Z3A.1 – Weeks of gestation of pregnancy, weeks 10-19

ICD-10-CM 2027 diagnosis code · Persons encountering health services in circumstances related to reproduction

Non-billable header

ICD-10-CM code Z3A.1

Code: Z3A.1 (claims format: Z3A1)
Description: Weeks of gestation of pregnancy, weeks 10-19
Billable: No – use a more specific code below
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 21. Factors influencing health status and contact with health services (Z00-Z99)
Block: Z30-Z39 Persons encountering health services in circumstances related to reproduction
Parent codes: Z3A

Billable codes under Z3A.1

Z3A.1 is a header code and cannot be used on claims. Choose the most specific code:

Z3A.10 – 10 weeks gestation of pregnancyBillable
Z3A.11 – 11 weeks gestation of pregnancyBillable
Z3A.12 – 12 weeks gestation of pregnancyBillable
Z3A.13 – 13 weeks gestation of pregnancyBillable
Z3A.14 – 14 weeks gestation of pregnancyBillable
Z3A.15 – 15 weeks gestation of pregnancyBillable
Z3A.16 – 16 weeks gestation of pregnancyBillable
Z3A.17 – 17 weeks gestation of pregnancyBillable
Z3A.18 – 18 weeks gestation of pregnancyBillable
Z3A.19 – 19 weeks gestation of pregnancyBillable

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

Z3A – Weeks of gestation

Code first:

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

Notes:

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

Related codes in Z3A

Frequently asked questions

What is ICD-10 code Z3A.1?

Z3A.1 is the ICD-10-CM code for weeks of gestation of pregnancy, weeks 10-19, in the block Z30-Z39 (Persons encountering health services in circumstances related to reproduction).

Is Z3A.1 a billable code?

No. Z3A.1 is a header code with more specific child codes; report one of the billable codes listed above.

What category does Z3A.1 belong to?

It belongs to category Z3A – Weeks of gestation.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.