ICD-10-CM Code I31.1

Chronic constrictive pericarditis

Version 2021 Billable Code

Valid for Submission

I31.1 is a billable code used to specify a medical diagnosis of chronic constrictive pericarditis. The code is valid for the fiscal year 2021 for the submission of HIPAA-covered transactions. The ICD-10-CM code I31.1 might also be used to specify conditions or terms like calcification of pericardium, chronic constrictive pericarditis, chronic pericarditis, constrictive pericarditis, constrictive pericarditis due to bacteria, constrictive pericarditis due to virus, etc

Short Description:Chronic constrictive pericarditis
Long Description:Chronic constrictive pericarditis

Tabular List of Diseases and Injuries

The Tabular List of Diseases and Injuries is a list of ICD-10 codes, organized "head to toe" into chapters and sections with guidance for inclusions, exclusions, descriptions and more. The following references are applicable to the code I31.1:

Inclusion Terms

Inclusion Terms
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.
  • Concretio cordis
  • Pericardial calcification

Index to Diseases and Injuries

The Index to Diseases and Injuries is an alphabetical listing of medical terms, with each term mapped to one or more ICD-10 code(s). The following references for the code I31.1 are found in the index:


The following clinical terms are approximate synonyms or lay terms that might be used to identify the correct diagnosis code:

  • Calcification of pericardium
  • Chronic constrictive pericarditis
  • Chronic pericarditis
  • Constrictive pericarditis
  • Constrictive pericarditis due to bacteria
  • Constrictive pericarditis due to virus
  • Fibrosis of pericardium
  • Fibrosis of pericardium
  • Fibrosis of pericardium
  • Fibrosis of pericardium
  • Fibrosis of pericardium
  • Infective constrictive pericarditis
  • Infective constrictive pericarditis
  • Mulibrey nanism syndrome
  • Pericarditis secondary to Mulibrey nanism
  • Subacute constrictive pericarditis
  • Subacute effusive constrictive pericarditis
  • Subacute pericarditis
  • Viral pericarditis

Diagnostic Related Groups

The ICD-10 code I31.1 is grouped in the following groups for version MS-DRG V38.0 What are Diagnostic Related Groups?
The Diagnostic Related Groups (DRGs) are a patient classification scheme which provides a means of relating the type of patients a hospital treats. The DRGs divides all possible principal diagnoses into mutually exclusive principal diagnosis areas referred to as Major Diagnostic Categories (MDC).
applicable from 10/01/2020 through 09/30/2021.


Convert I31.1 to ICD-9

  • 423.2 - Constrictiv pericarditis

Code Classification

  • Diseases of the circulatory system (I00–I99)
    • Other forms of heart disease (I30-I52)
      • Other diseases of pericardium (I31)

Code History

  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016
    (First year ICD-10-CM implemented into the HIPAA code set)
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020
  • FY 2021 - No Change, effective from 10/1/2020 through 9/30/2021

Information for Patients

Pericardial Disorders

The pericardium is a membrane, or sac, that surrounds your heart. It holds the heart in place and helps it work properly. Problems with the pericardium include

  • Pericarditis - an inflammation of the sac. It can be from a virus or other infection, a heart attack, heart surgery, other medical conditions, injuries, and certain medicines.
  • Pericardial effusion - the buildup of fluid in the sac
  • Cardiac tamponade - a serious problem in which buildup of fluid in the sac causes problems with the function of the heart

Symptoms of pericardial problems include chest pain, rapid heartbeat, and difficulty breathing. Fever is a common symptom of acute pericarditis. Your doctor may use a physical exam, imaging tests, and heart tests to make a diagnosis. Treatment depends on the cause.

NIH: National Heart, Lung, and Blood Institute

  • Cardiac tamponade (Medical Encyclopedia)
  • Pericardiocentesis (Medical Encyclopedia)
  • Pericarditis (Medical Encyclopedia)
  • Pericarditis - after heart attack (Medical Encyclopedia)
  • Pericarditis - constrictive (Medical Encyclopedia)

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