2027 ICD-10-CM Diagnosis Code I15Secondary hypertension

ICD-10-CM Codes›I00–I99›I10-I1A›I15

ICD-10-CM I15
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

I15 is a non-billable ICD-10-CM category code for secondary hypertension, so it cannot be submitted on claims. Use a more specific code from this category instead, such as I15.0, I15.1, I15.2, and I15.8.

Code Identity

ICD-10-CM Code
I15
Billable Status
No — Non-Billable Category
Code Describes
Secondary hypertension
Short Description
Secondary hypertension
Same as the full description in the CMS dataset.
Chapter
I10-I1A
Hypertensive diseases

Code Classification

ChapterI00–I99Diseases of the circulatory system
SectionI10-I1AHypertensive diseases
CategoryI15Secondary hypertension
This CodeI15Secondary hypertension

Specific Coding for Secondary hypertensionOverview

Non-specific codes like I15 require more characters. Use one of these billable codes instead:

  • Use I15.0 for Renovascular hypertension

  • Use I15.1 for Hypertension secondary to other renal disorders

  • Use I15.2 for Hypertension secondary to endocrine disorders

  • Use I15.8 for Other secondary hypertension

  • Use I15.9 for Secondary hypertension, unspecified

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to I15: its own notes plus those printed at block I10-I1A and Chapter 9. A note printed at a category, block or chapter applies to every code under it.

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

On I15 itself
  • postprocedural hypertension (I97.3)
From Block I10-I1A Hypertensive diseases applies to 18 codes
  • neonatal hypertension (P29.2)
  • primary pulmonary hypertension (I27.0)

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

On I15 itself
  • secondary hypertension involving vessels of brain (I60-I69)
  • secondary hypertension involving vessels of eye (H35.0-)
From Block I10-I1A Hypertensive diseases applies to 18 codes
  • hypertensive disease complicating pregnancy, childbirth and the puerperium (O10-O11, O13-O16)
From Chapter 9 (I00-I99) Diseases of the circulatory system applies to 1,433 codes
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
  • systemic connective tissue disorders (M30-M36)
  • transient cerebral ischemic attacks and related syndromes (G45.-)

Use Additional Code

Add a second code, after this one, to fully describe the condition.

From Block I10-I1A Hypertensive diseases applies to 18 codes
  • code to identify:
  • exposure to environmental tobacco smoke (Z77.22)
  • history of tobacco dependence (Z87.891)
  • occupational exposure to environmental tobacco smoke (Z57.31)
  • tobacco dependence (F17.-)
  • tobacco use (Z72.0)

Code Also

A second code may be needed to fully describe the condition; the note gives no sequencing direction.

  • underlying condition

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name I15, its category, or a range that includes it.

Applicable To 1

These notes mention I15.

  • O10.4 Pre-existing secondary hypertension complicating pregnancy, childbirth and the puerperium
    Any condition in I15 specified as a reason for obstetric care during pregnancy, childbirth or the puerperium

Excludes1 1

These codes carry an Excludes1 note naming I15: they are not reported together with it, unless the two conditions are unrelated.

  • I12 Hypertensive chronic kidney disease
    secondary hypertension (I15.-)

Code First 1

These codes say to code first a condition named in the note, and I15 is one of the conditions named.

  • I1A.0 Resistant hypertension
    secondary hypertension (I15.-)

Use Additional Code 3

These codes say to use an additional code from the note, and I15 is one of the codes named.

  • O10.4 Pre-existing secondary hypertension complicating pregnancy, childbirth and the puerperium
    code from I15 to identify the type of secondary hypertension
  • G31.84 Mild cognitive impairment of uncertain or unknown etiology
    hypertension (I10-I1A) names I10-I1A, which includes this code
  • Block I60-I69 Cerebrovascular diseases
    hypertension (I10-I1A) names I10-I1A, which includes this code

Code Also 3

These codes say I15 may also be needed to fully describe the condition. The note gives no sequencing direction.

  • I16 Hypertensive crisis
    any identified hypertensive disease (I10-I15, I1A) names I10-I15, which includes this code
  • Block I20-I25 Ischemic heart diseases
    the presence of hypertension (I10-I1A) names I10-I1A, which includes this code
  • Z15.3 Genetic susceptibility to kidney disease
    if applicable, hypertension (I10-I1A) names I10-I1A, which includes this code

Clinical InformationClinical

  • Secondary Hypertension

    high blood pressure caused by an underlying medical condition.

Patient EducationClinical

High Blood Pressure

Blood pressure is the force of your blood pushing against the walls of your arteries. Each time your heart beats, it pumps blood into the arteries. Your blood pressure is highest when your heart beats, pumping the blood. This is called systolic pressure. When your heart is at rest, between beats, your blood pressure falls.

The full article covers:

  • What is blood pressure?
  • How is high blood pressure diagnosed?
  • What are the different types of high blood pressure?
  • Why do I need to worry about high blood pressure?
  • What are the treatments for high blood pressure?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About I15Overview

What is the ICD-10 code for secondary hypertension?

I15 is the ICD-10-CM category for secondary hypertension, but it is a non-billable header: claims need a more specific code from this category, listed on this page.

Is I15 (Secondary hypertension) a billable code?

No. This is a category header that groups the codes for secondary hypertension, and headers cannot be submitted on claims. Claims for secondary hypertension need a more specific code from this category, such as I15.0, I15.1, and I15.2.

Can I15 be reported with I97.3?

Not as a rule. The Excludes1 note on I15 lists "postprocedural hypertension (I97.3)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).