2026 ICD-10-CM Diagnosis Code I27.81Cor pulmonale (chronic)
ICD-10-CM Codes›I00–I99›I26-I28›I27
- Billable — Valid for Submission
- Risk Adjusts — HCC 226
- 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.
For Medicare Advantage risk adjustment, I27.81 maps to CMS-HCC Category 226 (Heart Failure, Except End Stage and Acute) under the V28 model, adding a risk factor of about 0.360 for a community, non-dual, aged beneficiary in payment year 2026.
Code Identity
Code Classification
Medicare Risk Adjustment (HCC)Billing
I27.81 maps to a payment category in the CMS-HCC model used to risk-adjust Medicare Advantage payments. Weights are the published community factors for payment year 2026.
Source: CMS Payment Year 2026 risk adjustment mappings and model software. Weights are relative factors, not dollar amounts; a beneficiary's total RAF also includes demographics and interactions. Browse all CMS-HCC categories.
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.
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
What is the ICD-10 code for cor pulmonale (chronic)?
The ICD-10-CM code for cor pulmonale (chronic) is I27.81 (sometimes written as I2781). It is billable on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
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.
What HCC is I27.81?
I27.81 (cor pulmonale (chronic)) maps to CMS-HCC Category 226 (Heart Failure, Except End Stage and Acute), commonly written as HCC 226, in the CMS-HCC V28 model used for Medicare Advantage risk adjustment in payment year 2026. It mapped to HCC 85 under the retired V24 model. It also maps in the PACE (CMS-HCC V22), ESRD (V21), and ESRD (V24) models. In the Part D prescription drug model it maps to RxHCC 184.
Does I27.81 risk-adjust for Medicare Advantage payment?
Yes. When documented and reported on a Medicare Advantage encounter, I27.81 adds a risk adjustment factor of about 0.360 to the beneficiary's RAF score for a community, non-dual, aged enrollee (published V28 weights range from 0.217 to 0.537 depending on the payment segment). A more severe related category (HCC 221, HCC 222, HCC 223, HCC 224, and HCC 225) supersedes it when both are reported. See the full factor table on the HCC 226 category page.
