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    v1.0.28
    OpenPayerBilling CodesHypertensive diseasesICD-10-CM i10-essential-primary-hypertension
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    ICD-10-CM Code For Essential (Primary) Hypertension: Group Overview

    The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group I10 includes diagnoses for essential or primary hypertension, covering sustained high blood pressure without a documented secondary cause and related clinical descriptors. These ICD-10-CM diagnosis codes are used to document patient encounters for management of chronic elevated arterial blood pressure, medication management, and monitoring for hypertensive complications. Accurate coding within the ICD-10-CM I10 group supports proper claim adjudication.

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    ICD-10-CM I10: Essential (primary) Hypertension Overview

    The diagnoses in this group represent essential or primary hypertension, a chronic condition characterized by persistently elevated arterial blood pressure affecting the cardiovascular system. These codes target the diagnosis of elevated blood pressure without identifiable secondary causes and are used across inpatient and outpatient clinical settings. Accurate coding ensures diagnoses are reflected in the medical record and supports appropriate reimbursement through clear documentation.

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    When to Use

    Use a code from this group when a clinician documents essential or primary hypertension as the diagnosis for the encounter. Codes are appropriate for visits involving diagnosis, ongoing management, or monitoring of chronic high blood pressure when no secondary etiology is identified.

    ICD-10-CM Codes

    1 rows

    ICD-10-CM CodeDescription
    I10Essential (primary) hypertension

    DRG Codes

    2 rows

    DRG CodeDescription
    304Hypertension with MCC
    305Hypertension without MCC

    Typical Clinical Scenarios

    • An adult patient with routine primary care follow-up for long-standing hypertension presents for blood pressure management; vitals show persistent elevated readings despite adherence to antihypertensive medication, and no end-organ damage is identified on exam or labs. A diagnosis from this group is assigned to document the primary chronic diagnosis driving outpatient management and medication adjustments. Typical codes: I10
    • An older patient is admitted for an unrelated elective orthopedic procedure and preoperative evaluation reveals elevated blood pressure without symptoms or evidence of secondary causes; the clinician documents known hypertension as a comorbid condition requiring perioperative monitoring. A code from this group is used to capture the comorbid chronic hypertensive condition impacting perioperative care. Typical codes: I10
    • A middle-aged patient presents to the emergency department with severe headache and markedly high blood pressure readings but no acute target-organ injury on imaging or labs; after acute symptom management, the visit is attributed to hypertensive urgency rather than hypertensive emergency. A code from this group is assigned to record the essential hypertension contributing to the acute presentation. Typical codes: I10

    Related Codes

    I11-HYPERTENSIVE-HEART-DISEASE

    ICD-10-CM Code For Hypertensive Heart Disease: Group Overview

    I12-HYPERTENSIVE-CHRONIC-KIDNEY-DISEASE

    ICD-10-CM Code For Hypertensive Chronic Kidney Disease: Group Overview

    I13-HYPERTENSIVE-HEART-AND-CHRONIC-KIDNEY-DISEASE

    ICD-10-CM Code For Hypertensive Heart And Chronic Kidney Disease: Group Overview

    I15-SECONDARY-HYPERTENSION

    ICD-10-CM Code For Secondary Hypertension: Group Overview

    I16-HYPERTENSIVE-CRISIS

    ICD-10-CM Code For Hypertensive Crisis: Group Overview

    I1A-OTHER-HYPERTENSION

    ICD-10-CM Code For Other Hypertension: Group Overview

    Frequently Asked Questions

    References

    1. 1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
    2. 2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
    3. 3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.
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