O10.91 – Unspecified pre-existing hypertension complicating pregnancy
ICD-10-CM 2027 diagnosis code · Edema, proteinuria and hypertensive disorders in pregnancy, childbirth and the puerperium
- Code
O10.91(claims format:O1091)- Description
- Unspecified pre-existing hypertension complicating pregnancy
- Billable
- No – use a more specific code below
- 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
- O10 › O10.9
Billable codes under O10.91
O10.91 is a header code and cannot be used on claims. Choose the most specific code:
- O10.911 – Unspecified pre-existing hypertension complicating pregnancy, first trimesterBillable
- O10.912 – Unspecified pre-existing hypertension complicating pregnancy, second trimesterBillable
- O10.913 – Unspecified pre-existing hypertension complicating pregnancy, third trimesterBillable
- O10.919 – Unspecified pre-existing hypertension complicating pregnancy, unspecified trimesterBillable
Notes inherited from parent codes
Instructional notes at a category or block level apply to every code below it.
O10 – Pre-existing hypertension complicating pregnancy, childbirth and the puerperium
- pre-existing hypertension with pre-existing proteinuria complicating pregnancy, childbirth and the puerperium
- pre-existing hypertension with superimposed pre-eclampsia complicating pregnancy, childbirth and the puerperium (O11.-)
Index terms for O10.91
Entries in the ICD-10-CM alphabetic index that lead to this code:
Related codes in O10.9
Frequently asked questions
What is ICD-10 code O10.91?
O10.91 is the ICD-10-CM code for unspecified pre-existing hypertension complicating pregnancy, in the block O10-O16 (Edema, proteinuria and hypertensive disorders in pregnancy, childbirth and the puerperium).
Is O10.91 a billable code?
No. O10.91 is a header code with more specific child codes; report one of the billable codes listed above.
What category does O10.91 belong to?
It belongs to category O10 – Pre-existing hypertension complicating pregnancy, childbirth and the puerperium.
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.