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    v1.0.28
    OpenPayerBilling CodesHypertensive diseasesICD-10-CM i1a-other-hypertension
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    ICD-10-CM Code For Other Hypertension: Group Overview

    The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group I1A includes hypertensive conditions not classified elsewhere, covering miscellaneous forms of elevated blood pressure and related clinical presentations. These ICD-10-CM diagnosis codes are used to document clinical encounters involving nonprimary or atypical hypertension, capturing disease severity, organ involvement, or clinical complexity relevant to this group. Accurate coding within the ICD-10-CM I1A group supports proper claim adjudication, complete clinical documentation, and appropriate reimbursement.

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    ICD-10-CM I1A: Other Hypertension Overview

    The International Classification of Diseases, 10th Revision, Clinical Modification (ICD-10-CM I1A) code group Other hypertension represents hypertensive conditions not classified elsewhere, targeting the cardiovascular system and blood pressure disorders. These diagnoses capture forms of hypertension that do not fit into primary or secondary hypertension subgroups. Accurate coding ensures complete clinical documentation and supports appropriate reimbursement for services related to hypertensive management and complications.

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    When to Use

    Use a code from this group when the clinician documents hypertension that is not classified as primary essential hypertension or a defined secondary cause and no more specific hypertensive code applies. These codes apply during encounters for diagnosis, management, or monitoring of atypical or unspecified hypertensive conditions.

    ICD-10-CM Codes

    1 rows

    ICD-10-CM CodeDescription
    I1A.0Resistant hypertension

    DRG Codes

    2 rows

    DRG CodeDescription
    304Hypertension with MCC
    305Hypertension without MCC

    Typical Clinical Scenarios

    • An adult patient presents to primary care for routine follow-up with persistent elevated blood pressure readings that are not classified as primary (essential) hypertension after evaluation and documentation of secondary causes; the clinician documents a hypertensive condition attributable to other specified causes identified in the assessment, and assigns a code from this group to reflect that classification. Typical codes: I1A.0
    • An older patient hospitalized for a non-cardiovascular reason (e.g., infection) is found to have elevated blood pressure thought to be due to an identified secondary etiology rather than essential hypertension; the inpatient team documents the hypertensive disorder as a comorbid condition related to that other cause and records the appropriate code from this group on the problem list. Typical codes: I1A.0
    • A patient evaluated in the emergency department with acute symptomatic high blood pressure linked to a recognized secondary cause (for example, a hormonal or renal disorder determined during ED workup) where the diagnosis is recorded as hypertension due to that other cause; the ED encounter includes assignment of the applicable code from this group to capture the secondary hypertensive disease. Typical codes: I1A.0

    Related Codes

    I10-ESSENTIAL-PRIMARY-HYPERTENSION

    ICD-10-CM Code For Essential (Primary) Hypertension: Group Overview

    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

    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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