Z3A.4Weeks of gestation of pregnancy, weeks 40 or greater

Z3A.4 is the ICD-10-CM diagnosis code for weeks of gestation of pregnancy, weeks 40 or greater. It belongs to category Z3A (weeks of gestation), block Z30-Z39 (persons encountering health services in circumstances related to reproduction) and chapter 21 (factors influencing health status and contact with health services). It is a header code, so it can't be reported by itself; one of its 4 subcodes must be used instead.

Within Z3A (weeks of gestation), Z3A.4 is specifically for weeks of gestation of pregnancy, weeks 40 or greater. Related codes cover of pregnancy, unspecified or less than 10 weeks (Z3A.0), of pregnancy, weeks 10-19 (Z3A.1), of pregnancy, weeks 20-29 (Z3A.2) and of pregnancy, weeks 30-39 (Z3A.3).

To report this condition, pick the subcode that matches the documentation: Z3A.40 (pregnancy), Z3A.41 (pregnancy), Z3A.42 (pregnancy) and Z3A.49 (pregnancy).

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

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.