---
title: "ICD-10-CM Z3A.01: Less than 8 weeks gestation of pregnancy | BillingBrief"
description: "ICD-10-CM code Z3A.01: Less than 8 weeks gestation of pregnancy. Category, related codes, and the official source, in plain English."
canonical: "https://billingbrief.com/icd10/z3a.01/"
language: "en"
---

# Z3A.01 Less than 8 weeks gestation of pregnancy

ICD-10-CM · [CMS code reference](#source)

**Official ICD-10-CM description:** Less than 8 weeks gestation of pregnancy

## Coding notes

From the ICD-10-CM FY2027 (effective October 1, 2026) tabular list. Notes on a parent code or category apply here too.

### Note

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

### Code first

Code the underlying condition first, then this code.

-   obstetric condition or encounter for delivery (O09-O60, O80-O82, O94-O9A)

## Related codes

-   [`Z3A.00` Weeks of gestation of pregnancy not specified ICD-10-CM](https://billingbrief.com/icd10/z3a.00/)
-   [`Z3A.08` 8 weeks gestation of pregnancy ICD-10-CM](https://billingbrief.com/icd10/z3a.08/)
-   [`Z3A.09` 9 weeks gestation of pregnancy ICD-10-CM](https://billingbrief.com/icd10/z3a.09/)
-   [`Z3A.10` 10 weeks gestation of pregnancy ICD-10-CM](https://billingbrief.com/icd10/z3a.10/)
-   [`Z3A.11` 11 weeks gestation of pregnancy ICD-10-CM](https://billingbrief.com/icd10/z3a.11/)
-   [`Z3A.12` 12 weeks gestation of pregnancy ICD-10-CM](https://billingbrief.com/icd10/z3a.12/)
-   [`Z3A.13` 13 weeks gestation of pregnancy ICD-10-CM](https://billingbrief.com/icd10/z3a.13/)
-   [`Z3A.14` 14 weeks gestation of pregnancy ICD-10-CM](https://billingbrief.com/icd10/z3a.14/)

## Common questions

### Is Z3A.01 a billable code?

Yes. Z3A.01 is a billable ICD-10-CM code in the ICD-10-CM FY2027 (effective October 1, 2026) code set.

## From the source

Official description from [CMS](https://www.cms.gov/medicare/coding-billing/icd-10-codes).
ICD-10-CM FY2027 (effective October 1, 2026).

Code set

ICD-10-CM

Category

Z3A Weeks of gestation

Chapter

Factors influencing health status and contact with health services

Billable

Yes

Educational reference only. Not medical, legal, or billing advice. Always check the current official code set and payer policy before you bill. [About BillingBrief and our sources](https://billingbrief.com/about/).