O11 — Pre-existing hypertension with pre-eclampsia
Is O11 billable?
No — O11 is a non-billable header code. O11 groups more specific codes and cannot be submitted on a claim. A valid ICD-10-CM code must be reported at the highest level of specificity available in its branch. Select one of the 6 billable codes beneath O11.
Billable codes under this header
- O11.1Pre-existing hypertension with pre-eclampsia, first trimester
- O11.2Pre-existing hypertension with pre-eclampsia, second trimester
- O11.3Pre-existing hypertension with pre-eclampsia, third trimester
- O11.4Pre-existing hypertension with pre-eclampsia, complicating childbirth
- O11.5Pre-existing hypertension with pre-eclampsia, complicating the puerperium
- O11.9Pre-existing hypertension with pre-eclampsia, unspecified trimester
O11 at a glance
| Code | O11 |
|---|---|
| Description | Pre-existing hypertension with pre-eclampsia |
| Billable | No — header code |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Use additional code
Report an additional code alongside O11 to fully describe the condition. O11 is sequenced first.
- code from O10 to identify the type of hypertension
Includes
Conditions classified to O11.
- conditions in O10 complicated by pre-eclampsia
- pre-eclampsia superimposed pre-existing hypertension
Excludes1 — never code together — inherited from Chapter 15
The conditions below can never be reported together with O11 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
- supervision of normal pregnancy (Z34.-)
Use additional code — inherited from Chapter 15
Report an additional code alongside O11 to fully describe the condition. O11 is sequenced first.
- code, if applicable, from category Z3A, Weeks of gestation, to identify the specific week of the pregnancy, if known.
Excludes2 — not included here — inherited from Chapter 15
The conditions below are not part of O11, but a patient may have both at the same time. When documentation supports it, O11 and the excluded code may both be reported.
What codes fall under O11? (6)
- O11.1Pre-existing hypertension with pre-eclampsia, first trimester
- O11.2Pre-existing hypertension with pre-eclampsia, second trimester
- O11.3Pre-existing hypertension with pre-eclampsia, third trimester
- O11.4Pre-existing hypertension with pre-eclampsia, complicating childbirth
- O11.5Pre-existing hypertension with pre-eclampsia, complicating the puerperium
- O11.9Pre-existing hypertension with pre-eclampsia, unspecified trimester
How long has O11 existed?
O11 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.
Which codes are confused with O11?
ICD-10-CM declares these codes mutually exclusive with O11 — exactly one of each pair can be correct for a given encounter.