Pre-existing hypertension with pre-eclampsia (O11) ICD-10-CM
The O11 code range covers pre-existing hypertension with pre-eclampsia with 7 ICD-10-CM diagnosis codes. 6 of them are billable and valid for claim submission in fiscal year 2027, and the category headers group them but cannot themselves be billed.
Includes
This note appears immediately under a three character code title to further define, or give examples of, the content of the category.
- conditions in O10
- pre-eclampsia superimposed pre-existing hypertension
Use Additional Code
The “use additional code” indicates that a secondary code could be used to further specify the patient’s condition. This note is not mandatory and is only used if enough information is available to assign an additional code.
- code from O10
Codes in the O11 Range 7 codes · 6 billable
- O11 Pre-existing hypertension with pre-eclampsiaNon-billable
- O11.1 Pre-existing hypertension with pre-eclampsia, first trimester
- O11.2 Pre-existing hypertension with pre-eclampsia, second trimester
- O11.3 Pre-existing hypertension with pre-eclampsia, third trimester
- O11.4 Pre-existing hypertension with pre-eclampsia, complicating childbirth
- O11.5 Pre-existing hypertension with pre-eclampsia, complicating the puerperium
- O11.9 Pre-existing hypertension with pre-eclampsia, unspecified trimester
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the O11 range.
Chronic Maternal Hypertension with Superimposed Preeclampsia
Chronic hypertension in association with preeclampsia.
About the O11 Code Range
Pre-eclampsia occurs with high blood pressure that was already present. O11 describes this combination during pregnancy, childbirth, or the period after childbirth.
The subdivisions distinguish the first, second, and third trimesters (O11.1 through O11.3), childbirth (O11.4), and the period after childbirth (O11.5). O11.9 identifies an unspecified trimester.
Questions About This Page
How many billable codes are in the O11 range?
Of the 7 codes in this range, 6 are billable and valid for claim submission from October 1, 2026 through September 30, 2027. Category header codes group them but cannot be reported on claims.
What does the O11 range classify?
The range classifies pre-existing hypertension with pre-eclampsia. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2027 ICD-10-CM Tabular List and order file, effective October 1, 2026 through September 30, 2027.
