ICD-10-CM > Z00-Z99 > Z30-Z39 > Z3A > Z3A.0 Z3A.0 Weeks of gestation of pregnancy, unspecified or less than 10 weeks Non-Billable/Non-Specific Codes Z3A.00Weeks of gestation of pregnancy not specifiedZ3A.01Less than 8 weeks gestation of pregnancyZ3A.088 weeks gestation of pregnancyZ3A.099 weeks gestation of pregnancy