2025 ICD-10-CM Diagnosis Code I31.9

Disease of pericardium, unspecified

• I31.9 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
• The 2025 edition of ICD-10-CM I31.9 became effective on October 1, 2024.
• This is the American ICD-10-CM version of I31.9 – other international versions of ICD-10 I31.9 may differ.

Applicable To

• Pericarditis (chronic) NOS

The following code(s) above I31.9 contain annotation back-references

 that may be applicable to I31.9:

• I00-I99  Diseases of the circulatory system
• I31  Other diseases of pericardium

Approximate Synonyms

• Chest pain due to pericarditis
• Chronic pericarditis
• Constrictive pericarditis
• Pericardiomyopathy
• Pericarditis
• Pericarditis (inflammation of heart sac)
• Pericarditis pain (inflammation of heart sac)

Clinical Information

• 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. Treatment depends on the cause.

ICD-10-CM I31.9 is grouped within Diagnostic Related Group(s) (MS-DRG v42.0):

• 314 Other circulatory system diagnoses with mcc
• 315 Other circulatory system diagnoses with cc
• 316 Other circulatory system diagnoses without cc/mcc

Convert I31.9 to ICD-9-CMCode History

• 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
• 2017 (effective 10/1/2016): No change
• 2018 (effective 10/1/2017): No change
• 2019 (effective 10/1/2018): No change
• 2020 (effective 10/1/2019): No change
• 2021 (effective 10/1/2020): No change
• 2022 (effective 10/1/2021): No change
• 2023 (effective 10/1/2022): No change
• 2024 (effective 10/1/2023): No change
• 2025 (effective 10/1/2024): No change

Diagnosis Index entries containing back-references to I31.9:

• Pericarditis (with decompensation) (with effusion) I31.9
  • chronic (nonrheumatic) I31.9