ICD-9 Diagnosis Code 420.91

Ac idiopath pericarditis

Diagnosis Code 420.91

ICD-9: 420.91
Short Description: Ac idiopath pericarditis
Long Description: Acute idiopathic pericarditis
This is the 2014 version of the ICD-9-CM diagnosis code 420.91

Code Classification
  • Diseases of the circulatory system (390–459)
    • Other forms of heart disease (420-429)
      • 420 Acute pericarditis

Information for Medical Professionals

Convert to ICD-10 Additional informationCallout TooltipGeneral Equivalence Map
The ICD-10 and ICD-9 GEMs are used to facilitate linking between the diagnosis codes in ICD-9-CM and the new ICD-10-CM code set. The GEMs are the raw material from which providers, health information vendors and payers can derive specific applied mappings to meet their needs.
  • I30.0 - Acute nonspecific idiopathic pericarditis

Index of Diseases and Injuries
References found for the code 420.91 in the Index of Diseases and Injuries:

    • Pericarditis (granular) (with decompensation) (with effusion) 423.9
      • acute (nonrheumatic) 420.90
        • benign 420.91
        • idiopathic 420.91
        • nonspecific 420.91
        • viral 420.91
      • idiopathic (acute) 420.91
      • nonspecific 420.91
      • viral (acute) 420.91

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
  • Electrocardiogram
  • Pericardial fluid culture
  • Pericardial fluid Gram stain
  • Pericardiocentesis
  • Pericarditis
  • Pericarditis - after heart attack
  • Pericarditis - constrictive

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