O21: Excessive vomiting in pregnancy
Codes under O21 (Excessive vomiting in pregnancy). A ✓ marks a billable (fully specified) code; category codes without a ✓ are not billable on their own.
| Code | Description | Billable |
|---|---|---|
| O21.0 | Mild hyperemesis gravidarum | ✓ |
| O21.0 | Mild hyperemesis gravidarum | ✓ |
| O21.1 | Hyperemesis gravidarum with metabolic disturbance | ✓ |
| O21.1 | Hyperemesis gravidarum with metabolic disturbance | ✓ |
| O21.2 | Late vomiting of pregnancy | ✓ |
| O21.2 | Late vomiting of pregnancy | ✓ |
| O21.8 | Other vomiting complicating pregnancy | ✓ |
| O21.8 | Other vomiting complicating pregnancy | ✓ |
| O21.9 | Vomiting of pregnancy, unspecified | ✓ |
| O21.9 | Vomiting of pregnancy, unspecified | ✓ |
Frequently asked questions
What is ICD-10-CM code O21?
O21 is an ICD-10-CM category covering Excessive vomiting in pregnancy. It contains 10 more specific diagnosis codes, 10 of which are billable.
Is O21 a billable code?
No — O21 is a category header and isn't billable on its own. Code to the highest level of specificity using one of its subcodes (for example O21.0 — Mild hyperemesis gravidarum). 10 of the 10 codes under O21 are billable.
What codes fall under O21?
O21 includes O21.0, O21.0, O21.1, O21.1, O21.2, plus 5 more. See the full list with descriptions and billable status above.
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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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