| Z3A | 
Weeks of gestation | 
| Z3A.0 | 
Weeks of gestation of pregnancy, unspecified or less than 10 weeks | 
| Z3A.00 | 
Weeks of gestation of pregnancy not specified | 
| Z3A.01 | 
Less than 8 weeks gestation of pregnancy | 
| Z3A.08 | 
8 weeks gestation of pregnancy | 
| Z3A.09 | 
9 weeks gestation of pregnancy | 
| Z3A.1 | 
Weeks of gestation of pregnancy, weeks 10-19 | 
| Z3A.10 | 
10 weeks gestation of pregnancy | 
| Z3A.11 | 
11 weeks gestation of pregnancy | 
| Z3A.12 | 
12 weeks gestation of pregnancy | 
| Z3A.13 | 
13 weeks gestation of pregnancy | 
| Z3A.14 | 
14 weeks gestation of pregnancy | 
| Z3A.15 | 
15 weeks gestation of pregnancy | 
| Z3A.16 | 
16 weeks gestation of pregnancy | 
| Z3A.17 | 
17 weeks gestation of pregnancy | 
| Z3A.18 | 
18 weeks gestation of pregnancy | 
| Z3A.19 | 
19 weeks gestation of pregnancy | 
| Z3A.2 | 
Weeks of gestation of pregnancy, weeks 20-29 | 
| Z3A.20 | 
20 weeks gestation of pregnancy | 
| Z3A.21 | 
21 weeks gestation of pregnancy | 
| Z3A.22 | 
22 weeks gestation of pregnancy | 
| Z3A.23 | 
23 weeks gestation of pregnancy | 
| Z3A.24 | 
24 weeks gestation of pregnancy | 
| Z3A.25 | 
25 weeks gestation of pregnancy | 
| Z3A.27 | 
27 weeks gestation of pregnancy | 
| Z3A.28 | 
28 weeks gestation of pregnancy | 
| Z3A.29 | 
29 weeks gestation of pregnancy | 
| Z3A.3 | 
Weeks of gestation of pregnancy, weeks 30-39 | 
| Z3A.30 | 
30 weeks gestation of pregnancy | 
| Z3A.31 | 
31 weeks gestation of pregnancy | 
| Z3A.32 | 
32 weeks gestation of pregnancy | 
| Z3A.33 | 
33 weeks gestation of pregnancy | 
| Z3A.34 | 
34 weeks gestation of pregnancy | 
| Z3A.35 | 
35 weeks gestation of pregnancy | 
| Z3A.36 | 
36 weeks gestation of pregnancy | 
| Z3A.37 | 
37 weeks gestation of pregnancy | 
| Z3A.38 | 
38 weeks gestation of pregnancy | 
| Z3A.39 | 
39 weeks gestation of pregnancy | 
| Z3A.4 | 
Weeks of gestation of pregnancy, weeks 40 or greater | 
| Z3A.40 | 
40 weeks gestation of pregnancy | 
| Z3A.41 | 
41 weeks gestation of pregnancy | 
| Z3A.42 | 
42 weeks gestation of pregnancy | 
| Z3A.49 | 
Greater than 42 weeks gestation of pregnancy |