ICD-10 Z3A
Non-Billable HeaderWeeks of gestation
About ICD-10-CM Z3A
ICD-10-CM code Z3A represents Weeks of gestation. This is a non-billable header code in the Factors Influencing Health Status chapter (block Z3A). The 2026 edition of ICD-10-CM Z3A 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.
Coding Notes
Code First
- obstetric condition or encounter for delivery (O09-O60, O80-O82, O94-O9A)
Medicare LCD Coverage for Z3A
Local Coverage Determinations (LCDs) from CMS MACs that list Z3A 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 Z3A.
Our payer policy database covers Aetna, Cigna, Anthem, BCBS, Humana, and Medicare Advantage plans, but Z3A doesn't currently appear in any indexed policy. The code may still be covered under standard plan benefits.
CPT Codes Commonly Billed with Z3A
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 Z3A
Other codes in section Z30-Z39 (Persons encountering health services in circumstances related to reproduction).
ICD-10 Z3A, Billing FAQ
Is ICD-10 code Z3A billable? +
No, Z3A is a non-billable header code. Use a more specific child code from block Z3A when submitting claims.
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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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