I10
ICD-10BillableEssential (primary) hypertension
Official ICD-10-CM descriptor (FY2026)
Essential (primary) hypertension
I10 is valid for submission on a claim: CMS flags it as a billable, specific code.
Plain-language explanation
The ICD-10-CM code for hypertension with no identified secondary cause. It is the most frequently reported diagnosis in outpatient care. Hypertension attributed to another condition is classified separately, in the I15 category.
Written by Krasyn as a general orientation to the code. It is not from CMS and is not clinical or coding advice.
Includes
- high blood pressure
- hypertension (arterial) (benign) (essential) (malignant) (primary) (systemic)
Excludes1
Not coded here. An Excludes1 code should never be reported at the same time as the code above it.
- hypertensive disease complicating pregnancy, childbirth and the puerperium (O10-O11, O13-O16)
Excludes2
Not included here. The condition is not part of this code, but a patient may have both, and both codes may be reported together.
- essential (primary) hypertension involving vessels of brain (I60-I69)
- essential (primary) hypertension involving vessels of eye (H35.0-)
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.