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I10 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. The 2026 edition of ICD-10-CM I10 became effective on . This is the American ICD-10-CM version of I10 - other international versions of ICD-10 I10 may differ.
Understanding the Context
I10 is a valid billable ICD-10 diagnosis code for Essential (primary) hypertension. It is found in the 2025 version of the ICD-10 Clinical Modification (CM) and can be used in all HIPAA-covered transactions from - . Accurately coding this diagnosis is fundamental for clinical documentation, quality reporting, risk adjustment, and, critically, medical billing and reimbursement. The primary code for the most common type of hypertension is ICD-10-CM code I10: Essential (primary) hypertension.
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Key Insights
ICD-10-CM medical diagnosis code groups for recording and documenting medical diagnosis. Codes in the I10 group. Code I10 is the diagnosis code used for Essential (Primary) Hypertension. It is a disorder characterized by a pathological increase in blood pressure. Patients with hypertension may also be at risk for I25 – Chronic Ischemic Heart Disease or I50.9 – Heart Failure, especially if left unmanaged.
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I10 is a billable diagnosis code used to specify a medical diagnosis of essential (primary) hypertension. The code is valid during the current fiscal year for the submission of HIPAA-covered transactions from through . Get crucial instructions for accurate ICD-10-CM I10 coding with all applicable Excludes 1 and Excludes 2 notes from the section level conveniently shown with each code. This section shows you chapter-specific coding guidelines to increase your understanding and correct usage of the target ICD-10-CM Volume 1 code. ICD code I10 is used to identify essential hypertension, a common condition characterized by high blood pressure with no known cause.