Specific code 2014 ICD-9-CM Diagnosis Code 420.90
Acute pericarditis, unspecified
  • Billable Code
  • Short description: Acute pericarditis NOS.
  • ICD-9-CM 420.90 will be replaced by an equivalent ICD-10-CM code (or codes) when the United States transitions from ICD-9-CM to ICD-10-CM on October 1, 2015.
  • ICD-9-CM 420.90 is a billable medical code that can be used to specify a diagnosis on a reimbursement claim.
Disease Synonyms
  • Acute pericarditis
  • Acute pericarditis (inflammation of heart sac)
  • Pericarditis
  • Pericarditis (inflamed covering of heart)
  • Pericarditis, acute
Applies To
  • Pericarditis (acute):
    • NOS
    • infective NOS
    • sicca
Convert to ICD-10-CM: 420.90 converts approximately to:
  • 2014 ICD-10-CM I30.9 Acute pericarditis, unspecified
ICD-9-CM Volume 2 Index entries containing back-references to 420.90:
  • Chylopericardium (acute) 420.90
  • Effusion
    • pericardium, pericardial (see also Pericarditis) 423.9
      • acute 420.90
  • Mediastinopericarditis (see also Pericarditis) 423.9
    • acute 420.90
  • Pericarditis (granular) (with decompensation) (with effusion) 423.9
    • acute (nonrheumatic) 420.90
      • with chorea (acute) (rheumatic) (Sydenham's) 392.0
      • bacterial 420.99
      • benign 420.91
      • hemorrhagic 420.90
      • idiopathic 420.91
      • infective 420.90
      • nonspecific 420.91
      • rheumatic 391.0
        • with chorea (acute) (rheumatic) (Sydenham's) 392.0
      • sicca 420.90
      • viral 420.91
    • cholesterol (chronic) 423.8
      • acute 420.90
    • infective (acute) 420.90
    • neoplastic (chronic) 423.8
      • acute 420.90
  • Pleuropericarditis (see also Pericarditis) 423.9
    • acute 420.90
  • Pneumopericarditis (see also Pericarditis) 423.9
    • acute 420.90
ICD-9-CM codes are used in medical billing and coding to describe diseases, injuries, symptoms and conditions. ICD-9-CM 420.90 is one of thousands of ICD-9-CM codes used in healthcare. Although ICD-9-CM and CPT codes are largely numeric, they differ in that CPT codes describe medical procedures and services. Can't find a code? Start at the root of ICD-9-CM, check the 2014 ICD-9-CM Index or use the search engine at the top of this page to lookup any code.