I27 Other pulmonary heart diseases
The ICD-10-CM code for Other pulmonary heart diseases is I27 (FY2026). It is a non-billable category code — select a more specific code below for claims.
Classification
- Section
- I26-I28: Pulmonary heart disease and diseases of pulmonary circulation (I26-I28)
- Category I27
- 21 codes (17 billable)
- FY2026 Status
- Stable since FY2024
Official Coding Guidelines
Pulmonary Hypertension11) Pulmonary Hypertension Pulmonary hypertension is classified to category I27, Other pulmonary heart diseases. For secondary pulmonary hypertension (I27.1, I27.2-), code also any associated conditions or adverse effects of drugs or toxins. The sequencing is based on the reason for the encounter, except for adverse effects of drugs (See Section I.C.19.e.).
Presumed relationship due to Index term “with”The classification presumes a causal relationship between hypertension and heart involvement and between hypertension and kidney involvement, as the two conditions are linked by the term “with” in the Alphabetic Index. These conditions should be coded as related even in the absence of provider documentation explicitly linking them, unless the documentation clearly states the conditions are unrelated.
Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026