Complete guide to ICD-10-CM hypertension codes for 2026. Covers I10 essential hypertension, hypertensive heart disease (I11), hypertensive CKD (I12), combination codes, secondary hypertension, and sequencing rules.
Hypertension is one of the most prevalent chronic conditions coded in healthcare today, affecting nearly half of all American adults. Accurate hypertension coding is critical for quality reporting, chronic disease management, and risk adjustment under Medicare Advantage.
In ICD-10-CM, hypertension codes are found primarily in category I10-I16. Unlike ICD-9-CM which distinguished between essential, malignant, and benign hypertension, ICD-10-CM uses a single code — I10 — for essential (primary) hypertension in most cases, with additional codes required when hypertension involves the heart, kidneys, or both.
Key change from ICD-9: ICD-10-CM presumes a causal relationship between hypertension and hypertensive heart disease and hypertensive chronic kidney disease. You no longer need physician documentation of a causal relationship for these combinations.
| Code | Description | Notes |
|---|---|---|
| I10 | Essential (primary) hypertension | Most common — use when no heart or kidney involvement documented |
| I11.0 | Hypertensive heart disease with heart failure | Add heart failure type code (I50.-) |
| I11.9 | Hypertensive heart disease without heart failure | Use when HTN affects heart without failure |
| I12.9 | Hypertensive CKD with CKD stage 1-4 or unspecified | Add CKD stage code (N18.-) |
| I12.31 | Hypertensive CKD with CKD stage 5 | Add N18.5 or N18.6 |
| I13.10 | Hypertensive heart and CKD without heart failure, CKD 1-4 | Combination code — heart + kidney |
| I13.0 | Hypertensive heart and CKD with heart failure, CKD 1-4 | Most complex combination |
| I16.0 | Hypertensive urgency | Severely elevated BP without organ damage |
| I16.1 | Hypertensive emergency | Severely elevated BP with organ damage |
When a patient has both hypertension and heart disease, ICD-10-CM presumes the hypertension caused the heart disease unless the provider documents a different cause. This means you should code I11.- (hypertensive heart disease) rather than coding I10 and the heart condition separately.
When heart failure is present with hypertensive heart disease, you must add a code from I50.- to specify the type of heart failure:
ICD-10-CM also presumes a causal relationship between hypertension and CKD. When a patient has both conditions, use category I12.- and add the appropriate CKD stage code from N18.-.
The sequencing rule is important: the hypertensive CKD code (I12.-) is sequenced first, followed by the CKD stage code (N18.-).
Secondary hypertension (I15.-) is hypertension caused by an underlying condition such as renal artery stenosis, primary aldosteronism, or Cushing's syndrome. When coding secondary hypertension:
Do not code I10 with I11, I12, or I13: When a combination code for hypertensive heart disease or hypertensive CKD is used, you should not also code I10. The combination codes already include the hypertension.
Basic hypertension (I10) does not map to an HCC category. However hypertension with complications often drives associated conditions that do carry HCC weight. For example, hypertensive CKD progressing to stage 4 or 5 maps to HCC137 or HCC136 respectively with significant RAF score impact. Ensuring the full hypertension picture is coded — including associated heart and kidney involvement — is essential for accurate risk adjustment.
The information in this guide is based on official U.S. government publications. Always verify coding information against the most current official sources before use in billing or clinical documentation.
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