ICD-10-CM · Chapter 21 · Z00-Z99
Z3A Weeks of gestation
Notes
- Codes from category Z3A are for use, only on the maternal record, to indicate the weeks of gestation of the pregnancy, if known.
Code First
- obstetric condition or encounter for delivery (O09-O60, O80-O82, O94-O9A)
Subcodes
Subcodes are listed below for reference. Detail pages are not available for chapters 11–22.
| Code | Description | Billable |
|---|---|---|
| Z3A..0 | Weeks of gestation of pregnancy, unspecified or less than 10 weeks | No |
| Z3A..00 | Weeks of gestation of pregnancy not specified | Yes |
| Z3A..01 | Less than 8 weeks gestation of pregnancy | Yes |
| Z3A..08 | 8 weeks gestation of pregnancy | Yes |
| Z3A..09 | 9 weeks gestation of pregnancy | Yes |
| Z3A..1 | Weeks of gestation of pregnancy, weeks 10-19 | No |
| Z3A..10 | 10 weeks gestation of pregnancy | Yes |
| Z3A..11 | 11 weeks gestation of pregnancy | Yes |
| Z3A..12 | 12 weeks gestation of pregnancy | Yes |
| Z3A..13 | 13 weeks gestation of pregnancy | Yes |
| Z3A..14 | 14 weeks gestation of pregnancy | Yes |
| Z3A..15 | 15 weeks gestation of pregnancy | Yes |
| Z3A..16 | 16 weeks gestation of pregnancy | Yes |
| Z3A..17 | 17 weeks gestation of pregnancy | Yes |
| Z3A..18 | 18 weeks gestation of pregnancy | Yes |
| Z3A..19 | 19 weeks gestation of pregnancy | Yes |
| Z3A..2 | Weeks of gestation of pregnancy, weeks 20-29 | No |
| Z3A..20 | 20 weeks gestation of pregnancy | Yes |
| Z3A..21 | 21 weeks gestation of pregnancy | Yes |
| Z3A..22 | 22 weeks gestation of pregnancy | Yes |
| Z3A..23 | 23 weeks gestation of pregnancy | Yes |
| Z3A..24 | 24 weeks gestation of pregnancy | Yes |
| Z3A..25 | 25 weeks gestation of pregnancy | Yes |
| Z3A..26 | 26 weeks gestation of pregnancy | Yes |
| Z3A..27 | 27 weeks gestation of pregnancy | Yes |
| Z3A..28 | 28 weeks gestation of pregnancy | Yes |
| Z3A..29 | 29 weeks gestation of pregnancy | Yes |
| Z3A..3 | Weeks of gestation of pregnancy, weeks 30-39 | No |
| Z3A..30 | 30 weeks gestation of pregnancy | Yes |
| Z3A..31 | 31 weeks gestation of pregnancy | Yes |
| Z3A..32 | 32 weeks gestation of pregnancy | Yes |
| Z3A..33 | 33 weeks gestation of pregnancy | Yes |
| Z3A..34 | 34 weeks gestation of pregnancy | Yes |
| Z3A..35 | 35 weeks gestation of pregnancy | Yes |
| Z3A..36 | 36 weeks gestation of pregnancy | Yes |
| Z3A..37 | 37 weeks gestation of pregnancy | Yes |
| Z3A..38 | 38 weeks gestation of pregnancy | Yes |
| Z3A..39 | 39 weeks gestation of pregnancy | Yes |
| Z3A..4 | Weeks of gestation of pregnancy, weeks 40 or greater | No |
| Z3A..40 | 40 weeks gestation of pregnancy | Yes |
| Z3A..41 | 41 weeks gestation of pregnancy | Yes |
| Z3A..42 | 42 weeks gestation of pregnancy | Yes |
| Z3A..49 | Greater than 42 weeks gestation of pregnancy | Yes |
Related pages
Last reviewed: September 2026