O11: Pre-existing hypertension with pre-eclampsia
Codes under O11 (Pre-existing hypertension with pre-eclampsia). A ✓ marks a billable (fully specified) code; category codes without a ✓ are not billable on their own.
| Code | Description | Billable |
|---|---|---|
| O11.1 | Pre-existing hypertension with pre-eclampsia, first trimester | ✓ |
| O11.1 | Pre-existing hypertension with pre-eclampsia, first trimester | ✓ |
| O11.2 | Pre-existing hypertension with pre-eclampsia, second trimester | ✓ |
| O11.2 | Pre-existing hypertension with pre-eclampsia, second trimester | ✓ |
| O11.3 | Pre-existing hypertension with pre-eclampsia, third trimester | ✓ |
| O11.3 | Pre-existing hypertension with pre-eclampsia, third trimester | ✓ |
| O11.4 | Pre-existing hypertension with pre-eclampsia, complicating childbirth | ✓ |
| O11.4 | Pre-existing hypertension with pre-eclampsia, complicating childbirth | ✓ |
| O11.5 | Pre-existing hypertension with pre-eclampsia, complicating the puerperium | ✓ |
| O11.5 | Pre-existing hypertension with pre-eclampsia, complicating the puerperium | ✓ |
| O11.9 | Pre-existing hypertension with pre-eclampsia, unspecified trimester | ✓ |
| O11.9 | Pre-existing hypertension with pre-eclampsia, unspecified trimester | ✓ |
Frequently asked questions
What is ICD-10-CM code O11?
O11 is an ICD-10-CM category covering Pre-existing hypertension with pre-eclampsia. It contains 12 more specific diagnosis codes, 12 of which are billable.
Is O11 a billable code?
No — O11 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 O11.1 — Pre-existing hypertension with pre-eclampsia, first trimester). 12 of the 12 codes under O11 are billable.
What codes fall under O11?
O11 includes O11.1, O11.1, O11.2, O11.2, O11.3, plus 7 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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