I1A.0

Billable

ChapterI00–I99

Ranksubcategory

Official Description

Resistant hypertension

Metadata & Insights

•2026 ICD-10-CM Edition - Effective October 1, 2025.
•Billable/specific code (valid for reimbursement).
•Chapter 9: Diseases of the Circulatory System (I00-I99).

Instructional Notes

Includes

Apparent treatment resistant hypertension
Treatment resistant hypertension
True resistant hypertension

Code First

specific type of existing hypertension, if known, such as:
essential hypertension (I10)
secondary hypertension (I15.-)

General instructions are available for the parent sections:

View CH9 Notes View I10-I1A Notes

Clinical Hierarchy

CH9Diseases of the circulatory system (I00-I99)

I10-I1AHypertensive diseases (I10-I1A)

I1AOther hypertension

I1A.0Resistant hypertension

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to I1A.0:

blockI10-I1A

Hypertensive diseases (I10-I1A)

View context instructions

chapterCH9

Diseases of the circulatory system (I00-I99)

View context instructions

Alphabetic Index Mentions

These are Diagnosis Index lookup paths that route to I1A.0. Use them as entry terms for search, then confirm final coding instructions in the Tabular List and notes above.

1 raw paths

Hypertension, hypertensive (accelerated) (benign) (essential) (idiopathic) (malignant) (systemic)1 unique routes

resistant (apparent treatment) (treatment) (true)→I1A.0

MS-DRG Classification

2026 v43.1

This code is grouped within the following Diagnosis Related Group(s) for clinical reimbursement:

DRG 304

Hypertension with MCC

DRG 305

Hypertension without MCC

Cross Reference

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