Pre-existing hypertension complicating pregnancy, childbirth and the puerperium (O10) ICD-10-CM
The O10 code range covers pre-existing hypertension complicating pregnancy, childbirth and the puerperium with 49 ICD-10-CM diagnosis codes. 36 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.
- pre-existing hypertension with pre-existing proteinuria complicating pregnancy, childbirth and the puerperium
Type 2 Excludes
A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.
- pre-existing hypertension with superimposed pre-eclampsia complicating pregnancy, childbirth and the puerperium O11
Codes in the O10 Range 49 codes · 36 billable
- O10 Pre-existing hypertension complicating pregnancy, childbirth and the puerperiumNon-billable
- O10.0 Pre-existing essential hypertension complicating pregnancy, childbirth and the puerperiumNon-billable
- O10.01 Pre-existing essential hypertension complicating pregnancyNon-billable
- O10.011 Pre-existing essential hypertension complicating pregnancy, first trimester
- O10.012 Pre-existing essential hypertension complicating pregnancy, second trimester
- O10.013 Pre-existing essential hypertension complicating pregnancy, third trimester
- O10.019 Pre-existing essential hypertension complicating pregnancy, unspecified trimester
- O10.02 Pre-existing essential hypertension complicating childbirth
- O10.03 Pre-existing essential hypertension complicating the puerperium
- O10.1 Pre-existing hypertensive heart disease complicating pregnancy, childbirth and the puerperiumNon-billable
- O10.11 Pre-existing hypertensive heart disease complicating pregnancyNon-billable
- O10.111 Pre-existing hypertensive heart disease complicating pregnancy, first trimester
- O10.112 Pre-existing hypertensive heart disease complicating pregnancy, second trimester
- O10.113 Pre-existing hypertensive heart disease complicating pregnancy, third trimester
- O10.119 Pre-existing hypertensive heart disease complicating pregnancy, unspecified trimester
- O10.12 Pre-existing hypertensive heart disease complicating childbirth
- O10.13 Pre-existing hypertensive heart disease complicating the puerperium
- O10.2 Pre-existing hypertensive chronic kidney disease complicating pregnancy, childbirth and the puerperiumNon-billable
- O10.21 Pre-existing hypertensive chronic kidney disease complicating pregnancyNon-billable
- O10.211 Pre-existing hypertensive chronic kidney disease complicating pregnancy, first trimester
- O10.212 Pre-existing hypertensive chronic kidney disease complicating pregnancy, second trimester
- O10.213 Pre-existing hypertensive chronic kidney disease complicating pregnancy, third trimester
- O10.219 Pre-existing hypertensive chronic kidney disease complicating pregnancy, unspecified trimester
- O10.22 Pre-existing hypertensive chronic kidney disease complicating childbirth
- O10.23 Pre-existing hypertensive chronic kidney disease complicating the puerperium
- O10.3 Pre-existing hypertensive heart and chronic kidney disease complicating pregnancy, childbirth and the puerperiumNon-billable
- O10.31 Pre-existing hypertensive heart and chronic kidney disease complicating pregnancyNon-billable
- O10.311 Pre-existing hypertensive heart and chronic kidney disease complicating pregnancy, first trimester
- O10.312 Pre-existing hypertensive heart and chronic kidney disease complicating pregnancy, second trimester
- O10.313 Pre-existing hypertensive heart and chronic kidney disease complicating pregnancy, third trimester
- O10.319 Pre-existing hypertensive heart and chronic kidney disease complicating pregnancy, unspecified trimester
- O10.32 Pre-existing hypertensive heart and chronic kidney disease complicating childbirth
- O10.33 Pre-existing hypertensive heart and chronic kidney disease complicating the puerperium
- O10.4 Pre-existing secondary hypertension complicating pregnancy, childbirth and the puerperiumNon-billable
- O10.41 Pre-existing secondary hypertension complicating pregnancyNon-billable
- O10.411 Pre-existing secondary hypertension complicating pregnancy, first trimester
- O10.412 Pre-existing secondary hypertension complicating pregnancy, second trimester
- O10.413 Pre-existing secondary hypertension complicating pregnancy, third trimester
- O10.419 Pre-existing secondary hypertension complicating pregnancy, unspecified trimester
- O10.42 Pre-existing secondary hypertension complicating childbirth
- O10.43 Pre-existing secondary hypertension complicating the puerperium
- O10.9 Unspecified pre-existing hypertension complicating pregnancy, childbirth and the puerperiumNon-billable
- O10.91 Unspecified pre-existing hypertension complicating pregnancyNon-billable
- O10.911 Unspecified pre-existing hypertension complicating pregnancy, first trimester
- O10.912 Unspecified pre-existing hypertension complicating pregnancy, second trimester
- O10.913 Unspecified pre-existing hypertension complicating pregnancy, third trimester
- O10.919 Unspecified pre-existing hypertension complicating pregnancy, unspecified trimester
- O10.92 Unspecified pre-existing hypertension complicating childbirth
- O10.93 Unspecified pre-existing hypertension complicating the puerperium
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the O10 range.
Chronic Maternal Hypertension
Hypertension that predates pregnancy.
About the O10 Code Range
High blood pressure that existed before pregnancy can complicate pregnancy, childbirth, or the period after childbirth.
O10 separates essential hypertension, hypertensive heart disease, hypertensive chronic kidney disease, and heart and kidney disease together. It also has subdivisions for secondary hypertension and for cases where the type of high blood pressure is unspecified.
Within each type, the codes distinguish pregnancy, childbirth, and the period after childbirth. Pregnancy codes further distinguish the first, second, third, or unspecified trimester.
Questions About This Page
How many billable codes are in the O10 range?
Of the 49 codes in this range, 36 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 O10 range classify?
The range classifies pre-existing hypertension complicating pregnancy, childbirth and the puerperium. 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.
