I10 — Essential (primary) hypertension

I10

ICD-10 Chapter 9: Circulatory System — illustrative image — Chapter 9: Diseases of the circulatory system (I00–I99) — illustrative image

What this code means

Essential (primary) hypertension is persistently raised blood pressure with no single identifiable cause, the commonest form.

Also called: hypertension, high blood pressure, essential hypertension.

When this code is used

Used for essential (primary) hypertension.

Where it sits in ICD-10-CM

Code I10 belongs to Chapter 9: Diseases of the circulatory system, which covers codes I00–I99 in the FY2027 ICD-10-CM tabular list. The official description above is copied verbatim from the CDC/NCHS FY2027 code file.

Learn more about this condition

Condition guide: Hypertension

Related symptoms

Headache

Related anatomy

Heart

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Frequently asked questions

What is ICD-10-CM code I10?

I10 is the ICD-10-CM diagnosis code for “Essential (primary) hypertension”. Essential (primary) hypertension is persistently raised blood pressure with no single identifiable cause, the commonest form.

When is code I10 used?

Used for essential (primary) hypertension. It belongs to Chapter 9 of ICD-10-CM (Diseases of the circulatory system).

This guide explains ICD-10-CM codes in plain language for patients, students and other readers. It is educational information only — not coding, billing or medical advice. The code recorded for any real encounter is assigned from the full clinical documentation by the treating team and qualified coders, and only they can decide which code fits a specific case.