Alphabetic Index FY2027

Z3A

Weeks of gestation

FY2027Chapter 21: Factors influencing health status and contact with health services/Z30–Z39 Persons encountering health services in circumstances related to reproduction

Non-billable headerNot valid on its own. Use one of the more specific codes under it.

Z3A is a non-billable ICD-10-CM code category for weeks of gestation. Report a more specific code from it instead. It is part of the FY2027 code set, effective October 1, 2026. The more specific codes under it are Z3A.0 Weeks of gestation of pregnancy, unspecified or less than 10 weeks; Z3A.1 Weeks of gestation of pregnancy, weeks 10-19; Z3A.2 Weeks of gestation of pregnancy, weeks 20-29; Z3A.3 Weeks of gestation of pregnancy, weeks 30-39 and 1 more. Its coding notes include a Code first instruction.

Code first

If the underlying condition listed here is present and known, sequence it first.

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

Notes

This code
  • Codes from category Z3A are for use, only on the maternal record, to indicate the weeks of gestation of the pregnancy, if known.
Also from chapter/block level (3 notes)
Inherited from Chapter 21 Factors influencing health status and contact with health services
  • Z codes represent reasons for encounters. A corresponding procedure code must accompany a Z code if a procedure is performed. Categories Z00-Z99 are provided for occasions when circumstances other than a disease, injury or external cause classifiable to categories A00-Y89 are recorded as 'diagnoses' or 'problems'. This can arise in two main ways:
    • (a) When a person who may or may not be sick encounters the health services for some specific purpose, such as to receive limited care or service for a current condition, to donate an organ or tissue, to receive prophylactic vaccination (immunization), or to discuss a problem which is in itself not a disease or injury.
    • (b) When some circumstance or problem is present which influences the person's health status but is not in itself a current illness or injury.

More specific codes under Z3A 5