DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

I1A Other hypertension

  • Header · not billable

I1A is not billable. The category heads 1 billable code in FY2027: the one code directly below it.

ICD-10 code by name

What is the ICD-10 code for resistant hypertension?
Resistant hypertension ICD-10 code: I1A.0 Resistant hypertension. Search ICD-10 for resistant hypertension

Where it sits

  1. Chapter 9 Diseases of the circulatory system (I00-I99)
  2. I10-I1A Hypertensive diseases (I10-I1A)
  3. I1A Other hypertension
Billable codes
1
Subdivisions
1
CC / MCC codes
0 / 0
HCC V28 codes
0
New FY2027
0
Index entries
1

Codes in I1A

  1. I1A.0
    Resistant hypertension
    Billable
    Inclusion terms 3, Code first 3

    Inclusion terms

    • Apparent treatment resistant hypertension
    • Treatment resistant hypertension
    • True resistant hypertension

    Code first

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

Sources of each column.

Instructions

Notes that also apply

Block I10-I1A instructions (Excludes1 2, Excludes2 1, Use additional code 6): printed on the block page.

Chapter 9 instructions (Excludes2 10): printed on the chapter 9 page.

Index entries

  • Hypertension, hypertensive (accelerated) (benign) (essential) (idiopathic) (malignant) (systemic)resistant (apparent treatment) (treatment) (true) → I1A.0

NCHS Alphabetic Index. Index first, then the Tabular List.

Hierarchy