2026 ICD-10-CM Diagnosis Code I27Other pulmonary heart diseases

ICD-10-CM Codes›I00–I99›I26-I28›I27

ICD-10-CM I27
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

I27 is a non-billable ICD-10-CM category code for other pulmonary heart diseases, so it cannot be submitted on claims. Use a more specific code from this category instead, such as I27.0, I27.1, I27.20, and I27.21.

Code Identity

ICD-10-CM Code
I27
Billable Status
No — Non-Billable Category
Code Describes
Other pulmonary heart diseases
Chapter
I26-I28
Pulmonary heart disease and diseases of pulmonary circulation

Code Classification

ChapterI00–I99Diseases of the circulatory system
SectionI26-I28Pulmonary heart disease and diseases of pulmonary circulation
CategoryI27Other pulmonary heart diseases
This CodeI27Other pulmonary heart diseases

Specific Coding for Other pulmonary heart diseasesOverview

Non-specific codes like I27 require more characters. Use one of these billable codes instead:

  • Use I27.0 for Primary pulmonary hypertension

  • Use I27.1 for Kyphoscoliotic heart disease

  • I27.2 for Other secondary pulmonary hypertension

  • Use I27.20 for Pulmonary hypertension, unspecified

  • Use I27.21 for Secondary pulmonary arterial hypertension

  • Use I27.22 for Pulmonary hypertension due to left heart disease

  • Use I27.23 for Pulmonary hypertension due to lung diseases and hypoxia

  • Use I27.24 for Chronic thromboembolic pulmonary hypertension

  • Use I27.29 for Other secondary pulmonary hypertension

  • I27.8 for Other specified pulmonary heart diseases

  • Use I27.81 for Cor pulmonale (chronic)

  • Use I27.82 for Chronic pulmonary embolism

  • Use I27.83 for Eisenmenger's syndrome

  • I27.84 for Fontan related circulation

  • Use I27.89 for Other specified pulmonary heart diseases

  • Use I27.9 for Pulmonary heart disease, unspecified

Patient EducationClinical

Heart Diseases

Heart disease is a general term that includes many types of heart problems. It's a type of cardiovascular disease, which means heart and blood vessel disease.

The full article covers:

  • What is heart disease?
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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 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About I27Overview

Is I27 (Other pulmonary heart diseases) a billable code?

No. This is a category header that groups the codes for other pulmonary heart diseases, and headers cannot be submitted on claims. Claims for other pulmonary heart diseases need a more specific code from this category, such as I27.0, I27.1, and I27.20.