Z3A

Header — not billable

Weeks of gestation

The ICD-10 code for weeks of gestation is Z3A.

Z3A is a non-billable header code. It groups related conditions but cannot be used on its own for reimbursement — select one of the 5 more specific codes below.

Clinical notes

Code first

This code represents a manifestation of an underlying disease. Coding convention requires the underlying (etiology) code to be sequenced first, with this code listed second.

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

Documentation support

General coding-documentation guidance — not a substitute for payer-specific requirements or professional coding judgment.

•This is a non-billable header code. Documentation must support a more specific child code before this diagnosis can be reported on a claim.
•This code represents a manifestation. Documentation should identify the underlying condition, which must be coded first.
•As a general rule, code to the highest level of specificity supported by the documentation in the medical record.

Z3A

Clinical notes

Code first

Documentation support

Child codes under Z3A

Related codes in this category