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	✓
O11.2	Pre-existing hypertension with pre-eclampsia, second trimester	✓
O11.3	Pre-existing hypertension with pre-eclampsia, third trimester	✓
O11.4	Pre-existing hypertension with pre-eclampsia, complicating childbirth	✓
O11.5	Pre-existing hypertension with pre-eclampsia, complicating the puerperium	✓
O11.9	Pre-existing hypertension with pre-eclampsia, unspecified trimester	✓

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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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