O11.1 – Pre-existing hypertension with pre-eclampsia, first trimester
ICD-10-CM 2027 diagnosis code · Edema, proteinuria and hypertensive disorders in pregnancy, childbirth and the puerperium
- Code
O11.1(claims format:O111)- Description
- Pre-existing hypertension with pre-eclampsia, first trimester
- Short description
- Pre-existing hypertension w pre-eclampsia, first trimester
- Billable
- Yes – valid for HIPAA-covered transactions
- Valid for
- Dates of service October 1, 2026 – September 30, 2027 (FY2027)
- Chapter
- 15. Pregnancy, childbirth and the puerperium (O00-O9A)
- Block
- O10-O16 Edema, proteinuria and hypertensive disorders in pregnancy, childbirth and the puerperium
- Parent codes
- O11
Notes inherited from parent codes
Instructional notes at a category or block level apply to every code below it.
O11 – Pre-existing hypertension with pre-eclampsia
- conditions in O10 complicated by pre-eclampsia
- pre-eclampsia superimposed pre-existing hypertension
- code from O10 to identify the type of hypertension
Related codes in O11
- O11.2 – Pre-existing hypertension with pre-eclampsia, second trimesterBillable
- O11.3 – Pre-existing hypertension with pre-eclampsia, third trimesterBillable
- O11.4 – Pre-existing hypertension with pre-eclampsia, complicating childbirthBillable
- O11.5 – Pre-existing hypertension with pre-eclampsia, complicating the puerperiumBillable
- O11.9 – Pre-existing hypertension with pre-eclampsia, unspecified trimesterBillable
Frequently asked questions
What is ICD-10 code O11.1?
O11.1 is the ICD-10-CM code for pre-existing hypertension with pre-eclampsia, first trimester, in the block O10-O16 (Edema, proteinuria and hypertensive disorders in pregnancy, childbirth and the puerperium).
Is O11.1 a billable code?
Yes. O11.1 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.
What category does O11.1 belong to?
It belongs to category O11 – Pre-existing hypertension with pre-eclampsia.
Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.