Z3A.33 33 weeks gestation of pregnancy

The ICD-10-CM code for 33 weeks gestation of pregnancy is Z3A.33 (FY2026). It is a billable, claim-ready diagnosis code.

Classification

Chapter

21: Factors influencing health status and contact with health services (Z00-Z99)

Section

Z30-Z39: Persons encountering health services in circumstances related to reproduction (Z30-Z39)

Category Z3A

44 codes (38 billable)

FY2026 Status

Stable since FY2024

Also Known As

ICD-10-CM Alphabetic Index entries that lead to Z3A.33:

• Pregnancy (single) (uterine) › weeks of gestation › 33 weeks

U.S. Hospital Utilization

• An estimated 35,545 U.S. inpatient stays in 2023 included Z3A.33 among the documented diagnoses.

Source: National Inpatient Sample (NIS), Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality, 2016–2023. National survey-weighted estimates.

References

• CMS — ICD-10-CM Official Code Set and Guidelines, FY2026
• CDC/NCHS — ICD-10-CM Files and Browser Tool
• AHRQ — HCUP National Inpatient Sample, Frequencies by Diagnosis Code (2016–2023)