Z3A
ICD-10Non-billable categoryWeeks of gestation
Official ICD-10-CM descriptor (FY2026)
Weeks of gestation
Z3A is a category heading, not a billable code. CMS does not accept it on a claim; report one of the more specific codes beneath it.
Code first
Sequence the underlying condition before this code.
- 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.
More specific codes under Z3A
- Z3A.0Weeks of gestation of pregnancy, unsp or less than 10 weekscategory
- Z3A.1Weeks of gestation of pregnancy, weeks 10-19category
- Z3A.2Weeks of gestation of pregnancy, weeks 20-29category
- Z3A.3Weeks of gestation of pregnancy, weeks 30-39category
- Z3A.4Weeks of gestation of pregnancy, weeks 40 or greatercategory
Where this code sits
Krasyn Codes for Chrome
Review coding suggestions beside a validated web workflow. Private pilot.
Request pilot accessSource
ICD-10-CM FY2026. Centers for Medicare & Medicaid Services (CMS) / National Center for Health Statistics (NCHS), “2026 ICD-10-CM Code Descriptions in Tabular Order” (icd10cm_order_2026.txt). Download the original file from cms.gov. Public domain (US Government work). Descriptors, billable flags and instructional notes on this page are reproduced from that file without modification. Krasyn adds no clinical guidance.