| ICD Code | Description |
|---|---|
| O100 | Pre-existing essential hypertension complicating pregnancy, childbirth and the puerperium |
| O101 | Pre-existing hypertensive heart disease complicating pregnancy, childbirth and the puerperium |
| O102 | Pre-existing hypertensive chronic kidney disease complicating pregnancy, childbirth and the puerperium |
| O103 | Pre-existing hypertensive heart and chronic kidney disease complicating pregnancy, childbirth and the puerperium |
| O104 | Pre-existing secondary hypertension complicating pregnancy, childbirth and the puerperium |
| O109 | Unspecified pre-existing hypertension complicating pregnancy, childbirth and the puerperium |