Emergency: 119
AMDA-IMIC

O11 Pre-existing hypertension with pre-eclampsia

Category / Non-billable header 6 subcodes

Block: Edema, proteinuria and hypertensive disorders in pregnancy, childbirth and the puerperium (O10-O16)

Includes

  • conditions in O10 complicated by pre-eclampsia
  • pre-eclampsia superimposed pre-existing hypertension

Use Additional Code

  • code from O10 to identify the type of hypertension

Subcodes

Subcodes are listed below for reference. Detail pages are not available for chapters 11–22.

Code Description Billable
O11..1 Pre-existing hypertension with pre-eclampsia, first trimester Yes
O11..2 Pre-existing hypertension with pre-eclampsia, second trimester Yes
O11..3 Pre-existing hypertension with pre-eclampsia, third trimester Yes
O11..4 Pre-existing hypertension with pre-eclampsia, complicating childbirth Yes
O11..5 Pre-existing hypertension with pre-eclampsia, complicating the puerperium Yes
O11..9 Pre-existing hypertension with pre-eclampsia, unspecified trimester Yes

Last reviewed: September 2026