VITiếng Việt
ICD-10 Vietnam

O21Excessive vomiting in pregnancy

Code usage status

Primary diagnosis

Select a more specific code

Apply only when it matches the confirmed diagnosis and the documented clinical record.

Specificity

Do not use O21 directly

Use the most specific code supported by the record.

Chapter XV
Pregnancy, childbirth and the puerperium
Group O20-O29
Other maternal disorders predominantly related to pregnancy
Official Vietnamese name
Nôn quá mức trong thai kỳ Nếu muốn, có thể
Additional WHO coding guidance
Use additional code, if desired, to identify cause.

Related O21 codes

O21.0 Primary diagnosis candidate Mild hyperemesis gravidarum O21.1 Primary diagnosis candidate Hyperemesis gravidarum with metabolic disturbance O21.2 Primary diagnosis candidate Late vomiting of pregnancy O21.8 Primary diagnosis candidate Other vomiting complicating pregnancy O21.9 Primary diagnosis candidate Vomiting of pregnancy, unspecified

Clinical record checklist

View coding guide →
  • Confirm that the code matches the final documented diagnosis.
  • Use one primary-diagnosis code and record only relevant additional conditions.
  • Review Ministry indicators, inclusions, exclusions and notes.
  • Do not infer a diagnosis beyond the clinical record.

2026 regulatory basis

Indicators are taken from columns 24–29 of the classification accompanying Circular 06/2026/TT-BYT, cross-referenced with Decision 1849/QĐ-BYT and Official Dispatch 4059/BYT-BH.