Z3A
⚠ Non-billable
Weeks of gestation
ICD-10-CM · FY2026 · Factors Influencing Health Status
Code
Z3A
System
ICD-10-CM
Billable
No — use specific code
Effective
FY2026
Chapter
Factors Influencing Health Status
Source
CMS / CDC NCHS
⚠ Verify before billing. Confirm against the current CMS/NCHS ICD-10-CM files and your payer's rules before claims submission.
Frequently asked questions
What is ICD-10 code Z3A?
ICD-10-CM code Z3A represents Weeks of gestation. It is a non-billable header code requiring a more specific subcategory in the Factors Influencing Health Status chapter, effective October 1, 2025 – September 30, 2026.
Is Z3A billable?
No. Z3A is a non-billable header. Select a more specific subcategory for claims submission.
What chapter is Z3A in?
Z3A belongs to the Factors Influencing Health Status chapter (Z00–Z99) of ICD-10-CM.
Related codes in the Z3A category
Z3A.0
Weeks of gestation of pregnancy, unspecified or less than 10 weeks
Non-billable
Z3A.1
Weeks of gestation of pregnancy, weeks 10-19
Non-billable
Z3A.2
Weeks of gestation of pregnancy, weeks 20-29
Non-billable
Z3A.3
Weeks of gestation of pregnancy, weeks 30-39
Non-billable
Z3A.4
Weeks of gestation of pregnancy, weeks 40 or greater
Non-billable
Z3A.00
Weeks of gestation of pregnancy not specified
Billable
Z3A.01
Less than 8 weeks gestation of pregnancy
Billable
Z3A.08
8 weeks gestation of pregnancy
Billable
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