Z3A.2Weeks of gestation of pregnancy, weeks 20-29

Z3A.2 is the ICD-10-CM diagnosis code for weeks of gestation of pregnancy, weeks 20-29. 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 10 subcodes must be used instead.

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

To report this condition, pick the subcode that matches the documentation: Z3A.20 (pregnancy), Z3A.21 (pregnancy), Z3A.22 (pregnancy), Z3A.23 (pregnancy), Z3A.24 (pregnancy), Z3A.25 (pregnancy), Z3A.26 (pregnancy), Z3A.27 (pregnancy) and 2 more.

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.