2026 ICD-10-CM Diagnosis Code Z3A.3838 weeks gestation of pregnancy

ICD-10-CM Codes›Z00–Z99›Z30-Z39›Z3A

ICD-10-CM Z3A.38
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

Z3A.38 is a billable ICD-10-CM diagnosis code for 38 weeks gestation of pregnancy. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). The code is restricted by the Medicare Code Editor to maternity cases (age 9 through 64), not accepted as a principal diagnosis, and exempt from POA reporting. Coders also document this condition as gestation period, 38 weeks. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Gestational weeks.

Code Identity

ICD-10-CM Code
Z3A.38
Billable Status
Yes — Valid for Submission
Code Describes
38 weeks gestation of pregnancy
Short Description
38 weeks gestation of pregnancy
Same as the full description in the CMS dataset.
Parent Code
Z3A.3
Weeks of gestation of pregnancy, weeks 30-39

Code Classification

ChapterZ00–Z99Factors influencing health status and contact with health services
SectionZ30-Z39Persons encountering health services in circumstances related to reproduction
CategoryZ3AWeeks of gestation
This CodeZ3A.3838 weeks gestation of pregnancy

Code EditsBilling

Medicare Code Editor checks that affect claim validity for Z3A.38.

Maternity diagnoses
The Medicare Code Editor detects inconsistencies in maternity cases by checking a patient's age and any diagnosis on the patient's record. The maternity code edits apply to patients age ange is 9–64 years inclusive (e.g., diabetes in pregnancy, antepartum pulmonary complication).
Unacceptable principal diagnosis
There are selected codes that describe a circumstance which influences an individual's health status but not a current illness or injury, or codes that are not specific manifestations but may be due to an underlying cause. These codes are considered unacceptable as a principal diagnosis.

Present on Admission (POA)Billing

Z3A.38 is exempt from POA reporting on inpatient claims to general acute care hospitals. Review other POA exempt codes.

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Gestation period, 38 weeks

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Pregnancy(single) (uterine)
      • weeks of gestation
        • 38 weeks

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR PRG002
Gestational weeks
Default principal diagnosis: inpatient No · outpatient Yes

Patient EducationClinical

Pregnancy

You're going to have a baby! It's an exciting time, but it can also feel a bit overwhelming. You may have a lot of questions, including what you can do to give your baby a healthy start. Taking care of your health while you're pregnant will help your fetus develop into a healthy baby. To do that, it's important to:

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert Z3A.38 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
No Map There is no ICD-9 equivalent for this code.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About Z3A.38Overview

Is Z3A.38 (Weeks of gestation of pregnancy, weeks 30-39) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report 38 weeks gestation of pregnancy on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

Can Z3A.38 be a principal diagnosis?

No. The Medicare Code Editor rejects this code as a principal diagnosis because 38 weeks gestation of pregnancy describes a circumstance that influences health status rather than a current illness. Report it as a secondary diagnosis.

Who can Z3A.38 be reported for?

The Medicare Code Editor checks 38 weeks gestation of pregnancy against patient demographics: this code is intended for maternity cases (age 9 through 64). Claims outside these limits are flagged as inconsistent.

Is Z3A.38 exempt from POA reporting?

Yes. CMS lists this code among those exempt from present on admission reporting, so hospitals do not assign a POA indicator for 38 weeks gestation of pregnancy on inpatient claims.