ICD-10-CM > Z00-Z99 > Z30-Z39 > Z3A > Z3A.4 Z3A.4 Weeks of gestation of pregnancy, weeks 40 or greater Non-Billable/Non-Specific Codes Z3A.4040 weeks gestation of pregnancyZ3A.4141 weeks gestation of pregnancyZ3A.4242 weeks gestation of pregnancyZ3A.49Greater than 42 weeks gestation of pregnancy