ICD-10-CM · Circulatory system
ICD-10-CM · Circulatory systemI10: Essential (primary) hypertension
I10 is the ICD-10-CM code for Essential (primary) hypertension. Billable on U.S. claims with supporting documentation. Chapter: Circulatory system. Category: I10.
About this code
Essential (primary) hypertension.
I10 is an ICD-10-CM diagnosis code for essential (primary) hypertension. It sits in the 9. Circulatory system chapter of the U.S. clinical modification, under category I10.
This code is billable on U.S. healthcare claims when supported by appropriate clinical documentation. The patient chart must establish the diagnosis, capture any clinical detail encoded in the code (severity, laterality, encounter type, complications where applicable), and demonstrate medical necessity for the billed services.
Payer-specific coverage rules vary. Always cross-check against the current Local Coverage Determinations (LCDs) and National Coverage Determinations (NCDs) for the payer adjudicating the claim, plus any specialty-specific CMS Medicare Administrative Contractor guidance.
Billing context
What practitioners watch for on I10.
Code-specific billing guidance for I10, written from production billing experience.
Documentation
Essential (primary) hypertension without specified end-organ involvement. If hypertensive heart disease, hypertensive chronic kidney disease, or hypertensive heart and kidney disease is documented, use the appropriate I11, I12, or I13 combination code instead.
Common denial categories
- CO-16: Documentation does not support primary hypertension as separate vs combination diagnosis. Review chart for end-organ involvement; recode to I11.x, I12.x, or I13.x where supported.
Coverage signal
Cardiovascular coverage is broad. Cardiac procedures (cath, ablation, device implant) carry strict prior-auth requirements per payer.
Common specialties
Cardiology · Family Medicine · Internal Medicine
Companion CPT codes
Procedures commonly billed alongside I10 based on Medonix client production data and CMS coding guidance.
- 99214Office visit, established, moderate complexity
- 9300012-lead ECG with interpretation
- 93306Echocardiogram, complete with Doppler
- 80061Lipid panel
CPT is a registered trademark of the American Medical Association. Codes shown for educational reference only.
Sources
Where this entry comes from.
- NLM Clinical Tables Search Service: the official U.S. National Library of Medicine API for ICD-10-CM lookup.
- CDC National Center for Health Statistics: annual ICD-10-CM Tabular List release with effective date October 1.
- CMS Medicare Coverage Database: Local Coverage Determinations and National Coverage Determinations for payer-specific rules.
Frequently asked
About ICD-10 code I10.
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