O21 is the ICD-10 code for Excessive vomiting in pregnancy. It is a three-character category divided into 5 subcodes; use the subcode whenever the record supports that level of detail. It belongs to the block O20–O29 (Other maternal disorders predominantly related to pregnancy) in Chapter XV, Pregnancy, childbirth and the puerperium.
- Code type
- Category (3 characters)
- Chapter
- XV · O00–O99
- Classification
- WHO ICD-10, 2019 version
Coding notes
- Use additional code, if desired, to identify cause.
Subcodes of O21
O21 in national editions
Countries report with their own edition of ICD-10. Most keep the WHO code and add more specific codes beneath it.
DO21Opkastninger i graviditeten
O21Raskausoksentelu
O21Übermäßiges Erbrechen während der Schwangerschaft
O21Vomissements incoercibles au cours de la grossesse
O21overvloedig zwangerschapsbraken
Based on the World Health Organization’s International Statistical Classification of Diseases and Related Health Problems, 10th revision (ICD-10), 2019 version, and the national editions published by each country’s health authority. This page is a reference, not coding advice; follow your national coding rules when you report.
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