ICD-10-CM 2027
ICD-10 code for pulmonale cor
From the official ICD-10-CM alphabetic index entry “Cor › pulmonale”. Page updated September 29, 2026.
About coding pulmonale cor
The ICD-10-CM code for pulmonale cor is I27.81 (Cor pulmonale (chronic)). The official index lists 4 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on I27.81.
Within I27.8 (other specified pulmonary heart diseases), I27.81 is specifically for cor pulmonale (chronic). Related codes cover chronic pulmonary embolism (I27.82), Eisenmenger's syndrome (I27.83), Fontan related circulation (I27.84) and other specified pulmonary heart diseases (I27.89).
Don't report I27.81 together with the conditions in its Excludes1 note: acute cor pulmonale (I26.0-).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
More specific pulmonale cor codes (official index)
Don't confuse with (Excludes1 for I27.81)
- acute cor pulmonale (I26.0-)
Common questions about pulmonale cor ICD-10 codes
What is the ICD-10 code for pulmonale cor?
- I27.81 — Cor pulmonale (chronic). More specific codes apply when the documentation supports them: I26.09, I27.81, I27.81, I27.82.
What is the ICD-10 code for acute pulmonale cor?
- I26.09 — Other pulmonary embolism with acute cor pulmonale.
What is the ICD-10 code for chronic pulmonale cor?
- I27.81 — Cor pulmonale (chronic).
Is I27.81 billable?
- Yes. I27.81 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can I27.81 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict I27.81 as a principal diagnosis.
Is I27.81 a CC or MCC?
- No. I27.81 is neither a CC nor an MCC under MS-DRG v44.0.