Z3A: Weeks of gestation

Codes under Z3A (Weeks of gestation). A ✓ marks a billable (fully specified) code; category codes without a ✓ are not billable on their own.

Code	Description	Billable
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.1	Weeks of gestation of pregnancy, weeks 10-19	—
Z3A.2	Weeks of gestation of pregnancy, weeks 20-29	—
Z3A.3	Weeks of gestation of pregnancy, weeks 30-39	—
Z3A.4	Weeks of gestation of pregnancy, weeks 40 or greater	—
Z3A.08	8 weeks gestation of pregnancy	✓
Z3A.09	9 weeks gestation of pregnancy	✓
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.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.26	26 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.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.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	✓

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Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.

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