Pulmonary heart disease and diseases of pulmonary circulation (I26-I28) ICD-10-CM
The I26–I28 section covers pulmonary heart disease and diseases of pulmonary circulation with 41 ICD-10-CM diagnosis codes, of which 33 are billable in fiscal year 2026. The section is organized into the 3 code ranges listed below.
Code Ranges in This Section 3 ranges · 41 codes
| Code Range | Title | Codes | Billable |
|---|---|---|---|
| I26 | Pulmonary embolism (I26) | 15 | 12 |
| I27 | Other pulmonary heart diseases (I27) | 21 | 17 |
| I28 | Other diseases of pulmonary vessels (I28) | 5 | 4 |
The info icon previews the code ranges inside each row and its instructional notations from the official Tabular List.
About the I26–I28 Code Range
ICD-10 codes I26-I28 classify conditions related to pulmonary heart disease and disorders of the pulmonary circulation, including pulmonary embolism, various forms of pulmonary hypertension, and diseases affecting pulmonary vessels. These codes specify conditions ranging from acute pulmonary embolism to chronic pulmonary hypertension and congenital or acquired pulmonary vessel abnormalities.
This range begins with I26, covering pulmonary embolism such as septic pulmonary embolism or saddle embolus, often specifying whether acute right heart strain (acute cor pulmonale) is present. The I27 codes describe other pulmonary heart diseases like primary pulmonary hypertension (also known as idiopathic or heritable pulmonary arterial hypertension), secondary pulmonary hypertension due to lung, heart or systemic causes, and chronic complications such as cor pulmonale. The range also includes Eisenmenger's syndrome and various other pulmonary hypertension types linked to conditions like lung disease or left heart disease. The final subset, I28, identifies other diseases of pulmonary vessels such as pulmonary artery aneurysms or arteriovenous fistulas. These detailed codes assist healthcare professionals and coders in accurately identifying pulmonary vascular and heart conditions for clinical, billing, and epidemiological purposes.
Questions About This Page
How many codes are in the I26-I28 range?
The I26-I28 range contains 41 ICD-10-CM diagnosis codes in FY 2026. 33 of them are billable, and the rest are category headers that organize the section.
What conditions does I26-I28 cover?
The range covers pulmonary heart disease and diseases of pulmonary circulation. The code ranges listed above break it into groups of related conditions, and each one links to its own page with the full code list.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
