2026 ICD-10-CM Diagnosis Code I27.81Cor pulmonale (chronic)
ICD-10-CM Codes›I00–I99›I26-I28›I27
- Billable — Valid for Submission
- Chronic Condition
I27.81 is a billable ICD-10-CM diagnosis code for cor pulmonale (chronic). It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 314 through 316. Coders also document this condition as chronic cor pulmonale. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Pulmonary heart disease.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Chronic cor pulmonale
- Chronic right-sided heart failure
- Cor pulmonale
- Right ventricular failure due to pulmonary vascular disease
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Inclusion Terms
- Cor pulmonale NOS
Code Also
- , if applicable, right heart failure I50.81
Type 1 Excludes
- acute cor pulmonale I26.0
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
A "code also" note instructs that two codes may be required to fully describe a condition, but this note does not provide sequencing direction.
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
- Cor
- pulmonale - I27.81
- without pulmonary embolism - I27.81
- chronic - I27.81
- Pancake heart - R93.1
- with cor pulmonale (chronic) - I27.81
External Cause of Injuries IndexGuidance
References for this code in the External Cause of Injuries Index.
- Cor
- pulmonale
- Cor
- pulmonale
- acute
- without pulmonary embolism
- Cor
- pulmonale
- chronic
- Pancake heart
- with cor pulmonale (chronic)
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Pulmonary Hypertension
Pulmonary hypertension, sometimes called PH, is a serious condition that affects the blood vessels in the lungs. It develops when the blood pressure in your lungs is higher than normal.
The full article covers:
- What is pulmonary hypertension?
- What causes pulmonary hypertension?
- Who is more likely to develop pulmonary hypertension?
- What are the symptoms of pulmonary hypertension?
- What other problems can pulmonary hypertension cause?
- How is pulmonary hypertension diagnosed?
- What are the treatments for pulmonary hypertension?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert I27.81 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About I27.81Overview
Is I27.81 (Other specified pulmonary heart diseases) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report cor pulmonale (chronic) on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does I27.81 group to?
When cor pulmonale (chronic) is the principal diagnosis on an inpatient stay, it groups to MS-DRG 314, 315, 316, with relative weights from 0.6821 to 2.0852 depending on complications. Higher weights mean higher Medicare reimbursement.
What is the ICD-9 equivalent of I27.81?
Under the General Equivalence Mappings, cor pulmonale (chronic) converts to ICD-9-CM 416.9 (chr pulmon heart dis NOS). The mapping is approximate, so confirm the match fits the documentation.
Footnotes
[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:
- The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
- The condition places limitations on self-care, independent living, and social interactions.
