Z3A – Weeks of gestation
ICD-10-CM 2027 diagnosis code · Persons encountering health services in circumstances related to reproduction
ICD-10-CM code
Z3A
- Code
Z3A(claims format:Z3A)- Description
- Weeks of gestation
- 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
Billable codes under Z3A
Z3A is a header code and cannot be used on claims. Choose the most specific code:
- Z3A.0 – Weeks of gestation of pregnancy, unspecified or less than 10 weeksHeader (more codes below)
- Z3A.1 – Weeks of gestation of pregnancy, weeks 10-19Header (more codes below)
- Z3A.2 – Weeks of gestation of pregnancy, weeks 20-29Header (more codes below)
- Z3A.3 – Weeks of gestation of pregnancy, weeks 30-39Header (more codes below)
- Z3A.4 – Weeks of gestation of pregnancy, weeks 40 or greaterHeader (more codes below)
Notes for Z3A
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, in the block Z30-Z39 (Persons encountering health services in circumstances related to reproduction).
Is Z3A a billable code?
No. Z3A is a header code with more specific child codes; report one of the billable codes listed above.
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.