ICD10BillableValid for clinical use
ICD-10 Code I10: Essential (primary) hypertension
Reviewed by HealthAssure Clinical TeamUpdated 26 May 2026
What is this code?
ICD-10 codes are diagnosis classification codes used in healthcare records, reporting, coding workflows, and billing support. This code sits within the broader ICD-10 area for Diseases of the circulatory system (I00-I99).
đź“‹Clinical overview
This ICD-10 code is commonly used when documentation describes elevated blood pressure or hypertensive disease. The most accurate code depends on whether the condition is primary, secondary, or linked with heart or kidney involvement.
When is it used?
- May be used when a clinician documents essential (primary) hypertension in a patient's medical record.
- May appear in hospital records, claims, referrals, and clinical documentation.
- This code can be used as a clinically usable diagnosis entry in standardized coding workflows.
What it does not mean
- A code alone does not explain severity, treatment plan, or outcome.
- A medical code should not be treated as a substitute for a doctor's diagnosis or advice.
đź©şClinical context
When commonly used
- Primary care, cardiology, nephrology, and pre-operative documentation where blood pressure disease is part of the active problem list.
- Chronic disease follow-up and risk-adjustment workflows where hypertension status affects longitudinal care planning.
Common workup
- Common related testing on this page includes Serum creatinine, Urine albumin creatinine ratio, Lipid profile.
- Related procedures or service context already linked on this page include Ambulatory blood pressure monitoring, Electrocardiogram (ECG).
Common management context
- Clinical follow-up often includes blood-pressure measurement, medication review, kidney-risk assessment, and cardiovascular risk management.
- Documentation becomes more specific when the chart links hypertension with heart failure, chronic kidney disease, or another secondary cause.
- Specialist context already linked on this page includes Cardiologist, General Physician.
🔍Key distinctions
Important notes
- ICD-10 hypertension coding is often broader than the actual treatment plan; the exact code depends on whether associated heart or kidney disease is documented.
- Secondary hypertension and hypertensive heart or kidney disease generally require more specific codes than uncomplicated essential hypertension.
- Essential or primary hypertension is coded differently from secondary hypertension or hypertension linked to documented heart or kidney disease.
Important exclusions
- hypertensive disease complicating pregnancy, childbirth and the puerperium (O10-O11, O13-O16)
- essential (primary) hypertension involving vessels of brain (I60-I69)
- essential (primary) hypertension involving vessels of eye (H35.0-)
Related codes to consider
I11Hypertensive heart disease
Related hypertension-family ICD-10 code; documentation often becomes more specific when heart, kidney, or secondary-cause detail is present.
I12Hypertensive chronic kidney disease
Related hypertension-family ICD-10 code; documentation often becomes more specific when heart, kidney, or secondary-cause detail is present.
I13Hypertensive heart and chronic kidney disease
Related hypertension-family ICD-10 code; documentation often becomes more specific when heart, kidney, or secondary-cause detail is present.
I15Secondary hypertension
Related hypertension-family ICD-10 code; documentation often becomes more specific when heart, kidney, or secondary-cause detail is present.
Code hierarchy
chapter
9Diseases of the circulatory system (I00-I99)
block
I10-I1AHypertensive diseases
currentI10-I1A
Official coding notes
Includes
- high blood pressure
- hypertension (arterial) (benign) (essential) (malignant) (primary) (systemic)
Excludes1 (do not code together)
- hypertensive disease complicating pregnancy, childbirth and the puerperium (O10-O11, O13-O16)
Excludes2 (may code together if documented)
- essential (primary) hypertension involving vessels of brain (I60-I69)
- essential (primary) hypertension involving vessels of eye (H35.0-)
Where you may see this code
You may see this code in hospital records, discharge summaries, insurance claims, encounter documentation, referrals, or other healthcare billing and coding records.
Related specialists
CardiologistGeneral Physician
Related tests
Serum creatinine
Commonly reviewed when assessing kidney function in hypertension care.
Urine albumin creatinine ratio
May help review kidney involvement associated with hypertension.
Lipid profile
Often reviewed as part of cardiovascular risk assessment.
Related procedures
Ambulatory blood pressure monitoring
May appear in hypertension evaluation and follow-up workflows.
Electrocardiogram (ECG)
Often part of broader cardiovascular evaluation in hypertension care.
Related codes
Sibling codes
Coverage-related procedures and services
CPT 83090high
HOMOCYSTEINE
Source: CMS coverage guidance
CPT 82172high
APOLIPOPROTEIN, EACH
Source: CMS coverage guidance
CPT 86141high
C-REACTIVE PROTEIN; HIGH SENSITIVITY (HSCRP)
Source: CMS coverage guidance
CPT 93975high
DUPLEX SCAN OF ARTERIAL INFLOW AND VENOUS OUTFLOW OF ABDOMINAL, PELVIC, SCROTAL CONTENTS AND/OR RETROPERITONEAL ORGANS; COMPLETE STUDY
Source: CMS coverage guidance
CPT 93976high
DUPLEX SCAN OF ARTERIAL INFLOW AND VENOUS OUTFLOW OF ABDOMINAL, PELVIC, SCROTAL CONTENTS AND/OR RETROPERITONEAL ORGANS; LIMITED STUDY
Source: CMS coverage guidance
CPT 83695high
LIPOPROTEIN (A)
Source: CMS coverage guidance
Mapped diagnoses and classifications
SNOMED_CT 1201005high
Benign essential hypertension
Source: SNOMED International ICD-10 map
SNOMED_CT 10725009high
Benign hypertension
Source: SNOMED International ICD-10 map
SNOMED_CT 48146000high
Diastolic hypertension
Source: SNOMED International ICD-10 map
SNOMED_CT 762463000high
Diastolic hypertension and systolic hypertension
Source: SNOMED International ICD-10 map
SNOMED_CT 59621000high
Essential hypertension
Source: SNOMED International ICD-10 map
SNOMED_CT 429198000high
Exertional hypertension
Source: SNOMED International ICD-10 map
Coding guidelines
Compatibility
Legacy and official ICD code match exactly.
Legacy codes
I10
Common synonyms
Essential (primary) hypertensionEssentialEssential primary hypertension
Frequently asked questions
About this content
This page is prepared by HealthAssure's clinical team using official coding standards from ICD-10. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.