O11
ICD-10Non-billable categoryPre-existing hypertension with pre-eclampsia
Official ICD-10-CM descriptor (FY2026)
Pre-existing hypertension with pre-eclampsia
O11 is a category heading, not a billable code. CMS does not accept it on a claim; report one of the more specific codes beneath it.
Includes
- conditions in O10 complicated by pre-eclampsia
- pre-eclampsia superimposed pre-existing hypertension
Use additional code
Report an additional code to identify the associated condition.
- code from O10 to identify the type of hypertension
More specific codes under O11
- O11.1Pre-existing hypertension w pre-eclampsia, first trimester
- O11.2Pre-existing hypertension w pre-eclampsia, second trimester
- O11.3Pre-existing hypertension w pre-eclampsia, third trimester
- O11.4Pre-existing htn with pre-eclampsia, comp childbirth
- O11.5Pre-existing htn with pre-eclampsia, comp the puerperium
- O11.9Pre-existing hypertension with pre-eclampsia, unsp trimester
Where this code sits
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ICD-10-CM FY2026. Centers for Medicare & Medicaid Services (CMS) / National Center for Health Statistics (NCHS), “2026 ICD-10-CM Code Descriptions in Tabular Order” (icd10cm_order_2026.txt). Download the original file from cms.gov. Public domain (US Government work). Descriptors, billable flags and instructional notes on this page are reproduced from that file without modification. Krasyn adds no clinical guidance.