Z3A.00 ICD-10-CM Code: Weeks of gestation of pregnancy not specified
Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.
Inpatient Payment Groups (MS-DRG)
MS-DRGs this diagnosis helps define, as principal or secondary, per the CMS ICD-10-CM/PCS MS-DRG Definitions Manual v43.0 (FY2026), Appendix B.
- MS-DRG 951 — OTHER FACTORS INFLUENCING HEALTH STATUS (MDC 23)
A diagnosis appearing in a group's logic does not by itself determine the DRG assigned to a stay; the grouper uses the full claim.
Code Set: Valid FY2026 and FY2027. FY2026 took effect October 1, 2025.
Official Registry Overview & Definition
Official Tabular Instructional Notes
Sequencing, inclusion, and exclusion notes published for Z3A.00 in the official ICD-10-CM tabular list.
Code First
Underlying conditions that must be sequenced before this code.
- obstetric condition or encounter for delivery (O09-O60, O80-O82, O94-O9A)
Nearest Codes in This Family
Official ICD-10-CM classifications closest to Z3A.00 in its code family, with their registry titles.
- Z3A — Weeks of gestation
- Z3A.0 — Weeks of gestation of pregnancy, unspecified or less than 10 weeks
- 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
Indexed Clinical Terms (1)
Clinical term phrases from the official ICD-10-CM Index to Diseases and Injuries that map to this code.
- Pregnancy (single) (uterine), weeks of gestation, not specified