O21.9 Vomiting of pregnancy, unspecified

The ICD-10-CM code for Vomiting of pregnancy, unspecified is O21.9 (FY2026). It is a billable, claim-ready diagnosis code.

Classification

Chapter

15: Pregnancy, childbirth and the puerperium (O00-O9A)

Section

O20-O29: Other maternal disorders predominantly related to pregnancy (O20-O29)

Category O21

6 codes (5 billable)

FY2026 Status

Stable since FY2024

Also Known As

ICD-10-CM Alphabetic Index entries that lead to O21.9:

• Pregnancy (single) (uterine) › complicated by (care of) (management affected by) › vomiting

U.S. Hospital Utilization

• An estimated 5,580 U.S. inpatient stays in 2023 included O21.9 among the documented diagnoses.
• 805 stays listed it as the principal diagnosis.

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)