Is ICD-10-CM code Z3A billable?

No, Z3A (Weeks of gestation) is a non-billable ICD-10-CM code. It must be coded to a more specific subcategory before it can be used for reimbursement.

What chapter does ICD-10-CM code Z3A belong to?

Z3A belongs to Chapter 21 of the ICD-10-CM tabular list: Z00–Z99 (Factors Influencing Health Status and Contact with Health Services).

Z3ANot billable, use a more specific code below

Weeks of gestation

In Persons encountering health services in circumstances related to reproduction (Z30-Z39), chapter 21: Factors Influencing Health Status and Contact with Health Services

38 billable codes under Z3A: none are a CC or MCC; none map to an HCC.

Instructional notes

Code first: code the underlying condition first, then this code

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

Official coding guidelines

From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.

Covers when and how to use Z codes (Z00-Z99) for encounters and supplementary information, including contact, status, history, screening, aftercare, exams, and social determinants of health.

Use of Z Codes in Any Healthcare Setting (page 92)
Z Codes Indicate a Reason for an Encounter or Provide Additional Information about a Patient Encounter (page 93)
Categories of Z Codes (page 93)

Read Section I.C.21 (page 92)

All codes under Z3A

Z3A can't be used on a claim. Pick a billable code below; grey headings group them.

Z3A MS-DRG

As the principal diagnosis, all 38 billable codes under Z3A group to MS-DRG 951 (v44.0).

DRG 951 Other Factors Influencing Health Status

Other codes that refer to Z3A

Notes on these codes point to Z3A.

CH15 Use Additional Code: code, if applicable, from category Z3A, Weeks of gestation, to identify the specific week of the pregnancy, if known.

About the condition

Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.

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:

Code history

Valid since FY2016, when ICD-10-CM took effect on October 1, 2015. No changes since.