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Z3A

Non-billable

Weeks of gestation

Z3A is the ICD-10-CM code for Weeks of gestation. It is a non-billable category code — use a more specific child code such as Z3A.0 for billing.

Status
Header (non-billable)
Chapter
Z00-Z99
Subcodes
5
Edition
FY2026

Z00-Z99 Factors influencing health status and contact with health services

Code first

Notes

  • •Codes from category Z3A are for use, only on the maternal record, to indicate the weeks of gestation of the pregnancy, if known.

Frequently asked questions

What is ICD-10 code Z3A?
Z3A is the ICD-10-CM code for "Weeks of gestation". It falls under Z00-Z99 Factors influencing health status and contact with health services.
Is Z3A a billable code?
No — Z3A is a non-billable header code. Use a more specific child code (such as Z3A.0) for billing.
What are the subcodes of Z3A?
Z3A has 5 more specific child codes, including Z3A.0, Z3A.1, Z3A.2.

Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.

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