivitis (P39.1); neonatal chlamydial pneumonia (P23.1)
What codes are Type 2 Excludes for A56? +
Type 2 Excludes (may be coded together when both conditions exist): chlamydial lymphogranuloma (A55); conditions classified to A74.-
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Reviewed by the PayerReady Medical Coding Team
Verified against the CMS 2026 code set on May 31, 2026.
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