I10

Billable

Essential (primary) hypertension

HCC Category Mapping

RxHCCHCC 187 — Hypertension

0.000

What This Code Means

High blood pressure that develops without an identifiable secondary cause, also known as primary hypertension. This is the most common type of high blood pressure.

Coding Tips

•I10 is used when hypertension is documented without mention of heart disease, kidney disease, or secondary causes
•Do not use I10 if the hypertension is secondary to another condition; instead use the appropriate I11-I15 code

Clinical Significance

Essential hypertension is one of the most prevalent chronic conditions in the United States, serving as a major risk factor for cardiovascular disease, stroke, chronic kidney disease, and heart failure. While it does not map to a CMS-HCC category, it is a critical comorbidity that influences treatment complexity and is foundational for many combination codes involving hypertensive heart and kidney disease.

Documentation Requirements

✓Provider documentation of hypertension diagnosis (not just an elevated blood pressure reading)
✓Current blood pressure reading
✓Assessment of whether hypertension is controlled or uncontrolled
✓Current antihypertensive medication regimen
✓Evaluation for end-organ damage (cardiac, renal, cerebrovascular)
✓If heart disease or chronic kidney disease is present, document whether the conditions are related to hypertension

Includes

high blood pressure
hypertension (arterial) (benign) (essential) (malignant) (primary) (systemic)

Excludes 1 — Do NOT code together

hypertensive disease complicating pregnancy, childbirth and the puerperium (O10-O11, O13-O16)

Excludes 2 — Not included here, may code separately

essential (primary) hypertension involving vessels of brain (I60-I69)
essential (primary) hypertension involving vessels of eye (H35.0-)

Commonly Confused Codes

I11.0 — Hypertensive heart disease with heart failure (use when hypertension and heart failure coexist — per ICD-10 guidelines, a causal relationship is assumed)I11.9 — Hypertensive heart disease without heart failure (use when hypertension coexists with heart disease)I12.0 / I12.9 — Hypertensive chronic kidney disease (use when hypertension and CKD coexist — causal relationship is assumed)I13.x — Hypertensive heart and chronic kidney disease (use when all three conditions coexist)I15.x — Secondary hypertension (use when hypertension has an identifiable cause)R03.0 — Elevated blood pressure reading (use for an incidental finding, not a diagnosis of hypertension)

Code Hierarchy

└I10Essential (primary) hypertension

I10