Z3A.0Weeks of gestation of pregnancy, unspecified or less than 10 weeks

Z3A.0 is the ICD-10-CM diagnosis code for weeks of gestation of pregnancy, unspecified or less than 10 weeks. 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, choose Z3A.0 (of pregnancy, unspecified or less than 10 weeks) only when documentation doesn't support a more specific option: of pregnancy, weeks 10-19 (Z3A.1), of pregnancy, weeks 20-29 (Z3A.2), 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.00 (specified), Z3A.01 (pregnancy), Z3A.08 (pregnancy) and Z3A.09 (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.