| Z3A | Weeks of gestation | NON-BILLABLE CODE |
| Z3A.0 | Weeks of gestation of pregnancy, unspecified or less than 10 weeks | NON-BILLABLE CODE |
| Z3A.00 | Weeks of gestation of pregnancy not specified | BILLABLE CODE |
| Z3A.01 | Less than 8 weeks gestation of pregnancy | BILLABLE CODE |
| Z3A.08 | 8 weeks gestation of pregnancy | BILLABLE CODE |
| Z3A.09 | 9 weeks gestation of pregnancy | BILLABLE CODE |
| Z3A.1 | Weeks of gestation of pregnancy, weeks 10-19 | NON-BILLABLE CODE |
| Z3A.10 | 10 weeks gestation of pregnancy | BILLABLE CODE |
| Z3A.11 | 11 weeks gestation of pregnancy | BILLABLE CODE |
| Z3A.12 | 12 weeks gestation of pregnancy | BILLABLE CODE |
| Z3A.13 | 13 weeks gestation of pregnancy | BILLABLE CODE |
| Z3A.14 | 14 weeks gestation of pregnancy | BILLABLE CODE |
| Z3A.15 | 15 weeks gestation of pregnancy | BILLABLE CODE |
| Z3A.17 | 17 weeks gestation of pregnancy | BILLABLE CODE |
| Z3A.18 | 18 weeks gestation of pregnancy | BILLABLE CODE |
| Z3A.19 | 19 weeks gestation of pregnancy | BILLABLE CODE |
| Z3A.2 | Weeks of gestation of pregnancy, weeks 20-29 | NON-BILLABLE CODE |
| Z3A.20 | 20 weeks gestation of pregnancy | BILLABLE CODE |
| Z3A.21 | 21 weeks gestation of pregnancy | BILLABLE CODE |
| Z3A.22 | 22 weeks gestation of pregnancy | BILLABLE CODE |
| Z3A.23 | 23 weeks gestation of pregnancy | BILLABLE CODE |
| Z3A.24 | 24 weeks gestation of pregnancy | BILLABLE CODE |
| Z3A.25 | 25 weeks gestation of pregnancy | BILLABLE CODE |
| Z3A.26 | 26 weeks gestation of pregnancy | BILLABLE CODE |
| Z3A.27 | 27 weeks gestation of pregnancy | BILLABLE CODE |
| Z3A.28 | 28 weeks gestation of pregnancy | BILLABLE CODE |
| Z3A.29 | 29 weeks gestation of pregnancy | BILLABLE CODE |
| Z3A.3 | Weeks of gestation of pregnancy, weeks 30-39 | NON-BILLABLE CODE |
| Z3A.30 | 30 weeks gestation of pregnancy | BILLABLE CODE |
| Z3A.31 | 31 weeks gestation of pregnancy | BILLABLE CODE |
| Z3A.32 | 32 weeks gestation of pregnancy | BILLABLE CODE |
| Z3A.33 | 33 weeks gestation of pregnancy | BILLABLE CODE |
| Z3A.34 | 34 weeks gestation of pregnancy | BILLABLE CODE |
| Z3A.35 | 35 weeks gestation of pregnancy | BILLABLE CODE |
| Z3A.36 | 36 weeks gestation of pregnancy | BILLABLE CODE |
| Z3A.37 | 37 weeks gestation of pregnancy | BILLABLE CODE |
| Z3A.38 | 38 weeks gestation of pregnancy | BILLABLE CODE |
| Z3A.39 | 39 weeks gestation of pregnancy | BILLABLE CODE |
| Z3A.4 | Weeks of gestation of pregnancy, weeks 40 or greater | NON-BILLABLE CODE |
| Z3A.40 | 40 weeks gestation of pregnancy | BILLABLE CODE |
| Z3A.41 | 41 weeks gestation of pregnancy | BILLABLE CODE |
| Z3A.42 | 42 weeks gestation of pregnancy | BILLABLE CODE |
| Z3A.49 | Greater than 42 weeks gestation of pregnancy | BILLABLE CODE |
